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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.

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Old 10-22-2017, 09:00 AM   #1 (permalink)
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4L80E no shift diagnosis

Hi, I'm new to Diesel place and doing threads so I hope you can bear with me. I've looked through the transmission posts but could not find the same problem I have. Here's the problem, went to use my 1993 TD and the service engine soon light stayed on after starting when I drove realized truck was in second gear with no shifting at all. Reverse is ok, did some research and tried changing the solenoids and pressure plate switch on the control valve, replaced the filter and refilled with new fluid . Same result still no shifting. Bought a code reader, S.E.S. light does not flash, pulled fuses and disconnected battery, reconnect start eng S.E.S. light comes on with key and never blinks or goes out. Do you have any suggestions or a good break down of schematics and test specs that I could review and continue to diag. this problem. Your input/ experience would be appreciated Thank you

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Old 10-22-2017, 09:03 AM   #2 (permalink)
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