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P1685 Diagnostic Trouble Code Discussion for August 2017

Transmission Control Module Power Up Temperature Sensor Circuit Low


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Trouble Ticket Help Requests for DTC P1685
Help Request Posted
2001 Jeep Grand Cherokee Laredo 4.0L No Start, MIL Lamp on VIN: 1J4GW48S91
P1685: Smart Key Immobilizer Module Invalid Key. The truck came in with trans temp and o/d lights on because of the trans temp sensor value that was a bad pcm. We are trying to enter the skim code and it keeps coming back as invalid number. We can't get a pcm from jeep and have tried 2 A1 pcm's and 2 used pc...
August 09, 2017