2008 GMC Sierra Denali Technical Service Bulletins

1,154 technical service bulletins (TSBs) are on record for the 2008 GMC Sierra Denali. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10113921Mar 8, 2016Equipment. This Preliminary Information communication advises the technician after the OnStar Canada upgrade the OnStar Vehicle Diagnostic Email report is inoperative. Please communicate to the customer that we apologize for this inconvenience and that General Motors is working on a solution for this concern.
• 10113915Mar 7, 2016Engine cooling. This Preliminary Information communication advises the technician of two types of DEX-COOL 50/50 Premix are available through General Motors Service Parts Operations, one with bitterant and one without. Bitterant is a chemical that is added to products to make them smell or taste extremely bitter and is required in some states, such as California, Oregon, New Mexico, Colorado, and Vermont.
• 10112779Mar 7, 2016Electrical system. This informational bulletin provides information on vehicles may rock or move slightly forward or rearward while in Park at start up after cold soak and that this is considered a normal conditon and no repairs are necessary
• 10113914Mar 4, 2016Engine cooling. This Preliminary Information communication provides information to the technician about gasoline powered cars, mid-size trucks, light duty trucks, and heavy duty trucks with premature catalytic converter failures. It is recommended to inspect for a poor crimp on the coil grounds ring terminal at the engine block for the bank with the concern and repair the wire.
• 10112771Mar 2, 2016Equipment. This informational bulletin provides information on New Vehicle Pre-Delivery Inspection (PDI) - Delivering Quality Vehicles and Generating Higher CSi Scores
• 10112770Mar 2, 2016Electrical system. This informational bulletin provides information on Interior Cleaning - Instrument Panel (IP), Hard or Plastic Surfaces, Seats, Carpet, Leather, Vinyl, Fabric Cleaner, Stain Remover, Restorer - Product Availability
• 10112769Mar 2, 2016Equipment. This informational bulletin provides information on Battery Testing and Warranty Replacement Requirements (North America ONLY)
• 10113889Mar 1, 2016Equipment. This Preliminary Information communication provides the technician with a list of modules to check for communication with the scan tool, if the navigation radio does not display the current Hybrid mode. Dealer will use a scan tool to check communication with Accessory Direct current Power Control Module, Air Condition control module, Drive Motor Generator Power Inverter Module, Engine Control Module, Battery Energy…
• 10113888Mar 1, 2016Engine. This Preliminary Information communication provides steps the technician will uses to diagnose and repair vehicles that have low oil pressure after an oil change with the engine Regular Production Option Code L20, L77, L94, L96, L99, L9H, LC8, LC9, LH9, LMF, LMG, LY6, or LZ1. Vehicle may have Service Engine Soon lamp with Diagnostic Trouble Code P0521 or Low Oil Pressure message on the instrument panel. Dealer will…
• 10112764Mar 1, 2016Equipment. This warranty informational bulletin provides a list of all the required operating procedures and explains them out to what is acceptable and not.
• 10114443Feb 27, 2016Fuel system. This Preliminary Information communication provides information to the technician about vehicles that have an inaccurate fuel gauge. Technician should drive the vehicle to duplicate the concern. The fuel gauge will have a tendency to falsely indicate a lower fuel level than what is actually present. The fuel gauge will take a few minutes to show the correct fuel level. On vehicles equipped with an automatic…
• 10116914Feb 23, 2016Tires, Wheels. This informational bulletin provides information on the proper mounting paste to apply to tires when mounting and balancing them to prevent conditions like Vibration Shortly After Tires are Mounted/Preventing Vibration from Wheel Slip (Tire Sliding on Wheel)
• 10114431Feb 23, 2016Equipment. This Preliminary Information communication provides information to the technician about vehicles that may have an issue when using Bluetooth voice recognition with an iPhone. Technician should work with the customer to insure the phone contacts to not have any Emojis loaded to any contact.
