GMC Yukon 2000–2006

Manufacturer communication2002–2006 GMC YUKON DENALI ・ 2018-02-21

Engine Misfire and Related Issues Notice

1. 1Fault

   • Leak
   • Misfire or rough idle
   • Noise
   • Warning light
   • Check engine / Service Engine Soon
   • P0300
   • P0308
   • With the SES light on, a P0300-P0308 DTC is found with misfires counting on a single cylinder that may or may not be felt.
   • A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed); it may be a chirp, squeak, squeal or tick and may increase off idle.
   ↓→

2. 2Finding the cause

   • Valve Spring: broken
   • Active Fuel Management Lifter: failed
   • Valve: defective
   • Camshaft Lobe: worn
   • Lifter Roller: worn

   Possible causes

   • When SI diagnosis does not isolate the cause, it may be a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, or a collapsed AFM (Active Fuel Management) lifter.

   Steps to confirm (in the document’s order)

   1. During the noise, press with a wooden hammer handle on the valve side, push rod side and side of each rocker arm; if pressure on the valve side changes the noise, it is most likely a lifter and/or cam lobe concern on that cylinder.
   2. Measure cam lobe lift at the push rod side of the rocker arm and compare with other rockers on the same bank; the misfiring or ticking cylinder should have clearly less lift if a lifter roller and/or cam lobe is worn.
   3. A good indicator of a sticking valve is misfires that continue to count on an aggressive deceleration with engine braking.
   4. For a suspected sticking valve, snap the valve onto its seat and confirm it comes off easily; if force is needed to tap it off the seat, excessive carbon build up exists, which may be repaired by decarboning the engine.
   5. The Cylinder Leakage Test outlined in SI should isolate valve leakage by finding excessive leakage past an intake or exhaust valve compared with the others.

   1 more points
   ↓→

3. 3Correction

   Repair

   • If a worn camshaft lobe or lifter roller is found, replace the camshaft and all lifters per SI, and also replace the plastic lifter guide for the lifter that had the damage.

   Caution

   • A worn cam lobe is easy to overlook through the lifter bores, and unworn lifter rollers do not mean the related cam lobes are okay; both must be carefully inspected.
   • If an AFM lifter concern is suspected, refer to the latest version of PIP4568 for additional information.

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2017-08-15

Vehicle Lean Preliminary Information

1. 1Fault

   • Lights (headlights, turn signals)
   • The procedure is for customer complaints of the vehicle leaning left or right, whether the lean appears in the front, the rear, or both ends.
   ↓→

2. 2Finding the cause

   Steps to confirm (in the document’s order)

   1. Measure the fender wheel-opening heights, front and rear, to quantify the lean.
   2. P height and R height are each the distance from the ground to the highest point of the wheel opening, measured through the center of the wheel.
   3. If the left-to-right difference in P and/or R height is 1/2 inch (12 mm) or less, no repairs are suggested because the vehicle is within specification; if it exceeds 1/2 inch (12 mm), follow one of the three diagnostics.
   ↓→

3. 3Correction

   Repair

   1. Generally the stance can be adjusted with the torsion bar adjuster bolts.
   2. If Z height is out of spec and the D height difference is greater than 1/2 (12 mm), adjust Z height until it is within spec and the P and R height differences are less than 1/2 inch (12 mm).
   3. If adjustment is not possible, check the front eye of the rear leaf springs for matching color-coded tape or paint; if the two sides differ, switch the springs side to side, and if they match, replace the leaf spring on the lower side only.
   4. After all adjustments are done, perform a front-end alignment and check headlight aim.

   Caution

   • Before measuring, set the tire pressures to the pressure shown on the certification label.
   • Before measuring, check the fuel level and add weight if necessary to simulate a full tank.
   • The P and R heights are not set at the factory, and no specification is given for them.

Manufacturer communication2001–2006 GMC YUKON DENALI ・ 2024-01-19(1 earlier editions of this document folded here)

Headlamp, Tail Lamp, License Lamp or Fog/Driving Lamp Damage

1. 1Fault

   • Lights (headlights, turn signals)
   ↓→

2. 2Finding the cause

   Possible causes

   • A variety of chemicals can cause crazing or cracking of the polycarbonate lens.
   • Bulbs with a higher output than original equipment run hotter, and the excess heat can melt the socket, housing or lens.

