Check timing, means exactly that. Check your timing marks on the cam gear in relation to the crank gear. If the timing is out of sync, check your cam/crank sensors, or anything else the specific trouble code suggests you inspect for possible faults.

Keep in mind this is predominantly a 420a forum, with less support for the 4g6X platforms.

We will help where we can, but you might have better support on a dedicated forum for your platform.

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2012 2500HD LML