GMC Yukon 2000–2006

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2023-04-12(4 earlier editions of this document folded here)

ACDelco Spin-On Oil Filter Torque Specification Notification

1. 1Fault

   • Leak
   • An oil leak from underneath the front of the vehicle after an earlier oil service; the leak can take several thousand miles to appear.
   ↓→

2. 2Finding the cause

   Possible causes

   • The oil may be leaking from between the oil filter gasket and the mounting surface.

   Steps to confirm (in the document’s order)

   • The filter may be very easy to remove, sometimes by hand.
   ↓→

3. 3Correction

   Repair

   1. Lubricate the new oil filter gasket with clean engine oil.
   2. Install the oil filter 1 full turn after the gasket contacts the sealing surface on the filter mounting flange.

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2023-01-06(2 earlier editions of this document folded here)

EVAP Leak Diagnostic Service Bulletin (DTCs P0442/P0455)

1. 1Fault

   • Leak
   • Warning light
   • P0442
   • P0455 (general documents only)
   • The MIL is illuminated, and DTC P0442 (EVAP small leak detected) and/or P0455 (EVAP large leak detected) may be set in the ECM.
   ↓→

2. 2Finding the cause

   Possible causes

   • P0455 sets because of a large leak or a purge blockage: an unseated tube connection, a damaged tube, a canister vent valve stuck open, or a purge valve stuck closed.
   • P0442 sets because of a small leak, which can come from a purge valve stuck open or a canister vent valve stuck open.

   Steps to confirm (in the document’s order)

   1. Inspect every purge connection for proper installation, and look along the lines for damage or wear; if damage is seen, confirm it with the smoke test.
   2. Some leaks show only under pressure and some only under vacuum, so check both ways; cycling the purge and vent solenoids with GDS2 while inspecting may show a sticking valve.
   3. Critical connections to check include: purge tube to purge valve (at the intake manifold), purge tube to chassis EVAP line (rear of the engine, near the transmission), chassis EVAP line to canister, and fuel tank load line to canister.
   4. Also check the vent valve line at the vent valve, the fuel tank load line jumper connection near the fuel tank, and that the fuel tank cap is closed properly.
   5. If all connections are good, check the vent valve for a stuck-open position; if the vent valve works correctly, go on to the purge valve.

   1 more points
   ↓→

3. 3Correction

   Parts

   • No parts are required for this repair.

   Caution

   • For diagnostic instructions, DTC information and required tools, always follow the service information document for the vehicle and DTC being worked on.

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2022-09-07

MIL Illuminated with Fuel Trim and Oxygen Sensor Codes

1. 1Fault

   • Leak
   • Warning light
   • P0101
   • P0137 (general documents only)
   • P0138 (general documents only)
   • P0140 (general documents only)
   • P0141
   • P0157 (general documents only)
   • Customers may comment that the MIL is illuminated.
   • Initial diagnosis may show fuel trim and O2 sensor related codes including P0101, P0137, P0138, P0140, P0141, P0157, P0158, P0160 and P0161.
   • The listed codes also include P0171, P0174, P0420, P0430, P1174 and P1175.
   ↓→

2. 2Finding the cause

   Possible causes

   • These methods find small leaks around the O2 sensor embossments and slight cracks in an intake plenum or gasket.

   Steps to confirm (in the document’s order)

   1. If normal SI diagnostics do not lead to a resolution and an intake vacuum leak or exhaust leak is suspected, use the GE-52250 Variable Pressure Leak Detector (preferred), the J-41416 ultrasonic leak tester, or possibly soapy water with low pressure air into the tailpipe to find the leak.
   2. For an intake leak, introduce the smoke into the brake booster hose or the oil dipstick tube; soapy water can be sprayed near the gasket, seams and all vacuum nipples.
   3. For an exhaust leak, put the hose with smoke or air into the tailpipe sealed with shop towels, then spray soapy water around seals, seams and bosses.
   ↓→

3. 3Correction

   Parts

   • No parts are required for this repair.

   Caution

   • All of these tests are much more effective if the throttle body is covered or sealed.

