GMC Yukon 2000–2006

From the manufacturer’s document

• Applies to：Applies to GM passenger cars and trucks, 2002 through 2023, with V6/V8 pushrod engines.
• Condition：Misfire, chirp, squeak, squeal or tick noise, or MIL illuminated.
• Condition：DTCs P0300 (engine misfire detected) and P0301 through P0308 (misfire detected on cylinders 1 through 8) are listed.
• Confirm：A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).
• Cause：Possible causes: worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, or a collapsed AFM lifter.
• Confirm：If applying pressure to the valve side of the rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.
• Confirm：Disconnect the coils and injectors on one bank, run the engine with that valve cover removed, back off the rocker arm a couple of turns and listen for a change in the noise.
• Confirm：Measure cam lobe lift at the pushrod side of the rocker arm and compare with other rockers on the same bank; the misfiring or ticking cylinder should have clearly less lift.
• Caution：A damaged cam lobe is easy to overlook through the lifter bores, and unworn lifter rollers do not mean the cam lobes are okay; inspect both carefully.
• Repair：If a worn camshaft lobe or lifter roller is found, replace the camshaft and all lifters, and the plastic lifter guide for the affected lifter.
• Confirm：A good indicator of a sticking valve is misfires that keep counting on an aggressive deceleration with engine braking.
• Confirm：A broken valve spring may stay stacked together and be hard to see; lightly push on different places on the springs with a small hammer handle.

From the manufacturer’s document

• Applies to：Applies to GMC Yukon models, 2002 - 2018, with a V8 engine.
• Condition：Customers may complain of an SES light, engine misfire, and/or engine noise.
• Condition：If the SES light is on, there will be a P0300-P0308 DTC with misfires counting on a single cylinder, which may or may not be felt.
• Condition：A verified noise is not eliminated by canceling fuel injectors and occurs at camshaft speed (half of crankshaft speed).
• Cause：If 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.
• Confirm：During the noise, press with a wooden hammer handle on the rocker arms at the valve side, push rod side, and side of the rocker to find which one is making noise.
• Confirm：If pressure on the valve side of the rocker changes the noise, it is most likely a lifter and/or cam lobe concern on that cylinder.
• Confirm：Measure the cam lobe lift at the push rod side of the rocker arm.
• Repair：If a worn camshaft lobe or lifter roller is found, follow SI procedures to replace the camshaft and all lifters.
• Repair：Also replace the plastic lifter guide for the lifter that had the damaged cam lobe and/or lifter roller.
• Confirm：A good indicator of a sticking valve is engine misfires that continue to count on an aggressive deceleration with engine braking.
• Confirm：Release the air pressure from the cylinder and work the valve up and down in the guide while turning it 360 degrees; if any binding is felt, a stem to guide clearance concern exists.
• Repair：Refer to the latest version of PIP4753 for decarboning instructions.
• Confirm：Typically, the Cylinder Leakage Test outlined in SI should isolate valve leakage.
• Repair：If a broken valve spring is found, replace the broken valve spring as necessary.
• Caution：If an AFM lifter concern is suspected, refer to the latest version of PIP4568 for additional information.

From the manufacturer’s document

• Applies to：Applies to 1999-2007 GMC Sierra and Yukon XL (among other listed GM trucks and vans) with the 4L80E (RPO MT1) or 4L85E (RPO MN8) transmission (note: the Yukon XL range runs to 2007).
• Condition：The 4L80E/4L85E automatic transmission may have a planetary gear whine noise in first and second gear, typically louder in first gear than in second.
• Caution：This planetary gear whine can be characteristic of the 4L80E/4L85E; compare the vehicle with an identically built vehicle (same GVWR) before attempting any repairs.
• Confirm：If the noise is judged abnormal and the transmission was built after 9-01-03, perform the Rear Unit End Play Check (SI Document ID # 52027).
• Confirm：The correct end play is between 0.127-0.508 mm (0.005-0.020 in).
• Repair：If end play is out of specification, inspect and replace the output planetary gear set (661 - Output Carrier Assembly and 650 - Sun Gear) as necessary.
• Repair：Set the rear end play with the correct selective thrust washer (674), targeting between .010 and .015 in.
• Repair：If end play is within specification, replace the transmission assembly, referring to bulletin 02-07-30-029A before ordering it.

