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GMC Yukon XL 2000–2006

GMC Yukon XLModel years 2000–2006

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remedyHydraulic PumpRemove

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2 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.

Component named as the cause

Work done

How it is said to have ended

  • says it was fixed1

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 (2)

Known issuesHydro-boost brake assist and power steering share one hydraulic supply (four campaigns)1

  1. 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.

POWER TRAIN1

  1. Owner complaint2000 GMC YUKON XL ・ 2005-07-28

    Loss of power steering and braking assist after towing

    1. 1Fault

      THEN REALIZED THAT ALL POWER ASSISTED BRAKING AND STEERING WAS GONE.

    2. 2Finding the cause

    3. 3Correction

    Read the sentences of the record
    Fault
    THEN REALIZED THAT ALL POWER ASSISTED BRAKING AND STEERING WAS GONE.
    Cause
    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."
    Outcome
    SINCE THE REPAIR, THE POWER STEERING AND BRAKING HAVE WORKED PROPERLY, EVEN IN TOWING.