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2019-03-18

Diagnostic Tip: Using Smoke Machine and Ultrasonic Detector for Air Leaks

1. 1Fault

   • Leak
   • Smoke or fire
   • P0101
   • P0137 (general documents only)
   • P0138 (general documents only)
   • P0140 (general documents only)
   • P0141
   • P0157 (general documents only)
   • The SES light is on, and initial diagnosis may show fuel trim and/or O2 sensor related codes such as P0171, P0174, P0420 and P0430.
   ↓→

2. 2Finding the cause

   Steps to confirm (in the document’s order)

   1. If normal SI diagnostics do not resolve it and an intake vacuum leak or exhaust leak is suspected, the J41413-200 Evaporative System Tester smoke machine, the J-41416 ultrasonic leak tester, or soapy water with low pressure air into the tailpipe may help find the leak.
   2. For an intake leak, the smoke can be introduced into the brake booster hose or the oil dipstick tube.
   3. Soapy water can be sprayed near the gasket and seams and on all vacuum nipples.
   4. For an exhaust leak, a hose into the tailpipe carrying smoke or air, sealed with shop towels, is effective.
   5. Then spray soapy water around the seals, seams and bosses.

   1 more points
   ↓→

3. 3Correction

   Caution

   • All of these tests are much more effective if the throttle body is covered/sealed.

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

Engine Check Lamp P0442 Evaporative Emissions System Notification

1. 1Fault

   • Gauge or instrument fault
   • Leak
   • Smoke or fire
   • Warning light
   • Check engine / Service Engine Soon
   • P0442
   • The service engine soon lamp (MIL) is on for DTC P0442, but a leak cannot be verified with the system test in the service information.
   ↓→

2. 2Finding the cause

   Steps to confirm (in the document’s order)

   1. With the scan tool, command the EVAP system CLOSED, start the engine and watch the tank pressure sensor value for about two minutes.
   2. If the tank pressure value changes (shows vacuum), remove the purge solenoid and pressurize its fuel tank side with the GE 41413-A / J 41413-A tester.
   3. If the tank pressure value does not change, install the CH-48096 adaptor between the purge line from the canister and the purge solenoid; use no other adaptor or pressurization method.
   4. With the EVAP system CLOSED, pressurize through the adaptor and let the system stabilize, watching the gauge for at least 5 minutes, then add smoke.
   5. Look for smoke or UV trace fluid at the purge solenoid, the engine side, the fuel cap or capless fill door, and the canister vent solenoid filter or fresh-air line.

   1 more points
   ↓→

3. 3Correction

   • Purge Solenoid: replaced

   Repair

   • If smoke passes through the purge solenoid, replace the purge solenoid.

   Caution

   • After verifying P0442, do not disturb any fuel system component before testing.
   • Test pressure must not exceed 13 in H2O (0.5 PSI (= 3.45 kPa)); more can make components perform inaccurately and lead to misdiagnosis.
   • A large temperature difference between vehicle, shop and tester seriously affects accuracy; let the vehicle adjust to shop temperature first.

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2018-06-11(4 earlier editions of this document folded here)

GM Products for Eliminating Vehicle Odors

1. 1Fault

   • Leak
   • Smoke or fire
   • GM Vehicle Care Odor Eliminator has been shown to greatly reduce or remove mold and mildew smells resulting from vehicle water leaks, as well as customer created odors such as smoke.
   ↓→

2. 2Finding the cause

   Steps to confirm (in the document’s order)

   • First confirm that all water leaks have been repaired and determine which areas were water soaked or wet; components with visible mold/mildew staining should be replaced.
   ↓→

3. 3Correction

   Repair

   1. If the interior is removed, treat the floor pan and primed/painted surfaces with a bleach/soap solution, rinse with clean water and dry.
   2. For hard surfaces, add 8 oz. of GM Vehicle Care Odor Eliminator (1 cup) to dish soap in a spray bottle and top off the bottle with tap water.
   3. Treat all carpeting and upholstered seats lightly to moderately with the formula at full strength, using a wide fan spray setting.
   4. For the ventilation system, start the vehicle, turn the fan on high cool (not the A/C setting), and spray the formula (10 trigger pulls) into the outside fresh air intake vent at the cowl.

   Parts

   • Part number 88861431 (in Canada, 88861436): GM Vehicle Care Odor Eliminator, 32 oz (946 mL) non-aerosol bottle.

   Part numbers printed in the document

   • 88861431Odor Eliminator, Spray Acdelco 32OzLook up at RockAuto (aftermarket candidates) ↗Search the web ↗

     Discontinued (no successor stated)as stated by GMPartsGiant (checked 2026-10-06) ↗

   • 88861436Look up at RockAuto (aftermarket candidates) ↗Search the web ↗

   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

   • Do not let the product come into contact with vinegar or any acidic substance.