• 10096141Feb 18, 2016Equipment. This preliminary information communication provides information to the technician about vehicles that may have an outside air temperature inoperative. To perform an instant update of the ambient temperature sensor, press and hold the recirc button and air conditioning button on the heater-vent-air conditioning control head simultaneously. It is also possible to perform this by using a scan tool in special function…
• 10116891Feb 12, 2016Equipment. This informational bulletin provides information on Clarification of Use - Dealer Empowerment Labor Operations and Customer Enthusiasm (U.S. Only)
• 10116890Feb 12, 2016Exterior lighting. This informational bulletin provides an out line on Headlamp, Tail Lamp, License Lamp or Fog/Driving Lamp Damage and what should be considered warranty replacement and not
• 10116888Feb 11, 2016Equipment. This informational bulletin provides information on Unscheduled Supplemental Services (Including Flushing Services and Additives) and Proper Use of GM Simplified Maintenance Schedules (U.S. Only)
• 10096026Feb 11, 2016Equipment. This preliminary information communication provides information to the technician about finding needle bearings during an oil change. Technician will gain access to the roller rockers to inspect them. Only replace the roller rocker that is missing needle bearings. Be sure to clean the oil drains to retrieve the needle bearings. Each roller rocker has 66 bearings.
• 10116878Feb 9, 2016Electrical system, Equipment. This informational bulletin provides Information on Inappropriate Warranty Claims Submitted for Damaged Radios and Instrument Panel Clusters (IPCs)
• 10116874Feb 8, 2016Exterior lighting. This informational bulletin provides information on exterior lamp condinsation and replacement guidelines
• 10116871Feb 5, 2016Equipment. This informational bulletin provides information on how to properly repair rust on the hem flange on doors for vehicles that have the condition of rust showing at hem flange
• 10116863Feb 1, 2016Equipment. This informational bulletin provides information on Behavior of Non-Upgraded OnStar Equipped Vehicles Operating in Canada after Decommissioning of 2G CDMA Cellular Networks
• 10112299Jan 27, 2016Equipment. This informational bulletin provides information on Part Restriction and Ordering Process Information for OnStar Vehicle Communication Interface Modules (VCIM) (GMNA Only)
• 10114364Jan 26, 2016Equipment. This Preliminary Information communication provides information to the technician about vehicles that may have Service Engine Soon and a Diagnostic Trouble Code P0011. If the technician has followed Service Information Diagnostic Trouble Code for P0011and the root cause was not found the oil pressure at the oil pressure sender should be checked. Also the number 2 cam bearing should be inspected.
• 10112287Jan 25, 2016Steering. This preliminary informational bulletin provides a procedure to apply dielectric grease and a piece of adhesive shim stock to the steering angle sensor connector to correct a condition of service stabilitak message displayed in DIC and DTC C0455 or C0710
• 10112278Jan 19, 2016Steering. This technical bulletin provides a procedure to flush and bleed the power steering system to correct a condition of power steering noise or fluid leak from power steering pump, gear or high pressure hose during extreme low temperature conditions.
• 10112272Jan 14, 2016Engine. This informational bulletin provides information on close coupled converters and there affect on newly installed engines or engines during there break in period.
• 10246963Jan 13, 2016Equipment. Changing Turn-By-Turn Voice Response To Metric Or English Units
• 10112264Jan 7, 2016Body and structure. This informational bulletin provides information on removing paint stains on the under side of protective shipping film
• 10114998Dec 22, 2015Engine, Equipment. This Preliminary Information communication provides information to the technician about vehicles with Service Engine Soon Malfunction Indicator Lamp. Technician may find Diagnostic Trouble Code P0101. Technician should follow published Service Information diagnostics for any Diagnostic Trouble Codes that are set.
• 10114980Dec 18, 2015Equipment. This Preliminary Information communication provides information to the technician about vehicles that when dialing certain numbers using OnStar Hands-free Calling, the audio is distorted or has poor quality after performing the OnStar Canada Upgrade. Dealer should communicate to the customer that we apologize for this inconvenience and that General Motors is working on a solution for this concern.
• 10114977Dec 18, 2015Equipment. This Preliminary Information communication provides information to the technician about what XM offerings are available for vehicles. A dealer or customer can access the website listed below for vehicle specific XM offerings and availability.