   Steps to confirm (in the document’s order)

   • Broken mounting tabs, rear housing fractures and loose components inside the lamp assembly are evidence of impact damage.
   ↓→

3. 3Correction

   Repair

   • When servicing any exterior lighting assembly, transfer any electrical connection seals to the new part.

   Caution

   • Clean exterior lamps and lenses only with lukewarm or cold water, a soft cloth and a car washing soap.
   • Do not let a shop mat or fender cover drape over a headlamp while the DRL or headlamps are on; the lens may craze or deform.

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

   • Leak
   • Lights (headlights, turn signals)
   • 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.

Manufacturer communication2000–2002 GMC YUKON ・ 2006-01-09

Fog Lamps Inoperative

1. 1Fault

   Not stated

   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   FOG LAMPS INOPERATIVE. *TT

Manufacturer communication2001–2003 GMC YUKON ・ 2003-09-29

Outside Rearview Mirror Courtesy Lamp Falls Out, Bulb Burns Out

1. 1Fault

   Not stated

   ↓→

2. 2Finding the cause

   • Rearview Mirror Courtesy Lamp: broken
   ↓→

3. 3Correction

   OUTSIDE REARVIEW MIRROR COURTESY LAMP FALLS OUT, BULB BURNS OUT. *TT

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

Daytime Running Lamp (DRL) Bulb Replacement

1. 1Fault

   • Lights (headlights, turn signals)
   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   • Daytime Running Light Bulb: replaced

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

Trailer Brakes Applied When Headlights/Park Lamps Are On

1. 1Fault

   • Lights (headlights, turn signals)
   ↓→

2. 2Finding the cause

   • Brake Controller: electrical fault
   ↓→

3. 3Correction

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

Owner complaint2002 GMC YUKON ・ 2005-10-04

Front left fog running light out since 6 months after purchase

1. 1Fault

   THE FOG RUNNING LIGHT ON THE FRONT LEFT SIDE HAS BEEN OUT SINCE 6 MONTHS AFTER THE PURCHASE OF OUR VEHICLE.

   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   • Bulb: replaced (says it came back)

Manufacturer communication2001–2006 GMC YUKON DENALI ・ 2018-05-21(1 earlier editions of this document folded here)

Radio and Instrument Cluster Warranty Claims

1. 1Fault

   • Radios and instrument panel clusters have been returned with physical damage that makes problem analysis difficult and the root cause impossible to determine.
   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   This informational bulletin provides information regarding the inappropriate warranty claims submitted for damaged radios and instrument panel clusters, provides exampls on whats an acceptable for warranty and whats not

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2017-12-14

Inaccurate Odometer Reading – Preliminary Information

1. 1Fault

   • Gauge or instrument fault
   • A customer may say the odometer appears inaccurate compared with a known distance traveled.
   ↓→

2. 2Finding the cause

   Steps to confirm (in the document’s order)

   1. Use a hand-held GPS unit to test the odometer.
   2. On a straight road over a mile long, mark the GPS waypoint when the odometer (not the trip odometer) rolls over a digit.
   3. Confirm that the original size tires and wheels are mounted and that the axle ratio is as specified on the SPID label and unmodified.
   4. If those are correct and the odometer is beyond the limit, consider the relationship between the VSS and the reluctor on the transmission output shaft.
   5. Closely inspect the associated wiring and any connectors in the circuits.
   ↓→

3. 3Correction

   Repair

   • Finally, it may be necessary to exchange the IPC with a replacement unit.

   Caution

   • Generally a tolerance of plus or minus 4% is allowed.
   • Do not compare with another vehicle or with the trip odometer.

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2017-08-15

Instrument Panel Cluster Mileage Programming Information

1. 1Fault

   • Gauge or instrument fault
   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   • Instrument Panel Cluster: replaced

   Repair

   • When the odometer cannot be set to the actual vehicle mileage, it must be set at zero and a label affixed to the driver's door frame by the service agent.

Manufacturer communication2001–2002 GMC YUKON DENALI ・ 2004-08-25

Interior Lamps Inoperative - Courtesy Lamp Module Location

1. 1Fault

   Not stated

   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   INTERIOR LAMPS INOPERATIVE LOCATION OF COURTESY LAMP MODULE. *MJ