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P1685 Diagnostic Trouble Code Discussion for December 2011

Transmission Control Module Power Up Temperature Sensor Circuit Low

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Trouble Ticket Help Requests for DTC P1685
Help Request Posted
1999 Jeep Grand Cherokee Laredo 4.0L MIL Lamp on VIN: 1J4GW58S0X
P1685: Smart Key Immobilizer Module Invalid Key. ... they say nothing wrong with the car. the car just start and die p1685 on the pcm dealer program a new key saying that will take care that. when that happens sometimes no computers on the bus however from 0 to 2.5 v on pin 2 of the dlc connector. question i...
December 05, 2011