2012 GMC Sierra Denali Technical Service Bulletins

1,703 technical service bulletins (TSBs) are on record for the 2012 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.

• 10112917Mar 15, 2013Electrical system. This Preliminary Information communication advises the technician that 2-Mode Drive Motor Generator Battery will be placed on a parts restriction through the General Motors Technical Assistance Center. Dealer will need to contact General Motors Technical Assistance Center for further assistance.
• 10112901Mar 14, 2013Transmission and drivetrain, Engine cooling. This Preliminary Information communication provides information to the technician about vehicles that will not move in forward or reverse. Technician may find Diagnostic Trouble Code P0701 P0729 P0731 P0732 P0733 P0734 P0735 P0751 P0756 P0761 P0877 Or P2723 set. Technician will need to inspect the valve body separator plate orifices for debris.
• 10134652Mar 11, 2013Equipment. This informational bulletin provides information on fix it right for first time issues.
• 10134649Mar 7, 2013Fuel system. This preliminary information bulletin provides a procedure for installing a zip tie for the fuel level sensor to correct the fuel gauge intermittently not reading full when the fuel tank is filled.
• 10134646Mar 5, 2013Transmission and drivetrain. This preliminary information bulletin provides a procedure to adjust the transmission dipstick tube and/or install the transmission fluid filler tube sleeve to eliminate a tick, buzz or rattle noise from the front of dash, transmission filler tuber cracked or broken.
• 10112893Mar 5, 2013Equipment. This Preliminary Information communication provides information to the technician about vehicles that have an intermittent Diagnostic Trouble Code P0340. Technician will need to replace the cam position sensor to correct this Diagnostic Trouble Code P0340 concern.
• 10134644Mar 4, 2013Steering. This preliminary information bulletin provides a procedure to eliminate a whine noise that varies with engine speeds.
• 10134643Mar 4, 2013Engine cooling. This preliminary information bulletin provides a procedure to re-align the exhaust pipe and replace the gasket to eliminate an exhaust leak or vibration/rattle noise heard approximately 900 RPM, fuel smell, white smoke, oily substance on the exhaust downpipe.
• 10134640Mar 4, 2013Wheels. This informational bulletin provides information on the appearance of chromed aluminum wheels due to chemical staining, pitting corrosion and/or spotted.
• 10254207Mar 1, 2013Engine cooling, Electrical system. No Crank/No Start, Dead Battery Due to Parasitic Drain/Discharge.
• 10247677Mar 1, 2013Electrical system. High Voltage 2-Mode Battery Parts Restriction-TAC.
• 10245804Mar 1, 2013Equipment. Aftermarket ALDL or DLC Interface Devices Causing Multiple Issues
• 10245316Mar 1, 2013Electrical system. High Voltage 2-Mode Battery Parts Restriction-TAC.
• 10112887Feb 26, 2013Transmission and drivetrain. This Preliminary Information communication provides information to the technician about vehicles that may have a ticking noise when driving above 30 miles per hour in third and fourth gear. Technician will need to replpace the Reaction Carrier, Low and Reverse Roller Clutch Race, and the Low and Reverse Roller Clutch.
• 10112885Feb 26, 2013Equipment. This Preliminary Information communication advises the technician that a noise or a vibration in the vehicle that seems to be abnormal may not have been there when the vehicle was purchased. Technician should look for Non - General Motors aftermarket accessories installed on the vehicle that can cause these issues.
• 10112877Feb 22, 2013Engine cooling. This Preliminary Information communication provides information to the technician about vehicles that have a service four wheel drive message displayed in the driver?s information center. Technician may find Diagnostic Trouble Code C0387. Technician should follow published Service Information diagnostics for the Diagnostic Trouble Code if it is a current code. Technician will need to attempt to duplicate the…
• 10112876Feb 21, 2013Equipment. This Preliminary Information communication provides information to the technician about vehicles that have a service 4 wheel drive message displayed in the driver?s information center. Technician will find Diagnostic Trouble Code C0306, C0321, C0398, C0396, and C0569. Technician should inspect the terminal at X109 and X3 for proper tension, crimp, fully seated and overall condition.
