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GMC Yukon XL 2000–2006

GMC Yukon XLModel years 2000–2006

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Common on this vehicle:LeakSteering effort changeNoiseReduced brakingParking brake

issueHydro-boost brake assist and power steering share one hydraulic supply (four campaigns)Remove

Record by record

19 records state a cause or a remedy. Each record is shown as short labels in the order fault → finding the cause → correction. Press a label to narrow to the records that state it.

Symptom

Component named as the cause

Work done

How it is said to have ended

  • result not stated5

A ribbon is as wide as the records that state both of its ends (only the commonest are drawn). A record that names several symptoms or components runs through each. Orange is records that say the fault came back or was not fixed. Results come from owners’ reports only; one that does not say is “result not stated”. None of this is a likelihood of a cause or a rate at which work succeeds.

Read the records one by one (16)

Known issuesHydro-boost brake assist and power steering share one hydraulic supply (four campaigns)16

  1. Recall2004–2005 GMC YUKON XL ・ 2005-08-02

    Bosch Hydro-Boost Brake Accumulator Crack Recall

    1. 1Fault

      • The hydraulic brake booster's pressure accumulator may crack and/or separate from the Hydro-Boost assembly in normal operation; if it separates with the hood open, fragments could injure people nearby.
      • The crack or fractured surface could let hydraulic fluid leak from the accumulator circuit of the booster, and the loss of fluid would increase steering and braking effort.

    2. 2Finding the cause

      Possible causes

      • The over-pressurization comes from a two-function valve (TFV) that does not open within its specified limits while the hydraulic fluid in the accumulator circuit expands as the booster is exposed to rising under-hood temperatures.

      Steps to confirm (in the document’s order)

      1. With the engine OFF, make at least five (5) high effort brake applies until the pedal feels hard.
      2. Turn the steering wheel to the steering lock (fully turned) position, hold for 1 to 2 seconds, then release; do this a total of 3 times.
      3. Install the inlet port adapter, CH 47950-2, into the booster supply port and slowly tighten it with a torque wrench to 16 N·m (12 lb ft).
      4. Install the accumulator pressure clamp, CH 47950-1, by sliding it over the accumulator so that it straddles the hydro-boost housing.
      5. If fluid comes out of the inlet port adapter at up to 65 N·m (48 lb ft) maximum torque on the clamp bolt, the hydro-boost booster assembly is OK.

    3. 3Correction

      Repair

      1. If no fluid is seen, complete Steps 19-27 and repeat Steps 1-18; if no fluid is visible in the second evaluation, replace the hydro-boost unit.
      2. After the test, reinstall the supply hose/tube to the booster and tighten to 28 N·m (21 lb ft).
      3. When the booster is replaced, install the 4 booster to bulkhead nuts and tighten them to 36 N·m (26 lb ft).

