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  1. Jimmy1985

    2002 lb7 has reverse but goes into limp mode in D

    2002 3500 lb7 with a Allison 1000 and I put all 3 new trans cooler lines on it from GM and started getting a p0872 transmission fluid pressure switch circuit C low code and MAP sensor code. Truck goes into limp mode when switching to (D). Changed map sensor and trans fluid pressure sensor and...