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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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2 conditions added

Common on this vehicle:Warning lightNoiseLeakMisfire or rough idleVibration or shudderAir conditioning or heaterReduced brakingCorrosion or rust

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13 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

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 (6)

Known issuesTrailer brakes applied whenever headlamps or park lamps are on (brake controller jumper harness)1

  1. Manufacturer communication2000–2003 GMC YUKON ・ 2003-02-01

    Trailer brakes applied with lamps on / controller backlighting wrong: jumper harness differs for 2003

    1. 1Fault

      • With the headlamps or park lamps on, the trailer brakes are always applied, or the back lighting of the trailer brake controller illuminates only when the brakes are applied.

    2. 2Finding the cause

      Possible causes

      • The condition may be due to wiring changes in the vehicle electrical system for the 2003 model year.

      Steps to confirm (in the document’s order)

      1. Inspect the brake controller wiring harness jumper plugged into the vehicle relay block body, which is under the left side of the instrument panel near the left kick panel, behind a plastic cover.
      2. The 1999 through early 2003 jumper has a reddish/brown 6-way connector and a tag with the last four digits of the harness part number; a second design 2003 jumper may have a white plastic connector with part number 5418.

    3. 3Correction

      Repair

      1. When a brake controller with its jumper attached is moved from a 2001-02 vehicle to a 2003 vehicle, the jumper harness connector must be changed.
      2. To use a 12171982, 15366255 or 15086884 harness in a 2003 vehicle, switch the wires in cavities A and D.
      3. To use a 15085418 harness in a 1999-2002 vehicle, switch the wires in cavities A and D.

      Parts

      • The 2000 jumper harness is PN 15366255, with a pink/purple tag reading 6255.
      • The 2001-02 jumper is PN 15086884, with an orange tag reading 6884.
      • The 2003 jumper is PN 15085418, with an orange tag reading 5418.

      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.

    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The affected vehicles include the 2000-03 Chevrolet Suburban and Tahoe and GMC Yukon and Yukon XL.
    • Condition：With the headlamps or park lamps on, the trailer brakes are always applied, or the back lighting of the trailer brake controller illuminates only when the brakes are applied.
    • Cause：The condition may be due to wiring changes in the vehicle electrical system for the 2003 model year.
    • Confirm：Inspect the brake controller wiring harness jumper plugged into the vehicle relay block body, which is under the left side of the instrument panel near the left kick panel, behind a plastic cover.
    • Confirm：The 1999 through early 2003 jumper has a reddish/brown 6-way connector and a tag with the last four digits of the harness part number; a second design 2003 jumper may have a white plastic connector with part number 5418.
    • Parts：The 2000 jumper harness is PN 15366255, with a pink/purple tag reading 6255.
    • Parts：The 2001-02 jumper is PN 15086884, with an orange tag reading 6884.
    • Parts：The 2003 jumper is PN 15085418, with an orange tag reading 5418.
    • Repair：When a brake controller with its jumper attached is moved from a 2001-02 vehicle to a 2003 vehicle, the jumper harness connector must be changed.
    • Repair：To use a 12171982, 15366255 or 15086884 harness in a 2003 vehicle, switch the wires in cavities A and D.
    • Repair：To use a 15085418 harness in a 1999-2002 vehicle, switch the wires in cavities A and D.

    Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.

    Remedy
    Trailer Controller Information 2000-03 - Chevrolet Suburban, Tahoe - GMC Yukon, Yukon XL Some customers may comment that when the headlamps or park lamps are on, the brakes on the trailer are always applied, or that the back lighting for the trailer brake controller illuminates only when the brakes are applied. This condition may be due to wiring changes within the vehicle electrical system for the 2003 model year. Inspect the brake controller wiring harness jumper that is plugged into the vehicle relay block body. The relay block body is located under the left side of the instrument panel near the left kick panel, behind a plastic cover. The 1999 through early 2003 wiring harness jumper that plugs into the relay block will have a reddish/brown 6-way connector and a tag with the last four digits of the wiring harness part number. Second design 2003 may have a white plastic connector with part number 5418 as well. - The 2000 jumper harness is PN 15366255. The pink/purple tag identifier is 6255. - the 2001-02 jumper is PN 15086884. The orange tag identifier is 6884. - The 2003 jumper is PN 15085418. The orange tag identifier is 5418. When transferring the brake controller with the wiring jumper attached from a 2001-02 vehicle to a 2003 vehicle, a change to the jumper harness connector must be performed. To modify a 12171982, 15366255 or 15086884 harness for use in a 2003 vehicle, switch the wires in cavities A and D. To modify a 15085418 harness for use in a 1999-2002 vehicle, switch the wires in cavities A and D

Known issuesTurn signal flashes fast (export flasher relay installed)1

  1. Manufacturer communication2000–2002 GMC FULL SIZE PICKUP OR UTILITY MODEL (YUKON) ・ 2002-02-01

    Turn signal flashes fast: export flasher relay installed

    1. 1Fault

    2. 2Finding the cause

      Possible causes

      • It is possible that an Export relay was installed into the vehicle.