Manufacturer communication2003–2006 GMC YUKON DENALI ・ 2018-04-23

Fix It Right for First Time Information

1. 1Fault

   • Leak
   • It is a table of field product reminders listing, per model year and vehicle line/condition, what to do, what not to do, and the reference bulletin.
   • The only row naming Yukon covers 2007-2013 Yukon XL Denali, Yukon Denali, Yukon XL and Yukon (with other listed trucks): a hydraulic power steering leak at the hose connection to the steering rack.
   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   Repair

   • For that leak the table says to verify the leak with dye and replace the Duckbill seal using J-42640 if necessary, and not to replace the steering gear or lines; the reference is 12-02-32-001A.

Manufacturer communication2006 GMC YUKON DENALI ・ 2020-08-10(1 earlier editions of this document folded here)

Power Steering Noise at Low Temperatures - Technical Bulletin

1. 1Fault

   • Leak
   • Noise
   • Noise or a fluid leak from the power steering pump, gear or high pressure side hose during extreme low outdoor temperature operation.
   ↓→

2. 2Finding the cause

   Possible causes

   • At -30°C (-22°F) or lower the power steering fluid may thicken and system pressures may rise, potentially causing noise or damage to components.
   ↓→

3. 3Correction

   Repair

   • Replace any damaged power steering components, flush the system and refill with Cold Climate power steering fluid.

   Parts

   • P/N 12345866 (in Canada 10953484): 16 oz. bottle Power Steering Fluid - Cold Climate.
   • P/N 12345867 (in Canada 10953471): 32 oz. bottle Power Steering Fluid - Cold Climate.

   Part numbers printed in the document

   • 12345866Fluid,P/S Cold Climate Acdelco 16OzLook up at RockAuto (aftermarket candidates) ↗Search the web ↗

     No successor statedas stated by GMPartsGiant (checked 2026-10-06) ↗

   • 10953484Look up at RockAuto (aftermarket candidates) ↗Search the web ↗

   • 12345867Fluid,P/S Cold Climate Acdelco 32OzLook up at RockAuto (aftermarket candidates) ↗Search the web ↗

     No successor statedas stated by GMPartsGiant (checked 2026-10-06) ↗

   • 10953471Look up at RockAuto (aftermarket candidates) ↗Search the web ↗

   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

   • In some extreme operating conditions this fluid may not correct the condition.

Manufacturer communication2006 GMC YUKON DENALI ・ 2018-05-21

Power Steering Fluid Leak at Fluid Reservoir Diagnosis

1. 1Fault

   • Leak
   • When diagnosing a power steering fluid leak, the technician may find a heat damaged fluid reservoir.
   ↓→

2. 2Finding the cause

   Possible causes

   • Super heated power steering fluid may affect the pump, reservoir and hoses, and these parts may show no apparent issue at the initial diagnosis.
   • Fluid temperatures high enough to distort or damage the reservoir may damage the power steering pump and affect its durability.
   ↓→

3. 3Correction

   Repair

   • When replacing a reservoir for a leak that appears to be caused by super heated fluid, also replace the power steering pump and hoses.

   Caution

   • Advise the customer not to hold the steering against the stop or end of travel for more than 5 seconds at an engine speed above 1,500 rpm.
   • Continuous spin-outs or "doughnuts" with the steering at or near the end of travel for more than 5 seconds at a time above 1,500 rpm also overheat the fluid.

Manufacturer communication2003–2006 GMC YUKON DENALI ・ 2021-04-16

Fluid Leakage vs. Seepage Identification Guide

1. 1Fault

   • Leak
   ↓→

2. 2Finding the cause

   Not stated

   ↓→

3. 3Correction

   Information Regarding the Differences Between Fluid Leakage and Seepage This bulletin is intended to help identify the differences between what is considered a fluid leak and what is considered seepage. Improper diagnosis may lead to unnecessary component replacement. Use the following information to determine if the condition is normal acceptable seepage or a defective component

Manufacturer communication2005–2006 GMC YUKON DENALI ・ 2017-12-22

Shock/Strut Fluid Residue Diagnosis

1. 1Fault

   • Leak
   ↓→

2. 2Finding the cause

   Steps to confirm (in the document’s order)

   1. The shock absorber or strut does not have to be removed from the vehicle for the inspection.
   2. Do not replace (level 1): oil or fluid residue only on the bottom or top of the shock absorber, not originating from the shaft seal at the upper part of the lower shock tube.
   3. Do not replace (level 2): a light film or residue from the shaft seal on approximately 1/3 or less of the lower shock tube.
   ↓→

3. 3Correction

   Repair

   1. Replace (level 3): an oil drip or trail down the lower shock tube originating from the shaft seal.
   2. Replace (level 4): an extreme wet film of oil from the shaft seal covering more than 1/3 of the lower shock tube.

