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2012 GMC Sierra 3500 HD Problems

RepairPal has identified the most common problems with the 2012 GMC Sierra 3500 HD based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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1
Known Problem

The GMC Sierra 3500 HD uses a throttle position sensor (TPS) which commonly fails and causes:

This issue is related to the throttle position sensor, and can be caused by faulty wiring to the TPS, bad connection at the TPS, or a failed TPS.

To correct this issue, the wiring harness, connector, and throttle position sensor must be inspected, tested, and/or replaced. The most common cause is a faulty TPS.