GMC Yukon 2000–2006

From the manufacturer’s document

• Applies to：Applies to 1999-2013 GMC Savana, Sierra and Yukon (with a V8 engine per the model list) (note: the Yukon years run later than the years this service covers).
• Condition：With the SES light on, a P0300-P0308 DTC is found with misfires counting on a single cylinder, which may or may not be felt.
• Condition：The noise may be described as a chirp, squeak, squeal or tick and may increase off of idle.
• Cause：A worn cam lobe on this engine family generally makes a consistent chirp, squeak, squeal or tick at camshaft speed and/or a misfire with a P0300-P0308 DTC.
• Confirm：Press on the rocker arms with a wooden hammer handle while the noise is present; if pressing the valve side of a rocker changes the noise, a lifter and/or cam lobe concern on that cylinder is most likely.
• Confirm：Measure cam lobe lift at the push rod side of the rocker arm; it will differ from the SI specification but should be similar to the other rockers on the same bank.
• Confirm：A bore scope or pen light may help when inspecting the cam lobes through the lifter bores.
• Repair：If a worn cam lobe or lifter roller is found, replace the camshaft and all lifters per SI, plus the plastic lifter guide for the affected lifter (for the 2010 model year, all the plastic lifter guides).
• Confirm：A good sign of a sticking valve is that misfires keep counting during an aggressive deceleration with engine braking.
• Repair：If force is needed to tap the valve off its seat, there is excessive carbon build up, which may be repaired by decarboning the engine.
• Confirm：The Cylinder Leakage Test in SI should typically isolate valve leakage by showing excessive leakage past an intake or exhaust valve compared with the others.
• Confirm：The two pieces of a broken valve spring can stay stacked together and be hard to see, so lightly push on different places on the springs with a small hammer handle.

From the manufacturer’s document

• Applies to：The model table lists GMC Yukon models for model years 2000 - 2006, among other GM trucks, except export vehicles (RPO EXP).
• Condition：The SIR lamp stays on steady after an SDM or BCM has been replaced, with DTC B1001 current in the SDM.
• Cause：When the ignition is first turned to RUN, the SDM compares the restraints ID stored in the SDM to the restraints ID stored in the body control module (BCM).
• Cause：B1001 sets if the restraints ID in the SDM does not match the one in the BCM, or the VIN information in the SDM does not match the VIN information stored in the PCM/VCM.
• Repair：A replaced SDM or BCM must learn the restraints ID, which requires performing a 10 minute V.T.D. "Vehicle Theft Deterrent - Learn" with the Tech 2.
• Repair：On some vehicles a calibration may need to be selected after choosing "Vehicle Theft Deterrent - Learn"; select the one labeled "Vehicle Theft Deterrent for Passlock sensor".
• Caution：A 30 minute Theft relearn will not allow the SDM or BCM to learn the restraints ID.

From the manufacturer’s document

• Applies to：All brands and models, model years 1995 - 2025.
• Condition：The process for reaching the GM Tools site has changed.

From the manufacturer’s document

• Applies to：Various GM makes and models.
• Condition：Vehicle Wide Programming (VWP) is a new process to update software on GM vehicles.

From the manufacturer’s document

• Applies to：Applies to GM passenger cars and light duty trucks, model years 2000 to 2025.
• Condition：Some technicians may notice Service Programming System (SPS) errors; the document gives the troubleshooting for them.

From the manufacturer’s document

• Applies to：Applies to all passenger cars and trucks, 2000 to 2023 model years.
• Condition：To find the root cause of some component drains or logic lockups, the module is retrieved for analysis without being reset, by keeping it powered with a small battery.

