2012 GMC Sierra 1500 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2012 GMC Sierra 1500

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2012 GMC Sierra 1500 Problems

Service 4WD Message May be Displayed

The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will be of assistance in determining the exact fault causing the message to be displayed.

Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator

One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

Erratic Fuel Gauge Operation

It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pump module replaced on high mileage vehicles.

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2012 GMC Sierra 1500 Questions

Lights will not go off (1 answer)

The power outlet fuse blew, we replaced it, now the only one out of 4 work (1 answer)

The only one that works now is the one closest to the driver.

How much damage from driving w/unfiltered air for btw 10 and 1500 miles? (1 answer)

Had a DTC code P0171 and P0174 pop today, OnStar said I should be safe to drive home. Codes corresponded to running lean on both banks. Got home and checked it out and found the intake tube from the AiRaid Jr kit had become disconnected at the rubber elbow between the tube and the stock intake ...

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2012 GMC Sierra 1500 Recalls

Ignition Switch

The ignition switch actuator can bind causing the ignition switch to stick in the "start" position. If this were to occur the actuator can unexpectedly release, cause the ignition switch to snap back into the "Accessory" position. This would cause the engine to turn off with an associated loss of brake and steering power assist. If these conditions were to lead to a crash the airbags may not deploy as expected. Dealers will inspect and replace the ignition lock housing as necessary to correct this concern.

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2012 GMC Sierra 1500 Reviews

Rated
based on 1 customer reviews
Bought used with 47201 on odometer, runs great, look great, really happy with my purchase. Only thing had to replace was the right passenger headlight bulb.

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