2012 GMC Sierra Service and Repair Manual

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Factory-Grade Data

2012 GMC Sierra service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Base Standard Cab Pickup 2-Door
  • Denali Crew Cab Pickup 4-Door
  • Base Crew Cab Pickup 4-Door

Engines covered

  • 5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated
  • 6.2L 6162CC 376Cu. In. V8 FLEX OHV Naturally Aspirated

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2012 GMC Sierra Recalls & Complaints

NHTSA #13V61500011/12/2013Component: FUEL SYSTEM, DIESEL

General Motors LLC (GM) is recalling certain model year 2012-2013 Chevrolet Silverado HD and GMC Sierra HD vehicles, equipped with 6.6L diesel engines and dual fuel tanks. In the affected vehicles, t

Consequence

If the fuel gauge indicates an inaccurate reading it may result in the vehicle unexpectedly stalling

Remedy

General Motors will notify owners and dealers will inspect and replace the fuel transfer pump, as ne

TSB #10114597

This Preliminary Information communication provides information to the technician of an engine power reduced message on the driver information center after performing the Canada Onstar 4G upgrade. If the concern is present park the vehicle

TSB #10114470

This Preliminary Information communication provides information to the technician about vehicle that may have an OnStar system that has progression tones when pressing the blue or red button. Technician will need to call General Motors Tech

TSB #10114408

This Preliminary Information communication provides information to the technician about vehicles that are travelling from Canada to the United States. While in the United States they are unable to receive Turn-by-Turn directions. Due to the

TSB #10114431

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 cont

TSB #10114342

This Preliminary Information communication provides information to the technician about vehicle that may have an OnStar system that has progression tones when pressing the blue or red button. Technician will need to call General Motors Tech

TSB #10114352

This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized, tested and designed fo

TSB #10114354

This Preliminary Information communication provides information to the technician that some vehicles may have a Service Engine Soon lamp, engine misfire on cylinder 1, 4, 6, or 7 and/or tick noise. Technician will follow service information

TSB #10114343

This Preliminary Information communication provides information to the technician the steps needed to diagnose and repair the vehicles that may have unwanted or phantom phone calls. Technician will need to determine what type of call the cu

Showing the 8 most recent of 275 technical service bulletins on file with NHTSA.

20151216Component: ELECTRICAL SYSTEMCrash reported

TL* THE CONTACT OWNS A 2012 GMC SIERRA. THE CONTACT STATED THAT THE VEHICLE EXPERIENCED A LOSS OF POWER WHICH RESULTED IN A FRONT END COLLISION WITH A GUARDRAIL. WHEN THE FAILURE OCCURRED, ALL THE WAR

20140723Component: SERVICE BRAKESCrash reported

PULLING INTO A PARKING SPOT IN A PARKING GARAGE GOING NO MORE THAN 3 MILES PER HOUR, OR HOWEVER FAST THIS VEHICLE CAN GO WHILE FOOT IS RESTING ON BRAKE, GETTING READY TO FULLY BRAKE. AS I PRESSED DOWN

20140723Component: ELECTRONIC STABILITY CONTROL (ESC)Crash reported

PULLING INTO A PARKING SPOT IN A PARKING GARAGE GOING NO MORE THAN 3 MILES PER HOUR, OR HOWEVER FAST THIS VEHICLE CAN GO WHILE FOOT IS RESTING ON BRAKE, GETTING READY TO FULLY BRAKE. AS I PRESSED DOWN

20130308Component: AIR BAGSCrash reported

TL* THE CONTACT OWNS A 2012 GMC SIERRA. THE CONTACT STATED THAT WHILE MAKING A RIGHT TURN, THE DRIVER FRONT AIR BAG ERRONEOUSLY DEPLOYED AND CAUSED THE CONTACT TO CRASH INTO A POLE. THE VEHICLE WAS DE

20120314Component: SUSPENSIONCrash reported

JUST PURCHASES NEW 2012 GMC SIERRA 3500 , 400 MILES , HAVE HAD ALIGNMENT / STEERING PROBLEMS WITH A DRIFT TO LEFT AND A WONDERING STEERING WHEEL, ALSO BRAKE AND ABS LIGHTS ON, WENT TO DEALER THEY LOOK

Showing the 5 most serious of 46 complaints filed with NHTSA.

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