DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
- 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.