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[GMC 2500]

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Diagnostic Aids

Intermittent DTCs (P0251, P0370 and P1216) may be caused by air entering the fuel system when

fuel levels get below 1/8 of a tank while performing hard acceleration or turning maneuvers. It's also

possible that a P0251, P0370 and P1216 will set the if vehicle has run out of fuel. Customer driving

habits should be checked to determine if the vehicle has been performing in these manners. If the

vehicle has been performing in these conditions, bleed the fuel system of all air and test drive the

vehicle.

When the PCM is in backup fuel, fast idle and poor performance problems will exist.

An intermittent condition can be caused by the following:


Poor connections.


Rubbed through wire insulation.


Broken wire inside the insulation.