      Caution

      • The inspection uses the Hydro-Boost Checking Tool, CH 47950, shipped to each dealer.
      • After starting the engine, do not depress the brake pedal until instructed.
      • Incorrect installation of the fixture washer will damage the accumulator end.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The recall covers certain 2004 Chevrolet Kodiak and GMC TopKick; 2004-2005 Chevrolet Avalanche, Express, Silverado, Suburban; GMC Savana, Sierra, Yukon XL; and HUMMER H2 vehicles built within the listed VIN breakpoints.
    • Applies to：GM limited the recall to dealer stock vehicles and sold vehicles with less than 150 days in service.
    • Condition：The hydraulic brake booster's pressure accumulator may crack and/or separate from the Hydro-Boost assembly in normal operation; if it separates with the hood open, fragments could injure people nearby.
    • Condition：The crack or fractured surface could let hydraulic fluid leak from the accumulator circuit of the booster, and the loss of fluid would increase steering and braking effort.
    • Cause：The over-pressurization comes from a two-function valve (TFV) that does not open within its specified limits while the hydraulic fluid in the accumulator circuit expands as the booster is exposed to rising under-hood temperatures.
    • Caution：The inspection uses the Hydro-Boost Checking Tool, CH 47950, shipped to each dealer.
    • Confirm：With the engine OFF, make at least five (5) high effort brake applies until the pedal feels hard.
    • Caution：After starting the engine, do not depress the brake pedal until instructed.
    • Confirm：Turn the steering wheel to the steering lock (fully turned) position, hold for 1 to 2 seconds, then release; do this a total of 3 times.
    • Confirm：Install the inlet port adapter, CH 47950-2, into the booster supply port and slowly tighten it with a torque wrench to 16 N·m (12 lb ft).
    • Confirm：Install the accumulator pressure clamp, CH 47950-1, by sliding it over the accumulator so that it straddles the hydro-boost housing.
    • Caution：Incorrect installation of the fixture washer will damage the accumulator end.
    • Confirm：If fluid comes out of the inlet port adapter at up to 65 N·m (48 lb ft) maximum torque on the clamp bolt, the hydro-boost booster assembly is OK.
    • Repair：If no fluid is seen, complete Steps 19-27 and repeat Steps 1-18; if no fluid is visible in the second evaluation, replace the hydro-boost unit.
    • Repair：After the test, reinstall the supply hose/tube to the booster and tighten to 28 N·m (21 lb ft).
    • Repair：When the booster is replaced, install the 4 booster to bulkhead nuts and tighten them to 36 N·m (26 lb ft).
    Cause
    CERTAIN TRUCKS, SPORT UTILITY VEHICLES, AND VANS EQUIPPED WITH BOSCH HYDRO-BOOST BRAKE ASSEMBLIES, THE HYDRAULIC BRAKE BOOSTER PRESSURE ACCUMULATOR MAY CRACK AND SEPARATE FROM THE HYDRO-BOOST ASSEMBLY DURING NORMAL OPERATING CONDITIONS.
    Remedy
    DEALERS WILL TEST THE HYDRO-BOOST ASSEMBLY FOR FUNCTIONAL OPERATION OF THE TWO-FUNCTION VALVE. IF THE HYDRO-BOOST ASSEMBLY FAILS THE TEST, DEALERS WILL REPLACE THE ASSEMBLY FREE OF CHARGE. THE RECALL BEGAN ON MARCH 23, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438, GMC TRUCKS AT 1-866-996-9463 AND HUMMER AT 1-800-732-5493.
    Consequence
    IF A SEPARATION OCCURRED AND THE HOOD OF THE VEHICLE WERE OPEN, FRAGMENTS FROM THE ACCUMULATOR COULD CAUSE INJURY TO PEOPLE IN THE IMMEDIATE AREA. THE PRESENCE OF THIS CRACK OR FRACTURED SURFACE COULD ALLOW THE HYDRAULIC FLUID TO LEAK FROM THE ACCUMULATOR CIRCUIT OF THE BOOSTER ASSEMBLY. THE LOSS OF FLUID WOULD CAUSE INCREASED STEERING AND BRAKING EFFORT AND A CRASH MAY OCCUR WITHOUT PRIOR WARNING.

  2. Recall2000 GMC YUKON XL ・ 2005-07-01

    Hydraulic Pump Driveshaft Fracture Recall

    1. 1Fault

      • The driveshaft in the power steering hydraulic pump can fracture, which results in loss of hydraulic power assist for steering.
      • On vehicles with Hydro-Boost power brakes the same condition can also remove power assist for braking; an inoperative pump raises steering effort, and braking effort on Hydro-Boost vehicles, but the vehicle can still be steered and slowed.

    2. 2Finding the cause

      Possible causes

      • The pump supplier, Delphi-Saginaw Plant 3, had salvaged 45,000 rejected pump rotors by manually regrinding them from oversize dimensions to a thickness within tolerance.

    3. 3Correction

      Repair

      1. Dealers are to replace the power steering hydraulic pump.
      2. On EVO equipped pumps, lubricate the new o-ring seal taken from the replacement pump fitting with clean power steering fluid and install it in the correct groove in the EVO actuator.
      3. Tighten the EVO actuator assembly to 50 N·m (37 lb ft).
      4. Install the front mounting bolts and tighten them to 50 N·m (37 lb ft).
      5. Install the rear mounting nuts to the studs and tighten them to 50 N·m (37 lb ft).
      3 more points

      Parts

      • Pumps for CK models: 88963602 (CK w/L31/JB7 Pwr Brk Sys), 88963606 (CK w/JB8/JD7 Hydr Brk Sys), 88963609 (CK w/JF9 4-Whl Disc Brk Sys) and 26081016 (CK w/JH6 Hydr Brk Sys), 1 per vehicle.
      • Hydraulic power steering fluid, 89021184 (U.S.) or 89021186 (Canada), as required.

