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GMC 2500 Pickup Problems

Transmission Fluid Leak, Erratic Shifting on GMC 2500 Pickup

Problem Description and Possible Solution

On the 4L80-E Transmission (Diesel and 7.4L gas engine), Transmission fluid may leak through the electrical connector on the side of the transmission, damaging the wire harness and causing the transmission to shift erratically. Our technicians tell us there are updated shift solenoids, an internal  transmission harness, and a connector pigtail available to correct this fault.

(3 people reported this problem)

GMC 2500 Pickup Vehicles With This Problem

RepairPal Verified
Average mileage: (–)
3 model years affected: 1991, 1992, 1993
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Brake problem? Or maybe a faulty head gasket cylinder?
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