From the manufacturer’s document

• Applies to：This is an equipment recall by Federal-Mogul of certain wheel hub assemblies sold as replacement parts only.
• Applies to：The recalled hub assemblies were packaged and sold between January 23, 2006 and December 20, 2007 under the National and CARQUEST Premium (BGS/Blue) brands, in 7 base part numbers.
• Parts：The recalled part numbers are 515020, 515021, 515025, 515053, 515054, 515059 and 515060.
• Applies to：The application lists include GMC 1500 Yukon (2WD) and GMC 1500 Yukon XL (2WD), 2001-2006.
• Applies to：ILJIN manufactured the recalled hub assemblies from December 27, 2005 to November 29, 2007.
• Condition：The inboard retention nut that maintains the hub bearing assembly can loosen, resulting in an ABS light indication, noise, and/or wheel separation from the vehicle; wheel separation can result in a vehicle crash.
• Confirm：On 2x4 vehicles, raise the vehicle on an approved hoist first; the hub assembly is good if a yellow, green or blue paint mark is seen on the grease cap on the inboard side of the steering knuckle.
• Confirm：If the paint mark is not present, remove the wheel and the brake rotor and clean rust from the hub assembly face to check for the date code stamping.
• Confirm：Defective hub assemblies can be identified by the country of origin on the package together with a recalled date code, by the date code on the package, or by the date code on the hub assembly.
• Confirm：If a round yellow sticker is present on the box label, the part is good.
• Repair：The hub assemblies were manufactured for aftermarket use; owners of these parts should have them removed and replaced as soon as possible.
• Repair：Federal-Mogul will replace the recalled hub assemblies free of charge.

From the manufacturer’s document

• Applies to：This is an equipment recall of fuel filters manufactured by Interfil in Mexico and sold by Honeywell under the FRAM brand name, part number G3727, intended for aftermarket installation on the vehicle applications in the attached table.
• Applies to：Only filters with date codes X52911 through X60801 sequentially or X600141, and with a Mexico country of origin marking on the filter housing, are subject to the recall.
• Applies to：The application table lists YUKON 1992 - 2005, YUKON DENALI 2005, YUKON DENALI XL 2005, YUKON XL 1500 2000 - 2005 and YUKON XL 2500 2000 - 2005.
• Condition：The connector on the fuel filter was not manufactured to specification, so the O-ring may not seat correctly on the fuel line; this may cause an inadequate seal, potentially leading to a fuel leak (wetting or dripping) and possible vehicle fire.
• Confirm：The part number (G3727), country of origin (Mexico) and the date code (e.g., X60031) are located on the side of the fuel filter.
• Repair：Honeywell will replace the subject fuel filters at no charge to the customer.

From the manufacturer’s document

• Applies to：The model list names GMC Yukon models, 1999 - 2019.
• Condition：Light duty trucks with automatic transmission and 4 wheel drive may make a grinding/ratcheting noise when the transmission is shifted into park while the transfer case is in 4 wheel drive low (4LO) range.
• Cause：When the transmission is shifted from drive or reverse into park with the transfer case in 4LO, the driveline unloads and turns the propeller shaft approximately 1/8 of a turn.
• Cause：The gear reduction in the transfer case makes the transmission output shaft turn faster than the parking pawl will hold, so the parking pawl grinds/ratchets until the output shaft stops.
• Condition：The grind/ratchet noise lasts approximately one second.
• Caution：This should be considered characteristic of 4 wheel drive vehicles operated in 4LO.
• Caution：Replacing transmission, transfer case and/or driveline components will not resolve the concern; shifting into park with the transfer case in the 4HI or 2HI range is recommended.

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.

From the manufacturer’s document

• Applies to：The model list covers 2003-2013 Cadillac Escalade, Chevrolet Avalanche, Silverado, Suburban, Tahoe and GMC Sierra and Yukon models, plus the 2003-2009 Hummer H2 (note: the Yukon range runs to 2013).
• Condition：Owners may report a whine noise that normal diagnostics trace to the power steering pump, most commonly heard between idle and 2000 rpm.
• Repair：GM dealers report that flushing and refilling the power steering system with Lucas Power Steering Fluid with Conditioners has reduced or eliminated the noise; GM Engineering has not evaluated this product.
• Parts：The fluid is Lucas PN 10442, a synthetic base fluid sold in pint containers at most auto parts stores; most applications need 6 to 8 pints to flush and fill the system.
• Cause：A new design power steering pump that helps improve or eliminate this noise was introduced with the new body style pickups and utilities from model year 2007 and the 2008 H2.
• Repair：For vehicles built before that change, or if the Lucas fluid is not readily available, install the latest design GM power steering pump, looking up the part number in the GM Electronic Parts Catalog (EPC).
• Repair：The warranty labor operation is E9523, Flush and Bleed Power Steering System, 0.9 hour.

From the manufacturer’s document

• Applies to：Applies to 2000-2024 vehicles of all brands and models.
• Confirm：For an unusual noise that is hard to identify or pinpoint, record a sound or video file of the noise before disassembly and before calling Technical Assistance.