      Steps to confirm (in the document’s order)

      • Inspect the part and part number.

    3. 3Correction

      Repair

      • Use part number 12450072 to fix this concern.

      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.

      Parts

      • Part number 11516051, for RPO option T79 (lamps, rear fog, export), is a relay which operates 3 turn signal lights and 6 hazard lights.
      • Part number 12450072 relay operates 2 turn signal lights and 4 hazard lights (domestic).

      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.

    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Owners may comment that the flasher on their 2000-02 full size pickup or utility model flashes faster than on other vehicles of the same model.
    • Cause：It is possible that an Export relay was installed into the vehicle.
    • Confirm：Inspect the part and part number.
    • Parts：Part number 11516051, for RPO option T79 (lamps, rear fog, export), is a relay which operates 3 turn signal lights and 6 hazard lights.
    • Parts：Part number 12450072 relay operates 2 turn signal lights and 4 hazard lights (domestic).
    • Repair：Use part number 12450072 to fix this concern.

    Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.

    Remedy
    Turn Signal Flashes Fast Owners may comment that the flasher on their 2000-02 full size pickup or utility model flashes faster than on other vehicles of the same model. It is possible that an Export relay was installed into this vehicle. Inspect the part and part number. Part number 11516051 for RPO option T79 (lamps, rear fog, export) is a relay which Turn Signal Flashes Fast operates 3 turn signal lights and 6 hazard lights. Part number 12450072 relay operates 2 turn signal lights and 4 hazard lights (domestic). Use part number 12450072 to fix this concern.

Known issuesVehicle body tilt or lean left / right (torsion bar front suspension)1

  1. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2019-04-08(2 earlier editions of this document folded here)

    Vehicle Lean Adjustment Preliminary Information

    1. 1Fault

      • The procedure is for diagnosing and correcting complaints of the vehicle leaning left or right.

    2. 2Finding the cause

      Steps to confirm (in the document’s order)

      1. Measure fender wheel-opening heights, front and rear, to quantify vehicle lean.
      2. The front wheel-opening height is known as P height, and the rear wheel-opening height is known as R height.
      3. P height and R height are the distance from the ground to the highest point on the wheel-opening, going through the center of the wheel.
      4. Before measuring, make sure the vehicle is on a level surface, such as an alignment rack.
      5. Before measuring, check the fuel level and add weight if necessary to simulate a full tank.
      1 more points

    3. 3Correction

      Repair

      1. If Z height is out of spec and the D height delta is greater than 1/2 inch (12 mm), adjust Z height until it is within spec and the P and R height deltas are less than 1/2 inch (12 mm).
      2. If adjustment is not possible, check the front eye of the rear leaf spring for matching color-coded tape or paint; both sides should be the same color. If not, switch springs side to side; if so, replace the leaf spring on the lower side only.
      3. If this is not possible, shim the body and/or pick-up box until the P and R height deltas are less than 1/2 inch (12 mm).
      4. After all adjustments are done, perform a front-end alignment and check headlight aim.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to GMC Yukon models, 1999 - 2006.
    • Applies to：Applies to vehicles with torsion bar front suspension.
    • Condition：The procedure is for diagnosing and correcting complaints of the vehicle leaning left or right.
    • Confirm：Measure fender wheel-opening heights, front and rear, to quantify vehicle lean.
    • Confirm：The front wheel-opening height is known as P height, and the rear wheel-opening height is known as R height.
    • Confirm：P height and R height are the distance from the ground to the highest point on the wheel-opening, going through the center of the wheel.
    • Confirm：Before measuring, make sure the vehicle is on a level surface, such as an alignment rack.
    • Confirm：Before measuring, check the fuel level and add weight if necessary to simulate a full tank.
    • Confirm：Check Z height and D height; see Trim Height Inspection Procedure.
    • Repair：If Z height is out of spec and the D height delta is greater than 1/2 inch (12 mm), adjust Z height until it is within spec and the P and R height deltas are less than 1/2 inch (12 mm).
    • Repair：If adjustment is not possible, check the front eye of the rear leaf spring for matching color-coded tape or paint; both sides should be the same color. If not, switch springs side to side; if so, replace the leaf spring on the lower side only.
    • Repair：If this is not possible, shim the body and/or pick-up box until the P and R height deltas are less than 1/2 inch (12 mm).
    • Repair：After all adjustments are done, perform a front-end alignment and check headlight aim.