      Part numbers printed in the document

      The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

      Caution

      • Tools required for the CK procedure: J 25034-C pulley remover, J 25033-C pulley installer, J 43485 bleeder adapter and J 35555 Metal Mityvac.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The program covers certain 2000 model year 2500/3500 Series Chevrolet CK, Silverado, Suburban and Express and GMC Sierra, Yukon XL and Savana vehicles built within the listed VIN breakpoints.
    • Applies to：The defect notice names certain 2000 model year series 2500 and 3500 vehicles manufactured from May 1, 1999 through October 14, 1999.
    • Condition：The driveshaft in the power steering hydraulic pump can fracture, which results in loss of hydraulic power assist for steering.
    • Condition：On vehicles with Hydro-Boost power brakes the same condition can also remove power assist for braking; an inoperative pump raises steering effort, and braking effort on Hydro-Boost vehicles, but the vehicle can still be steered and slowed.
    • Cause：The pump supplier, Delphi-Saginaw Plant 3, had salvaged 45,000 rejected pump rotors by manually regrinding them from oversize dimensions to a thickness within tolerance.
    • Repair：Dealers are to replace the power steering hydraulic pump.
    • Parts：Pumps for CK models: 88963602 (CK w/L31/JB7 Pwr Brk Sys), 88963606 (CK w/JB8/JD7 Hydr Brk Sys), 88963609 (CK w/JF9 4-Whl Disc Brk Sys) and 26081016 (CK w/JH6 Hydr Brk Sys), 1 per vehicle.
    • Parts：Hydraulic power steering fluid, 89021184 (U.S.) or 89021186 (Canada), as required.
    • Caution：Tools required for the CK procedure: J 25034-C pulley remover, J 25033-C pulley installer, J 43485 bleeder adapter and J 35555 Metal Mityvac.
    • Repair：On EVO equipped pumps, lubricate the new o-ring seal taken from the replacement pump fitting with clean power steering fluid and install it in the correct groove in the EVO actuator.
    • Repair：Tighten the EVO actuator assembly to 50 N·m (37 lb ft).
    • Repair：Install the front mounting bolts and tighten them to 50 N·m (37 lb ft).
    • Repair：Install the rear mounting nuts to the studs and tighten them to 50 N·m (37 lb ft).
    • Repair：Install the pulley flush with 0.5 mm (0.020 in) play.
    • Repair：To bleed the system, apply a vacuum of 68 kPa (20 in Hg) maximum at the pump reservoir filler neck and wait 1 minute.
    • Repair：Start the engine, let it idle, and turn the steering wheel 180-360 degrees in both directions 5 times.
    Cause
    SOME PICKUP TRUCKS, VANS, AND SPORT UTILITY VEHICLES EQUIPPED WITH A HYDRAULIC PUMP DRIVESHAFT THAT CAN FRACTURE, RESULTING IN IMMEDIATE LOSS OF HYDRAULIC POWER STEERING ASSIST. ON CERTAIN VEHICLES EQUIPPED WITH HYDRO-BOOST POWER BRAKES, THE SAME CONDITION CAN RESULT IN LOSS OF POWER ASSIST FOR BRAKING AFTER THE RESERVE PRESSURE IS DEPLETED.
    Remedy
    DEALERS WILL REPLACE THE HYDRAULIC PUMP. THE CAMPAIGN BEGAN ON FEBRUARY 14, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 OR GMC AT 1-866-996-9463.
    Consequence
    AN INOPERATIVE PUMP CAN CAUSE INCREASED STEERING EFFORT, AND IN HYDRO-BOOST EQUIPPED VEHICLES ALSO INCREASED BRAKING EFFORT, BUT DOES NOT COMPLETELY ELIMINATE THE ABILITY TO STEER OR SLOW THE VEHICLE.

