2012 GMC Sierra 1500 Service and Repair Manual
2012 GMC Sierra 1500 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
- WT Crew Cab Pickup 4-Door
- XFE Crew Cab Pickup 4-Door
- SLT Crew Cab Pickup 4-Door
- WT Extended Cab Pickup 4-Door
- SLE Extended Cab Pickup 4-Door
- Hybrid Crew Cab Pickup 4-Door
- SL Crew Cab Pickup 4-Door
- SL Extended Cab Pickup 4-Door
- Denali Crew Cab Pickup 4-Door
- SLE Crew Cab Pickup 4-Door
- SLT Extended Cab Pickup 4-Door
- WT Standard Cab Pickup 2-Door
- SLE Standard Cab Pickup 2-Door
Engines covered
- 5.3L 5328CC 325Cu. In. V8 FLEX OHV Naturally Aspirated
- 4.3L 262Cu. In. V6 GAS OHV Naturally Aspirated
- 4.8L 294Cu. In. V8 FLEX OHV Naturally Aspirated
- 6.2L 6162CC 376Cu. In. V8 FLEX OHV Naturally Aspirated
- 6.0L 5967CC 364Cu. In. V8 FULL HYBRID EV-FLEX (FHEV) 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
General Motors, LLC (GM) is recalling certain 2012 Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500/3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 250
An inflator explosion may result in sharp metal fragments striking the driver or other occupants, re
GM will notify owners, and dealers will replace the front passenger air bag inflator with an alterna
General Motors, LLC (GM) is recalling certain 2014 Cadillac Escalade, Escalade ESV, Chevrolet Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 2500, Sierra 3500, Yukon, and Yukon XL vehicle
An inflator explosion may result in sharp metal fragments striking the driver or other occupants, re
GM will notify owners, and dealers will replace the front passenger air bag inflator with an alterna
This preliminary information communicates information about how to determine if a wheel and tires size change is available.
This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
This PI Communications information on an alternative product dealers can use to perform 19-NA-255: Wax Coating on Frame Peeling, Metal Shows Corrosion/Rusting due to issue with getting product from current supplier listed in the bulletin.
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
This service bulletin provides information on Tire Sidewall Irregularities.
This service 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 remo
This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
Showing the 8 most recent of 624 technical service bulletins on file with NHTSA.
The contact owns a 2013 GMC Sierra. The contact stated that while driving at 70 MPH, she lost consciousness. After regaining consciousness, the contact discovered that the vehicle had crashed into tw
My passenger air bag deployed or went off as i was driving home from work and made such a loud noise that i crashed my 2012 GMC Sierra 1500. I was startled and scared and disoriented and others around
WHILE DRIVING THE TRUCK ON A COUNTRY ROAD, IT STARTED TO PULL TOWARDS THE RIGHT. I TRIED TO CORRECT BY STEERING TO THE LEFT. MY STEERING WHEEL JUST SPUN AND HAD NO CONTROL OF THE FRONT WHEELS. ITHE ST
WHILE DRIVING THE TRUCK ON A COUNTRY ROAD, IT STARTED TO PULL TOWARDS THE RIGHT. I TRIED TO CORRECT BY STEERING TO THE LEFT. MY STEERING WHEEL JUST SPUN AND HAD NO CONTROL OF THE FRONT WHEELS. ITHE ST
$17,000 WORTH OF DAMAGE ON MY GMC ALL AIRBAGS WENT OFF MINUS THE DRIVER SIDE STEERING WHEEL AIRBAG. WAS ON CRUISE CONTROL AT 75 MILES PER HOUR FELL ASLEEP AT WHEEL RAN INTO THE BARRIER WIRES. DAMAGE A
Showing the 5 most serious of 143 complaints filed with NHTSA.