From the manufacturer’s document

• Applies to：Applies to GM passenger cars and trucks, including medium duty, model years 2000 to 2021.
• Applies to：The bulletin applies only to vehicles with gasoline engines.
• Condition：The MIL is illuminated and DTC P0442 (EVAP small leak detected) and/or P0455 (EVAP large leak detected) is set in the Engine Control Module (ECM).
• Cause：DTC P0455 sets for a large leak or a purge blockage; a large leak can come from an unseated tube connection, a damaged tube, a stuck open canister vent valve or a stuck closed purge valve.
• Cause：DTC P0442 sets for a small leak, which can come from a stuck open purge valve or a stuck open canister vent valve.
• Confirm：Inspect all purge connections for proper installation and look for damage or wear along the lines; if damage is seen, confirm with the smoke test.
• Confirm：Some leaks show only under pressure and some only under vacuum, so check both ways.
• Confirm：Cycling the purge and vent solenoids with GDS2 while inspecting may indicate a sticking valve.
• Confirm：Critical connections on the engine side: purge tube to purge valve at the intake manifold, purge tube to chassis EVAP line at the rear of the engine near the transmission, and chassis EVAP line to canister.
• Confirm：Critical connections on the tank side: fuel tank load line to canister, vent valve line to vent valve, fuel tank load line jumper connection near the fuel tank, and the fuel tank cap being closed properly.
• Confirm：If all connections are good, check the vent valve for a stuck open position.
• Confirm：If the vent valve is verified to be functioning correctly, go on to investigate the purge valve.

From the manufacturer’s document

• Applies to：All models, model years 2000 - 2020.
• Condition：Customers complain of vehicle vibration under any of various driving conditions.
• Caution：Attempting a vibration repair without knowing the frequency is compared to repairing a check engine light without knowing the stored DTC.
• Confirm：Drive the vehicle to verify the condition and record a Pico data file of the concern.
• Confirm：Review the Pico file and use it to help determine the root cause or component.
• Repair：Repair the vehicle using the Pico information together with any published information relevant to the vibration frequency observed.
• Caution：12-03-10-001B is a generic document on the possibility of tire to rim orientation and of the tire slipping on the rim.
• Caution：Component level vibrations such as blower motor, brake pulsation or shudder on turns do not require a Pico file.

From the manufacturer’s document

• Applies to：Covers 2000-2014 GM passenger cars and light duty trucks.
• Applies to：Vehicles equipped with OnStar (RPO UE1) are covered.
• Cause：Canadian wireless service providers plan to decommission their 2G CDMA network through 2015, and OnStar currently depends on working 2G CDMA networks.
• Repair：Canadian vehicles without OnStar 3G/4G LTE need a hardware upgrade to keep OnStar services without interruption.
• Caution：Hardware upgrade sets are VIN specific and must be installed on the vehicle they were ordered for.
• Confirm：Before starting, inspect the radio to verify that the GM original equipment radio is present and functioning.
• Caution：The Tech 2 cannot communicate with the upgraded OnStar module; GDS 2 must be used for diagnostics specific to the upgraded OnStar system.
• Caution：Before reprogramming, verify that battery voltage is more than 12 volts but less than 16 volts; the battery must be fully charged first.
• Caution：Do not press the red OnStar Emergency Button at any time during the installation; it causes module configuration issues.
• Caution：Canadian OnStar equipped vehicles travelling into the United States are to be serviced as any U.S. vehicle would be.
• Repair：The labor time table lists 1.0 hr for 2003-2006 GMC Yukon models.

From the manufacturer’s document

• Applies to：Applies to all models 2000 - 2019 equipped with a USB port.
• Repair：Use only Apple cables/cords for diagnostic testing on any concern involving an Apple device.

From the manufacturer’s document

• Applies to：Applies to 2013 and earlier GM passenger cars and trucks.
• Condition：The document is a field product reminder list of issues by vehicle line under the heading Fix it Right the First Time; it is an index to other documents.

From the manufacturer’s document

• Applies to：The model list addresses 2000-2009 GM passenger cars and light duty trucks.
• Applies to：The bulletin only applies to vehicles that have been involved in the Canadian OnStar cellular communication upgrade.
• Confirm：Verify in the Investigate Vehicle History (IVH) whether the upgrade has been completed before proceeding.
• Caution：On GSM-upgraded vehicles, the GDS 2 must be used for scan tool communication with the Telematics Communication Interface Control Module (TCICM), or OnStar module.
• Caution：All scan tool communications with other modules on these vehicles continue to be performed using the Tech 2.
• Repair：Because GDS 2 will not decode the VIN of a vehicle originally supported by the Tech 2, a manual selection must be performed.
• Repair：Select Additional Options, then select the OnStar Canada GSM option.

From the manufacturer’s document

• Applies to：Applies to all 2000-2015 GM passenger cars and light duty trucks with a Gen6, Gen7, Gen8, Gen9 or Gen10 OnStar system.
• Cause：The condition exists because the existing cell phone provider has no roaming agreements in areas outside of Canada.