  3. Recall2003–2004 GMC YUKON XL ・ 2004-04-02

    Brake Hydro-Boost Housing Relief Valve Bore Recall

    1. 1Fault

      • The relief valve bore in the brake hydro-boost module may be out of specification, which could fracture the relief valve o-ring seal inside the module.
      • If the seal fractures, the driver may hear during braking an engine compartment noise like the one made when the steering wheel is turned to a full stop, and may feel slightly higher steering effort while braking and parking.
      • Under certain driving conditions a fractured seal may require slightly more brake pedal effort for the same deceleration, which could result in a crash without prior warning.

    2. 2Finding the cause

      Possible causes

      • Inspection found a machining error in the relief bore cavity of modules produced on one of the automated boring machines used for the base housing.

      Steps to confirm (in the document’s order)

      1. Look at the color of the relief valve: if it is metallic yellow or looks like brass, no further action is required.
      2. If a yellow, pink or white paint mark is visible, no further inspection or repair is required, and any stamped number is to be disregarded.
      3. With no paint marks and a stamped number 2, 3 or 4 visible, no further inspection or repair is required.
      4. If a stamped number 1 is visible on the machined surface, the relief valve must be replaced.

    3. 3Correction

      Repair

      1. With the ignition OFF, pump the brake pedal at least ten times.
      2. Unscrew the original relief valve from the hydraulic brake booster with the tool supplied with the new relief valve.
      3. Insert the new relief valve into the bore and tighten it to 17 N·m (13 lb ft).
      4. With the master cylinder mounted flush to the booster, install the nuts and tighten them to 33 N·m (24 lb ft).

      Parts

      • Part number 10398682, VALVE KIT, P/B BOOS CONT, quantity 1 per vehicle if required.

      Part numbers printed in the document

      The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

      Caution

      • Take care when working around the accumulator, which contains high-pressure compressed gas and hydraulic fluid.
      • Do not blow compressed air into the bore or flush the valve bore with commercially available cleaners; this could damage the booster or master cylinder.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The recall covers certain 2003 and 2004 model year Cadillac Escalade, Escalade EXT and Escalade ESV; Chevrolet Silverado, Avalanche, Suburban and Express; GMC Sierra, Yukon, Yukon XL and Savana; HUMMER H2; and 2004 model year Chevrolet Tahoe vehicles built within the listed VIN breakpoints.
    • Condition：The relief valve bore in the brake hydro-boost module may be out of specification, which could fracture the relief valve o-ring seal inside the module.
    • Condition：If the seal fractures, the driver may hear during braking an engine compartment noise like the one made when the steering wheel is turned to a full stop, and may feel slightly higher steering effort while braking and parking.
    • Condition：Under certain driving conditions a fractured seal may require slightly more brake pedal effort for the same deceleration, which could result in a crash without prior warning.
    • Cause：Inspection found a machining error in the relief bore cavity of modules produced on one of the automated boring machines used for the base housing.
    • Confirm：Look at the color of the relief valve: if it is metallic yellow or looks like brass, no further action is required.
    • Confirm：If a yellow, pink or white paint mark is visible, no further inspection or repair is required, and any stamped number is to be disregarded.
    • Confirm：With no paint marks and a stamped number 2, 3 or 4 visible, no further inspection or repair is required.
    • Confirm：If a stamped number 1 is visible on the machined surface, the relief valve must be replaced.
    • Caution：Take care when working around the accumulator, which contains high-pressure compressed gas and hydraulic fluid.
    • Repair：With the ignition OFF, pump the brake pedal at least ten times.
    • Repair：Unscrew the original relief valve from the hydraulic brake booster with the tool supplied with the new relief valve.
    • Caution：Do not blow compressed air into the bore or flush the valve bore with commercially available cleaners; this could damage the booster or master cylinder.
    • Repair：Insert the new relief valve into the bore and tighten it to 17 N·m (13 lb ft).
    • Repair：With the master cylinder mounted flush to the booster, install the nuts and tighten them to 33 N·m (24 lb ft).
    • Parts：Part number 10398682, VALVE KIT, P/B BOOS CONT, quantity 1 per vehicle if required.
    Cause
    CERTAIN SPORT UTILITY VEHICLES, PICKUP TRUCKS, AND PASSENGER VANS FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 135, ?PASSENGER CAR BRAKE SYSTEMS.? SOME OF THESE VEHICLES WERE PRODUCED WITH AN OUT-OF-SPECIFICATION BRAKE HYDRO-BOOST HOUSING RELIEF VALVE BORE.
    Remedy
    DEALERS ARE TO REPLACE THE HYDRO-BOOST RELIEF VALVE. THE RECALL BEGAN ON JUNE 18, 2004. OWNERS SHOULD CONTACT CADILLAC AT 1-866-982-2339; CHEVROLET AT 1-800-630-2438; GMC AT 1-866-996-9463; OR HUMMER AT 1-866-486-6376.
    Consequence
    CONSEQUENTLY, THE VALVE O-RING SEAL MAY FRACTURE. STEERING EFFORTS MAY BE SLIGHTLY INCREASED WHILE BRAKING OR PARKING. UNDER CERTAIN DRIVING CONDITIONS, A FRACTURED SEAL MAY REQUIRE A SLIGHT INCREASE IN THE APPLIED BRAKE PEDAL EFFORT TO ACHIEVE THE SAME VEHICLE DECELERATION RATE AS PRIOR TO THE SEAT FRACTURE.