• 10112872Feb 20, 2013Vehicle speed control, Electrical system, Body and structure. This Preliminary Information communication provides information to the technician about vehicles that have Diagnostic Trouble Code B2555 may be found in a Driver and/or Passenger Door Module. Technician should ignore the Diagnostic Trouble Code if set in a driver door module and/or Passenger Door Module on a vehicles not equipped with front door panel courtesy lights.
• 10112864Feb 18, 2013Body and structure. This Preliminary Information communication provides information to the technician about vehicles that may have slack in one of the tailgate cables. Technician should not replace any parts for this concern. Please communicate to the customer this condition is a normal operating characteristic of their vehicle.
• 10112862Feb 15, 2013Transmission and drivetrain, Electrical system. This Preliminary Information communication provides information to the technician about vehicles that have a surge or stall when in gear at a stop. Technician will find Diagnostic Trouble Code P0742. Technician will need to isolate if the concern is transmission internal or external. Technician will need to disconnect the 20 way connector at the transmission (C-175 for model years 2001 ? 2007 and X-175 for model…
• 10112857Feb 13, 2013Electrical system. This Preliminary Information communication advises the technician that, when testing any circuit for open or resistance, it is imperative that all related terminal pin fit and tension be checked when the test steps require disconnection of the connector or component, prior to any component replacement. Always use the recommended terminal test tool during these tests.
• 10112845Feb 5, 2013Transmission and drivetrain. This Preliminary Information communication provides information to the technician about vehicles that have no forward or reverse. Technician will need to check for metal debris in torque converter clutch valve.
• 10112844Feb 5, 2013Electrical system, Engine, Exterior lighting. This Preliminary Information communication provides information to the technician about vehicles that have Service Engine Soon Malfunction Indicator Lamp and the engine misfires. Technician may find Diagnostic Trouble Codes P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, and P0308. Technician will need to inspect the spark plug wires. Technician will need to replace any loose spark plug wires.
• 10112842Feb 4, 2013Engine, Engine cooling. This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have a Service Engine Soon Malfunction Indicator Lamp on at low mileage. Technician may find Diagnostic Trouble Codes P0420 and or P0430 stored. Technician should be advised that the catalytic converter efficiency Diagnostic Trouble Codes P0420 and P0430 are disabled for the first…
• 10247756Feb 1, 2013Electrical system, Body and structure. Driver or Passenger Door Module DTC B2555.
• 10245777Feb 1, 2013Electrical system, Engine, Other or unknown. New Service Cam Bearings For Gen IV V8 Engines
• 10112837Feb 1, 2013Brakes. This Preliminary Information communication provides information to the technician about vehicles that a driveline noise or vibration at various speeds and operating conditions. Technician should be advised that the vehicle should always be restored to a factory configuration when diagnosing noise and vibration concerns.
• 10112836Feb 1, 2013Engine cooling, Electrical system. This Preliminary Information communication provides information to the technician about vehicles that have a Diagnostic Trouble Code C0569 that will not clear. Technician should be advised if there are any issues with the rotational position sensor, incremental position sensor, encoder motor, motor A or B circuits, rotational position sensor or incremental position sensor circuits when the transfer case control…
• 10112763Jan 31, 2013Equipment. This Preliminary Information communication provides information to the technician about vehicles that have a cold air leak on the front passenger side while driving. Technician will need to use black RTV silicone and apply over the seam between the upper and lower Heater-Vent-Air Conditioning case halves.
• 10112745Jan 30, 2013Back-over prevention (rear camera), Equipment. This Preliminary Information communication provides information to the technician that during the Pre-Delivery Inspection it may be noticed that the backup alarm is inoperative. Technician can locate the wire harness on the right rear of the frame. Technician can route the harness up and over the spare tire hoist tube and connect to the backup alarm.
• 10112744Jan 29, 2013Engine, Fuel system. This Preliminary Information communication advises the technician that 2013 6.6L Duramax Diesel Engine Regular Production Option Code (LGH and LML) part number 12638502 will be placed on a parts restriction through the General Motors Product Quality Center. Dealer will need to contact General Motors Product Quality Center for further assistance.
