Car Problem Reports

GMC Suburban 2500 Transmission fluid leaking, erratic shifting

GMC Suburban 2500 Problem
3 Reports
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Model Years Affected: 1992, 1993, 1994

Drive Train Affected: 4WD


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.

  • Visitor, , 4WD, 176,000 mi

    The transmission only shifts past 2nd sometimes. We took it and had the codes pulled and they came back with TCC error, TCS circuit, trans code low gear ratio and trans code high gear ratio. We took it to a tranny shop and they drove it and looked it over and said it was in pretty good shape for a 94 with 176000 miles on it. Of course while they drove it the truck shifted fine. So now we are stuck trying to figure out exactly what is wrong and how to fix it.

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