  4. Recall2004–2005 GMC YUKON XL ・ 2005-02-15

    Hydraulic Brake Booster Pressure Accumulator Crack Recall

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      Not stated

      What the documents say to do

      Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

      Confirm

      • Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.

      Repair

      1. Dealers replace the hydro-boost relief valve.
      2. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.

      Caution

      • An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.
    Read the sentences of the record
    Cause
    On certain vehicles, the hydraulic brake booster's pressure accumulator may crack and/or separate from the Hydro-Boost assembly during normal vehicle operating conditions. If a separation occurred and the hood of the vehicle was open, fragments from the accumulator could cause injury to people in the immediate area. In addition, the presence of this crack or fractured surface could allow the hydraulic fluid to leak from the accumulator circuit of the booster assembly. The loss of fluid would cause increased steering and braking effort. Correction: Dealers will test and, if necessary, replace the Hydro-Boost assembly.

  5. Owner complaint2001 GMC YUKON XL ・ 2005-01-15

    Steering and brakes lost; pump shaft snapped during backing and sharp turning over rough ground

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    LOST STEERING AND BRAKES. (1 more)
    Cause
    SHAFT IN PUMP SNAPPED OFF INSIDE HOUSING.
    Remedy
    TOWED TO GM GARAGE AND NEW PUMP INSTALLED.

  6. Manufacturer communication2003–2006 GMC YUKON XL ・ 2018-06-11(3 earlier editions of this document folded here)

    Power steering pump and line replacement procedure

    1. 1Fault

      • In rare cases there is a lack of steering assist when stopped or during parking lot type maneuvers.
      • The condition goes away or greatly improves once the vehicle begins to move or is above parking lot speeds.

    2. 2Finding the cause

      Possible causes

      • The concern can be aggravated by worn tires, low tire air pressure, low power steering pump pressures, and tires larger than stock size.

      Steps to confirm (in the document’s order)

      1. Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.
      2. To tell whether a 670 gear box is fitted, inspect the mounting bolts that attach the stub shaft housing; a 670 gear box has only 3 mounting bolts.

    3. 3Correction

      Repair

      1. If a C/K 1500 Series vehicle is equipped with a 670 gear box, replacing it with a 680 gear box may increase the customer satisfaction.
      2. When replacing a 670 gear box with a 680 gear box, replace the power steering gear, union fitting and both inlet O-ring seals.

      Parts

      • Parts (C/K 1500 series only): 88965542 Power Steering Gear, 26025709 Union Fitting, 26001594 Inlet O-ring Seal.

