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P1638 Diagnostic Trouble Code Discussion for August 2011

TCM Internal - CAN 1 RAM Performance

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Trouble Ticket Help Requests for DTC P1638
Help Request Posted
1997 Jaguar XK8 4.0L Won't turn off VIN: SAJGX2748V
P1638: Computer circuit malfunction. This car will not stop running when key is turned off and removed. I disconnected both the ignition switch and the inertia switch and it continues to run. When I switch key off, radio and climate control shut down but engine keeps running. I pulled the EMS rel...
August 08, 2011