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DTC Parameters

Condition exists for longer than 6 seconds.
Engine is running.

DTC P1640 will set if A/C relay, 1-2 shift solenoid, 2-3 shift solenoid or TCC solenoid feedback voltage is less than 4.0 volts when that device is commanded OFF; or if A/C relay, 1-2 shift solenoid, 2-3 shift solenoid or TCC solenoid feedback voltage is greater than 3.5 volts when that device is commanded ON.