• 10114969Dec 15, 2015Engine cooling, Equipment. This Preliminary Information communication provides additional information to the technician when replacing the Duramax Diesel head gasket. This is a supplement to procedure found in Service Information. The left and right cylinder head gaskets are not interchangeable and will block oil and coolant passages if installed incorrectly resulting in severe damage to the engine.
• 10114964Dec 14, 2015Electrical system. This Preliminary Information communication advises the technician certain accessories are being made available through the Integrated Business Partner. For detailed manufacturer warranty information, technical support, or for possible product defects refer to the Electronic Parts Catalog part listing for contact information to contact the appropriate supplier.
• 10114954Dec 9, 2015Fuel system, Engine cooling. This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp. Technician may find Diagnostic Trouble Code P0442. Technician will need to review Techlink article from May 2013 titled "Using the Evaporative Emissions System Tester" Technician will need to follow these steps to help diagnose the issue. First after the P0442…
• 10201115Dec 1, 2015Equipment, Other or unknown. OnStar Voice Fallback Number Update
• 10201098Dec 1, 2015Transmission and drivetrain, Engine. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
• 10190512Dec 1, 2015Equipment, Electrical system. OnStar® Voice Fallback Number Update Some customers may have received a letter from OnStar® stating that "We recently tried to provide a software update to the OnStar® hardware in your vehicle. However, your system could not be updated remotely.
• 10190503Dec 1, 2015Engine, Transmission and drivetrain. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
• 10137258Nov 30, 2015Equipment. This informational bulletin provides information for technicians on the reuse of fasteners and the proper reading of torque specifications.
• 10115143Nov 30, 2015Engine cooling. This Preliminary Information communication provides information to the technician about gasoline powered cars, mid-size trucks, light duty trucks, and heavy duty trucks with premature catalytic converter failures. It is recommended to inspect for a poor crimp on the grounds ring terminal at the engine block for the bank with the concern and repair the wire.
• 10137255Nov 25, 2015Tires, Wheels. This informational bulletin provides additional information to the technician on how to check for Tire Radial Force Variations and the difference between balancing a flange and flangeless rim.
• 10115137Nov 25, 2015Fuel system. This Preliminary Information communication provides information to the technician about vehicles that may have a bump feel or clunk noise at a stop or on launch. Dealer should communicate to the customer this condition is a normal operating characteristic of their vehicle. The bump clunk issue may be due to fuel movement in the fuel tank when not completely full. The condition is eliminated after completely filling…
• 10137250Nov 23, 2015Equipment. This preliminary informational bulletin provides repair information to correct a customer concern of poor radio hands-free voice recognition performance or sound quality after OnStar upgrade.
• 10115128Nov 23, 2015Equipment. This Preliminary Information communication provides information to the technician about vehicle's odometer appears to be inaccurate relative to a known distance traveled. Technician should obtain a hand-held GPS unit to test the odometer. If a hand held GPS unit is not available, the only other option is to verify the miles traveled using a surveyor's wheel or a dynamometer.
• 10137249Nov 20, 2015Equipment. This informational bulletin provides information on a GM of Canada OnStar cellular communication upgrade.
• 10137246Nov 20, 2015Equipment. This informational bulletin provides information on a GM of Canada OnStar cellular communication upgrade.
• 10137237Nov 12, 2015Electrical system. This warranty administration bulletin adds the 2016 model year to a communication which provides dealership personnel revised wiring repair labor operations and required additional information.
• 10137235Nov 12, 2015Exterior lighting. This informational bulletin provides technicians with information on available BCM calibrations to restore bulb outage detection on vehicles produced by a second stage manufacturer (Upfitter), and/or turn signals flash fast after factory box removed.
• 10115093Nov 4, 2015Fuel system, Other or unknown. This Preliminary Information communication provides information to the technician about a customer?s request to remove or disable the Bi-Fuel Compressed Natural Gas system. General Motors does not condone the removal of the original equipped Compressed Natural Gas systems.

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