      Part numbers printed in the document

      The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

      Caution

      • For C/K 1500 series vehicles, if diagnostics did not lead to any repair, the concern is a normal operating characteristic.
      • If the stub shaft housing has no mounting bolts or has 4 bolts, do not proceed with this bulletin; the vehicle does not have a 670 gear box.
      • It is recommended in all cases that the proper tire size and the maximum tire pressure are set to the manufacturer's specification on the door placard, especially for the front tires.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The model list names 2003-2006 GMC Yukon, Yukon Denali and Yukon XL.
    • Condition：In rare cases there is a lack of steering assist when stopped or during parking lot type maneuvers.
    • Condition：The condition goes away or greatly improves once the vehicle begins to move or is above parking lot speeds.
    • Cause：The concern can be aggravated by worn tires, low tire air pressure, low power steering pump pressures, and tires larger than stock size.
    • Confirm：Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.
    • Caution：For C/K 1500 series vehicles, if diagnostics did not lead to any repair, the concern is a normal operating characteristic.
    • Repair：If a C/K 1500 Series vehicle is equipped with a 670 gear box, replacing it with a 680 gear box may increase the customer satisfaction.
    • Confirm：To tell whether a 670 gear box is fitted, inspect the mounting bolts that attach the stub shaft housing; a 670 gear box has only 3 mounting bolts.
    • Caution：If the stub shaft housing has no mounting bolts or has 4 bolts, do not proceed with this bulletin; the vehicle does not have a 670 gear box.
    • Repair：When replacing a 670 gear box with a 680 gear box, replace the power steering gear, union fitting and both inlet O-ring seals.
    • Parts：Parts (C/K 1500 series only): 88965542 Power Steering Gear, 26025709 Union Fitting, 26001594 Inlet O-ring Seal.
    • Caution：It is recommended in all cases that the proper tire size and the maximum tire pressure are set to the manufacturer's specification on the door placard, especially for the front tires.

    Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

    Remedy
    This technical bulletin provides a procedure to replace the power steering pump and line to correct the customers concern of lack of steering assit when stopped or parking lot manuvers.

  7. Manufacturer communication2003–2006 GMC YUKON DENALI XL ・ 2012-08-07

    GM Power Steering Assist Concerns Diagnosis

    1. 1Fault

      Not stated

    2. 2Finding the cause

      Not stated

    3. 3Correction

      GENERAL MOTORS: DIAGNOSING POWER STEERING CONCERNS. IN RARE CASES, CUSTOMERS MAY COMMENT ON A LACK OF STEERING ASSIST WHEN STOPPED OR DURING PARKING LOT TYPE OF MANEUVERS. *JS UPDATED 09/02/14*LJ

      What the documents say to do

      Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

      Confirm

      • Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.

      Repair

      1. Dealers replace the hydro-boost relief valve.
      2. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.

      Caution

      • An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.
    Read the sentences of the record
    Remedy
    GENERAL MOTORS: DIAGNOSING POWER STEERING CONCERNS. IN RARE CASES, CUSTOMERS MAY COMMENT ON A LACK OF STEERING ASSIST WHEN STOPPED OR DURING PARKING LOT TYPE OF MANEUVERS. *JS UPDATED 09/02/14*LJ

  8. Owner complaint2004 GMC YUKON DENALI XL ・ 2012-04-30

    Fluid leaking from hydraulic brake booster and release valve, noise on startup

    1. 1Fault

    2. 2Finding the cause

    3. 3CorrectionNot repaired

      THE VEHICLE WAS NOT REPAIRED.

      What the documents say to do

      Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

      Confirm

      • Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.

      Repair

      1. Dealers replace the hydro-boost relief valve.
      2. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.

      Caution

      • An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.
    Read the sentences of the record
    Fault
    THE CONTACT STATED THAT FLUID WAS LEAKING FROM THE HYDRAULIC BRAKE BOOSTER AND THE RELEASE VALVE. (1 more)
    Remedy
    THE VEHICLE WAS NOT REPAIRED.
    Inspection
    THE CONTACT TOOK THE VEHICLE TO AN INDEPENDENT MECHANIC, WHO INSPECTED THE BRAKES AND INFORMED THE CONTACT THAT THE HYDRAULIC BRAKE BOOSTER AND THE RELEASE VALVE NEEDED TO BE REPLACED.

  9. Owner complaint2004 GMC YUKON XL ・ 2009-10-02

    Power steering pump shaft fracture and brake failure at 37,000 miles

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    THE POWER STEERING SHAFT IN THE PUMP BROKE WHILE DRIVING 30 MPH (= 48.3 km/h). (1 more)
    Remedy
    THE DEALER REPLACED THE POWER STEERING PUMP.

  10. Owner complaint2000 GMC YUKON XL ・ 2007-12-04

    Power steering loss while driving in 2000 Yukon XL

    1. 1Fault

    2. 2Finding the cause

      Not stated

    3. 3Correction

      Not stated

      What the documents say to do

      Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

      Confirm

      • Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.