From the manufacturer’s document

• Applies to：2014 and prior GM passenger cars and light duty trucks.
• Condition：On automatic transmission vehicles, a clunk noise when shifting between Park and Drive, Park and Reverse, or Drive and Reverse.
• Condition：A clunk noise while driving when the accelerator is quickly depressed and then released.
• Confirm：Compare the complaint vehicle with a like vehicle; if the results are the same, it is a normal condition.
• Cause：Gear clearance or freeplay (lash) can produce a clunk whenever a gear is loaded and unloaded quickly or the direction of rotation is reversed.
• Cause：In a 4-wheel drive vehicle the transfer case gears and their clearances add freeplay on top of that from the rear axle gears, universal joints and transmission.
• Caution：Because every driveline component has some lash by design, changing driveline components may not reduce the lash satisfactorily.
• Caution：The clunk noise does not adversely affect durability or performance.
• Caution：Do not confuse this with the clunk at stop or from launch that is handled by cleaning/lubricating the rear propshaft slip yoke splines (Corporate Bulletin Number 09-04-21-003D or later).

From the manufacturer’s document

• Applies to：Applies to 2013 and prior passenger cars and light duty trucks, including Saab and Saturn.
• Condition：The customer notices a noise or vibration that seems abnormal and may not have been there when the vehicle was new.
• Confirm：The first diagnostic step is to evaluate the vehicle for any after-market accessories.
• Cause：Step bars/nerf bars that touch both the truck frame and the cab without insulation carry the noise of a normally operating drive train into the passenger area.
• Cause：Other known contributors are running boards, bug shields, sun visors, vent shades, emergency lights, custom grilles, ski racks and bicycle racks.
• Confirm：These items must be removed to evaluate whether they contribute to the concern.
• Caution：If the root cause is a non-GM aftermarket accessory, no warranty claim should be filed; it is a customer pay item.

From the manufacturer’s document

• Applies to：All brands and models, model years 2000 - 2021.
• Condition：Noise from underneath a vehicle equipped with an automatic transmission.
• Caution：Do not remove the flex plate to torque converter bolts, push the converter back toward the transmission and start the engine to tell whether the noise is from the engine or the transmission.
• Cause：Running the engine with those bolts removed may damage the pilot on the front of the torque converter, the pilot hole in the end of the crankshaft, or both.
• Confirm：Use chassis ears to isolate the component or assembly that is the loudest source of the noise.

From the manufacturer’s document

• Applies to：Applies to GM passenger cars and trucks, model years 2000 to 2023.
• Condition：A noise comes from underneath a vehicle equipped with an automatic transmission.
• Condition：The technician may find that the noise comes from the bell housing area.
• Caution：Do not separate the torque converter from the flex plate.
• Caution：Do not remove the flex plate to torque converter bolts, push the converter back and start the engine to tell whether the noise is from the engine or the transmission.
• Cause：Running the engine with those bolts removed may damage the pilot on the front of the torque converter, the pilot hole in the end of the crankshaft, or both.
• Confirm：Use chassis ears to isolate the component or assembly that is the loudest source of the noise.

From the manufacturer’s document

• Applies to：Applies to 2016 and earlier GM passenger cars and light duty trucks equipped with an automatic transmission.
• Condition：At start up after a cold soak, the vehicle may rock or move slightly forward or rearward while in Park, sometimes with a clunk noise.
• Cause：Residual transmission fluid in the clutch packs creates a partial apply on start up.
• Cause：The movement stops when the parking pawl holds and/or the fluid exhausts completely from the clutch packs.
• Caution：The condition is normal and no repairs should be attempted.
• Confirm：Verify by comparing with another identically built vehicle under the same cold conditions.
• Caution：The slight movement has no adverse effect on the transmission.
• Repair：To prevent the movement, apply the parking brake whenever the vehicle is parked, as the Owner's Manual recommends.

From the manufacturer’s document

• Applies to：Applies to the listed models equipped with the 3.5L or 3.9L engine (RPOs LZ4, LZE, LZ8, LGD, LZ9, LZG, LX9).
• Repair：Inspect the crankshaft balancer for an outer ring slipping on the center hub; if found, replace the crankshaft balancer.

From the manufacturer’s document

• Applies to：Applies to 2022 and prior GM passenger cars and light duty trucks.
• Condition：Ride, handling and road noise concerns may be caused by improperly adjusted tire pressure.
• Confirm：The first step in diagnosing these concerns is to verify that the tires are inflated to the correct pressures.
• Confirm：The tire placard is on the driver's side front or rear door edge, the center pillar, or the rear compartment lid.
• Caution：The recommended inflation pressure is not the pressure printed on the tire sidewall.
• Confirm：Generally a 5.6°C (10°F) temperature change equals a 6.9 kPa (1 psi) tire pressure change.
• Confirm：A "cold" tire is one that has sat for at least 3 hours or been driven no more than 1.6 km (1 mi).
• Caution：Always inspect and adjust the pressure when the tires are cold.
• Condition：During cold weather the Tire Pressure Monitor (TPM) indicator (a yellow horseshoe with an exclamation point) may illuminate.
• Repair：If the indicator goes off after the tires warm up, reset the pressure to placard pressure at the cold temperature.
• Caution：Vehicles with different front and rear pressures need to be adjusted after tire rotation.
• Caution：To prevent electrostatic discharge damage to the Tire Pressure Monitoring Sensor (TPMS), the technician should be statically discharged before checking or filling tires.