2012 GMC Sierra 2500 HD Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2012 GMC Sierra 2500 HD

2012 GMC Sierra 2500 HD Questions

hole in tranny cooler replace it now it shifts hard and won't go in gear sometim (2 answers)

I put fluid back in but it shifts hard and on down shift also. And the engine will rev up but truck won't go sometimes, or it won't go into gear. The tranny temp says 168.put new tranny cooler on it cuz a rock went thru it and lost all my fluid.any info will b helpful

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2012 GMC Sierra 2500 HD 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.

The Fuel Gauge Reading May Be Incorrect

Vehicles equipped with a 6.6L diesel engine and dual fuel tanks are being recalled because the transfer pump that moves fuel from the rear tank to the front tank could cause the fuel gauge in show the incorrect fuel level. The engine could stall unexpectedly, increasing the risk of a crash. Dealers will inspect the fuel transfer pump and replace it as necessary to correct this concern. 

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