• 10133152Jan 28, 2013Equipment. This informational bulletin provides information on the replacement process for the product quality center.
• 10133151Jan 28, 2013Transmission and drivetrain. This informational bulletin provides information for service agents not required to contact product quality center for CNG, LPG or gasoline engine, transmission and/or transfer case.
• 10133149Jan 28, 2013Electrical system. This technical bulletin provides a procedure on suspected tampering due to aftermarket ALDL or DLC interface devices causing multiple issues.
• 10133147Jan 28, 2013Tires. This informational bulletin provides information on tire radial force variation.
• 10133146Jan 28, 2013Visibility (wipers, defrost, mirrors). This technical bulletin provides a procedure for adding double sided tape on the right and left windshield side reveal moldings to remove tapping, clicking or ticking type noise.
• 10133145Jan 28, 2013Body and structure. This informational bulletin provides information on the body mount bolt being stripped or will not loosen.
• 10133143Jan 25, 2013Electrical system. This informational bulletin provides information on suspected tampering on vehicles modifications for identifying non GM ECM calibrations.
• 10133142Jan 25, 2013Electrical system. This informational bulletin provides information suspected tampering on vehicles modifications for identifying non GM ECM calibrations.
• 10133136Jan 23, 2013Back-over prevention (rear camera), Vehicle speed control. This preliminary informational bulletin provides information on dignostics for a whine noise at varies engine speeds.
• 10112737Jan 23, 2013Electrical system. This Preliminary Information communication provides information to the technician about vehicles that the speedometer needle appears to be inaccurate. Dealer should advise the customer the specification for speedometer needle accuracy is +/- 2 miles per hour at any given speed when looking straight at the needle.
• 10112734Jan 22, 2013Engine cooling. This Preliminary Information communication advises the technician that vehicles with engine Regular Production Option Code LGH or LML may have an Exhaust Fluid Quality Poor message displayed on the Driver Information Center. Technician will need to complete the current Service Information diagnostic for any current Diagnostic Trouble Codes or symptoms found.
• 10112733Jan 22, 2013Fuel system. This Preliminary Information communication provides information to the technician that engineering is asking for additional information if SI diagnosis leads to replacement of the Indirect Fuel Injector for a P0420 Diagnostic Trouble Code. Technician should follow published Service Information diagnostics for Diagnostic Trouble Code P0420.
• 10133130Jan 16, 2013Body and structure. This informational bulletin provides information pre-painting/cleaning process for TPO plastic fascias.
• 10133128Jan 16, 2013Equipment. This informational bulletin provides information on mounting points for the pickup box accessories.
• 10112725Jan 16, 2013Engine. This Preliminary Information communication provides information to the technician about vehicles that have misfires on cylinders 1, 4, 6 and 7. Technician should inspect the camshaft part numbers. Technician should ensure to use part number for the application by using the numbers stamped on the cam.
• 10112723Jan 16, 2013Engine cooling, Fuel system. This Preliminary Information communication provides information to the technician about vehicles that the scan tool reading showing varying diesel particulate filter soot mass readings on a 2012 Silverado or Sierra. Technician should check the Tech 2's software version if the version is 31.00 the scan tool will need to be updated.
• 10133125Jan 14, 2013Equipment. This informational bulletin provides information on a update for the Electronic Component Exchange Program (U.S. and Canada Only)
• 10112717Jan 14, 2013Electrical system, Engine cooling. This Preliminary Information communication provides information to the technician about vehicles that have a rough idle and/or momentary lack of power after cold starting the engine and immediately placing the transmission in gear. Technician should follow published Service Information diagnostics first. Dealer should communicate to the customer this condition is a normal operating characteristic of their vehicle.
• 10112716Jan 14, 2013Transmission and drivetrain. This Preliminary Information communication provides information to the technician about vehicles that may have a ticking noise when driving above 30 miles per hour in third and fourth gear. Technician will need to replpace the Reaction Carrier, Low and Reverse Roller Clutch Race, and the Low and Reverse Roller Clutch.

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