      Repair

      1. Dealers replace the hydro-boost relief valve.
      2. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.

      Caution

      • An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.
    Read the sentences of the record
    Fault
    I WAS DRIVING MY YUKON XL 2000 WHEN ALL OF SUDDEN THE CAR LOST POWER STEERING.
    Inspection
    WHEN I TOOK THE CAR TO GM TO GET IT FIXED THEY INDICATED THAT FAILURE WAS EXACTLY WHAT WAS DESCRIBED IN THE REPORT 05V005000.
    Consequence
    I DID HURT MY NECK WHEN THIS PROBLEM OCCURRED TRYING TO CONTROL AND STEER THE CAR.

  11. Owner complaint2001 GMC YUKON XL ・ 2006-07-21

    Power steering pump binding and shaft detachment while driving

    1. 1Fault

      THE ROAD CONDITIONS WERE DRY AND BUMPY. (1 more)

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    THE ROAD CONDITIONS WERE DRY AND BUMPY. (1 more)
    Remedy
    THE POWER STEERING UNIT WAS REPLACED.
    Inspection
    THE VEHICLE WAS TOWED TO THE PRIVATE REPAIR SHOP WHERE THEY DETERMINED THAT THE SHAFT ON THE POWER STEERING UNIT HAD DETACHED.

  12. Owner complaint2000 GMC YUKON XL ・ 2005-06-08

    Power steering pump failed while driving in mountains

    1. 1Fault

      THE POWER STEERING PUMP FAILED WHILE DRIVING IN THE MOUNTAINS.

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    THE POWER STEERING PUMP FAILED WHILE DRIVING IN THE MOUNTAINS.
    Remedy
    THE DEALER REPLACED THE PUMP AND CHARGED $200.

  13. Owner complaint2001 GMC YUKON XL ・ 2004-02-10

    Power steering pump failure with immediate loss of assist

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      Not stated

      What the documents say to do

      Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

      Confirm

      • Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.

      Repair

      1. Dealers replace the hydro-boost relief valve.
      2. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.

      Caution

      • An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.
    Read the sentences of the record
    Fault
    POWER STEERING PUMP FAILURE  2001 YUKON XL. (3 more)
    Cause
    DEALER AND GM CONCLUDE THAT FAILURE WAS DUE TO COLD WEATHER.
    Inspection
    DEALER DETERMINED FAILURE TO BE A SHEARED SHAFT ON THE POWER STEERING PUMP, WHICH CAUSED IMMEDIATE LOSS OF POWER STEERING.

  14. Owner complaint2004 GMC YUKON XL 1500 ・ 2010-02-16

    Power steering pump internal shaft broke, causing loss of power steering and power brakes

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      Not stated

      What the documents say to do

      Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

      Confirm

      • Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.

      Repair

      1. Dealers replace the hydro-boost relief valve.
      2. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.

      Caution

      • An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.

  15. Owner complaint2004 GMC YUKON XL ・ 2009-06-11

    Leak from hydro-boost brake assembly

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      Not stated

      What the documents say to do

      Hydro-boost brake assist and power steering share one hydraulic supply (four campaigns)

      Confirm

      • Perform the "Power Steering System Test" found in SI and make any necessary repairs based on system diagnosis.

      Repair

      1. Dealers replace the hydro-boost relief valve.
      2. Dealers test the hydro-boost assembly for functional operation and replace it if it fails.

      Caution

      • An inoperative pump raises steering and braking effort but does not completely remove the ability to steer or slow the vehicle.
    Read the sentences of the record
    Inspection
    THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER FOR SERVICE AND A LEAK WAS DISCOVERED COMING FROM THE HYDRO-BOOST BRAKE ASSEMBLY.

  16. Owner complaint2000 GMC YUKON XL 1500 ・ 2009-02-25

    Power steering failed during 3-point turn on dirt road

    1. 1Fault

      MAKING 3-POINT TURN ON DIRT ROAD, POWER STEERING FAILED.

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    MAKING 3-POINT TURN ON DIRT ROAD, POWER STEERING FAILED.
    Inspection
    UPON INSPECTION AT REPAIR SHOP, FOUND THAT SHAFT ON POWER STEERING PUMP HAD FRACTURED.

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1 owner complaints have no classified sentences yet, so their causes and repairs are not picked out. Their text is in the list of records.