   Caution

   • Shock absorbers and struts are fluid-filled and normally show some seepage, defined as an oil film or dust accumulation on the outside of the shock housing.
   • Shock absorbers and struts are not to be replaced under warranty for seepage.

Recall2000 GMC YUKON ・ 2000-11-17

Brake pipe wear contact recall

1. 1Fault

   • Leak
   ↓→

2. 2Finding the cause

   • Body Cross Sill: loose or misadjusted
   • Brake Line: worn
   ↓→

3. 3Correction

   Not stated

Manufacturer communication2000–2006 GMC YUKON DENALI ・ 2023-02-28(1 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 communication2000–2006 GMC YUKON DENALI ・ 2021-04-19(4 earlier editions of this document folded here)

Engine Block Cylinder Bore Damage Information

1. 1Fault

   • Leak
   • Misfire or rough idle
   • The block is suspected of cylinder bore damage, scoring or out of round as the cause of oil consumption, misfire, cylinder leakage or blow by.
   ↓→

2. 2Finding the cause

   • Cylinder: defective
   • Engine Block: defective

   Possible causes

   • If a catalytic converter fails and the brick breaks, its dust can be drawn back into the engine.

   Steps to confirm (in the document’s order)

   1. The peak to valley spec for crosshatch is .65-2.8 microns; any deviation and the crosshatch will be gone.
   2. Cylinder damage or scoring: the walls have grooves deep enough to catch with a finger nail.
   3. If there is crosshatch all the way around the bore from top to bottom, the bore is not out of round.
   4. Dirt intrusion: with a compromised filtering system the bores look lightly sand blasted, and the crosshatch is faint with no sharpness.
   5. A block with this converter-dust failure has bores that look sand blasted.
   ↓→

3. 3Correction

   Repair

   • If not caught early there will be no crosshatch and the engine will need to be replaced.

   Caution

   • GM has not had an issue with cylinders being machined out of round for any engine family in recent history.

Manufacturer communication2005–2006 GMC YUKON DENALI ・ 2018-05-29

Slow Tire Leak and Low Tire PSI Message Correction

1. 1Fault

   • Leak
   • A tire slowly loses air pressure over a period of days or weeks.
   ↓→

2. 2Finding the cause

   Possible causes

   • Abrasive elements from the environment get between the tire and the wheel at the bead seat, and the relative motion between tire and wheel lets them wear both materials.

   Steps to confirm (in the document’s order)

   1. The corrosion may be on the inboard or outboard bead seat and is not visible until the tire is dismounted from the wheel.
   2. After a water dunk tank leak test, if the leak is around the bead seat of the wheel, dismount the tire and examine the bead seat.
   3. Bead seat corrosion looks like blistering of the wheel finish, leaving a rough or uneven surface on which the tire cannot keep a proper seal.
   4. At 32,186 km (20,000 mi) or less, the total combined linear length of repairable corrosion is 100 mm (4 in) or less; beyond that, replace the wheel.
   5. Above 32,186 km (20,000 mi), the total combined linear length of repairable corrosion is 200 mm (8 in) or less; beyond that, replace the wheel.
   ↓→

3. 3Correction

   • Wheel: cleaned

   Repair

   1. Remove the corrosion and any flaking paint with a clean-up (fine cut) sanding disc or biscuit, back to material that is stable and firmly bonded to the wheel.
   2. Coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealant or equivalent.

   Caution

   • Remove only the material needed to eliminate the corrosion from the bead seat; keep the sealing surface as smooth and level as possible.
   • If loose coatings or corrosion extend to the visible surfaces on the face of the wheel, the wheel must be replaced.

Manufacturer communication2005–2006 GMC YUKON ・ 2022-07-25(4 earlier editions of this document folded here)

Sunroof Operation Concerns – Diagnostic Information

1. 1Fault

   • Leak
   • Noise
   • Customers may comment on intermittent sunroof operation, bind, noise, auto-reverse and/or water leaks.
   ↓→

2. 2Finding the cause

   Possible causes

   • Dirt and debris may collect on the sunroof seal or in the tracks and affect operation, cause noise or plug the water drainage system.
   ↓→

3. 3Correction

   Repair

   1. Open the sunroof, remove any obstacles or loose debris, and verify that the module drain holes are not plugged.
   2. Wipe the sunroof seal and roof sealing area with a clean cloth, mild soap and water; do not remove grease from the sunroof.

   Caution

   • Some replaced sunroof module assemblies were tested and found that simple cleaning of these areas would have repaired the condition without replacing the assembly.