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

    Remedy
    This Preliminary Information communication provides information to the technician about vehicles that have a lean to the left or right. Technician will need to measure fender wheel-opening heights, front and rear, to quantify vehicle lean. Fender wheel-opening heights are related to, but distinct from, trim height. The front wheel-opening height is known as P height, and the rear wheel-opening height is known as R height. Adjust and heights that are out of specification. After all adjustments are done, perform a front-end alignment and check headlight aim.

EXTERIOR LIGHTING3

  1. Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2023-02-28(5 earlier editions of this document folded here)

    Exterior Lamp Condensation and Water Leaks Service Bulletin

    1. 1Fault

      • Exterior lamps such as cornering, turn signal, backup, head or tail lamps may show very small water droplets, a fine mist or white fog (condensation) on the inside of the lens.

    2. 2Finding the cause

      Possible causes

      • Condensation occurs when the air inside the lamp assembly reaches the dew point through atmospheric changes.
      • Non-OE lamps are most often presented as holding moisture or with inoperative bulbs from corroded electrical connections; they appear to be installed as part of a collision repair.

      Steps to confirm (in the document’s order)

      1. Normal: the mist is located mainly in the lens corners near the vents and does not cover more than half the lens surface.
      2. Normal: the moisture clears when the vehicle is parked in a dry environment or driven with the lights on.
      3. Leak: water has accumulated in the bottom of the lamp assembly.
      4. Leak: the condition will not clear when the vehicle is parked in a dry environment or driven with the lights on.

    3. 3Correction

      Repair

      • A condition covering more than half the surface of the lamp lens indicates the need to service the lens or lamp assembly.

      Caution

      • Depending on the lamp and the atmospheric conditions, the time needed to clear the lamp may vary from 2 to 6 hours.
      • If the normal conditions are noted, advise the customer that replacing the lamp assembly may not correct the condition.
      • Moisture that "comes and goes" is considered a normal condition.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：Applies to 2023 and prior GM passenger cars and trucks, including medium duty trucks and excluding LCF medium duty trucks.
    • Condition：Exterior lamps such as cornering, turn signal, backup, head or tail lamps may show very small water droplets, a fine mist or white fog (condensation) on the inside of the lens.
    • Cause：Condensation occurs when the air inside the lamp assembly reaches the dew point through atmospheric changes.
    • Caution：Depending on the lamp and the atmospheric conditions, the time needed to clear the lamp may vary from 2 to 6 hours.
    • Confirm：Normal: the mist is located mainly in the lens corners near the vents and does not cover more than half the lens surface.
    • Confirm：Normal: the moisture clears when the vehicle is parked in a dry environment or driven with the lights on.
    • Caution：If the normal conditions are noted, advise the customer that replacing the lamp assembly may not correct the condition.
    • Repair：A condition covering more than half the surface of the lamp lens indicates the need to service the lens or lamp assembly.
    • Confirm：Leak: water has accumulated in the bottom of the lamp assembly.
    • Confirm：Leak: the condition will not clear when the vehicle is parked in a dry environment or driven with the lights on.
    • Caution：Moisture that "comes and goes" is considered a normal condition.
    • Cause：Non-OE lamps are most often presented as holding moisture or with inoperative bulbs from corroded electrical connections; they appear to be installed as part of a collision repair.

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

    Remedy
    This service bulletin provides information for dealers/technicians on Exterior Lamp Condensation and Water Leaks and Replacement Guidelines.

  2. Manufacturer communication2000–2003 GMC YUKON ・ 2003-09-26

    Daytime Running Lamp (DRL) Bulb Replacement

    1. 1Fault

    2. 2Finding the cause

      Not stated

    3. 3Correction

    Read the sentences of the record
    Remedy
    DAYTIME RUNNING LAMP (DRL) BULB REPLACEMENT. *TT

  3. Manufacturer communication2000–2003 GMC YUKON ・ 2003-02-14

    Trailer Brakes Applied When Headlights/Park Lamps Are On

    1. 1Fault

    2. 2Finding the cause

    3. 3Correction

      TRAILER BRAKES APPLIED WHEN HEADLIGHTS / PARK LAMPS ARE ON, BRAKE CONTROLLER ILLUMINATION. *TT

    Read the sentences of the record
    Remedy
    TRAILER BRAKES APPLIED WHEN HEADLIGHTS / PARK LAMPS ARE ON, BRAKE CONTROLLER ILLUMINATION. *TT

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