From the manufacturer’s document

• Applies to：Applies to 2000-2015 GM passenger cars and light duty trucks with the OnStar Canada upgrade.
• Condition：Incoming caller ID may no longer be available or displayed after the Canada OnStar upgrade is performed.

From the manufacturer’s document

• Applies to：Applies to all 2000 - 2018 models with RPO UE1.
• Condition：For OnStar to operate properly, the module must be programmed (set up) specifically for the vehicle application in which it is installed.

From the manufacturer’s document

• Applies to：Applies to 2016-2017 GM passenger cars and trucks, and 2000-2015 GM passenger cars and trucks with the Canada OnStar Upgrade.
• Repair：Only modules and components in a part restriction program require a call to the GM Technical Assistance Center (TAC) to obtain the part.

From the manufacturer’s document

• Applies to：2000-2016 GM passenger cars and light duty trucks with OnStar (UE1).
• Repair：To receive any over-the-air programming or update, the customer must accept the OnStar terms and conditions and have an active OnStar account.

From the manufacturer’s document

• Applies to：Applies to 2015 GM passenger cars and light duty trucks with OnStar 4GLTE Gen10 WIFI (RPO VV4).
• Condition：A customer may comment that the OnStar WIFI is inoperative or stuck in 2G.

From the manufacturer’s document

• Applies to：Applies to 2016 and prior GM passenger cars and trucks.
• Condition：Emoji icons in the customer's iPhone Contacts list may keep Bluetooth voice recognition from working properly.

From the manufacturer’s document

• Applies to：Applies to 2000 - 2015 GM passenger cars and light duty trucks with the OnStar Canada Upgrade (OnStar 9.4 or Gen 10); 2015 - 2017 vehicles with OnStar Gen10 are listed separately.
• Repair：Cycle power to the VCIM and place a test call to OnStar; if the concern is still present, install the test antenna and retest.

From the manufacturer’s document

• Applies to：Applies to 2000-2015 GM passenger cars and light duty trucks with OnStar Gen6, Gen7, Gen8 or Gen9.
• Condition：Pressing the OnStar blue button, the red emergency button or the hands-free call button results in cellular messages, progression tones, dropped calls or no data on the call with OnStar.

From the manufacturer’s document

• Applies to：All models, model years 2000 - 2017, with OnStar Gen6, Gen7, Gen8, Gen9 and Gen10.
• Condition：During a battery parasitic drain test it can be unclear what the normal power consumption of the OnStar system should be.
• Caution：The OnStar system stays powered for an extended time after ignition off so that remote services such as door unlock, horn honk and light flash can be carried out.
• Confirm：The system generation can be read with a Tech 2 under Body > VCIM > Module ID Information > Module Information 2.
• Confirm：All Gen 6, 7, 8 and 9 systems are powered continuously for 48 hours from ignition off.
• Confirm：After the 48 hours, Gen 6 and some Gen 7 power off; Gen 7.XXL and all Gen 8 systems cycle 9 minutes OFF and 1 minute ON for an additional 72 hours.
• Confirm：Expected current draw of the OnStar module with ignition ON is 240 to 400 mA.
• Confirm：With ignition OFF and in DRx (stand-by mode) the draw is 3 to 20 mA, for 48 hours on Gen 6, 7, 8.
• Confirm：With ignition OFF and after DRx has been canceled the draw is 1 to 3 mA, reached after 48 hours on Gen 6, 7, 8.
• Caution：A short spike of current may be seen at the beginning and end of the 1 minute ON stage.

From the manufacturer’s document

• Applies to：All models, model years 2000 - 2017.
• Condition：The customer may report that the OnStar center is unable to provide Turn by Turn (TBT) service.

From the manufacturer’s document

• Applies to：Applies to all brands and models, model years 2000 - 2017.
• Condition：A customer may report that the OnStar system attempts or completes phone calls that the operator of the vehicle did not initiate.

From the manufacturer’s document

• Applies to：2014 and prior GM cars and light duty trucks.
• Confirm：When a test step for open, continuity or resistance requires disconnecting a connector or component, check the pin fit and tension of all related terminals before replacing any component.
• Confirm：Always use the recommended terminal test tool for these tests.