Chevrolet P1640: Output Driver Module 'A' Circuit Malfunction
Is your scanner showing Chevrolet P1640?
No worries. We'll show you what it means and how to deal with it.
Chevrolet P1640: Output Driver Module 'A' Circuit Malfunction
OVERVIEWWhat Does The Chevrolet P1640 Code Mean?
Engine started; brakes pedal not applied, and the PCM detected an unexpected voltage condition on the ODM A fault line for 5 seconds during the CCM test. The controls to the EVAP, Fan Control and TCC Solenoid may not work if this code is set.
What Are The Potential Causes Of The Chevrolet P1640 Code?
- EVAP solenoid control circuit open, shorted to ground or to B+
- Fan relay 2 control circuit is open, shorted to ground or to B+
- TCC solenoid control circuit is open, shorted to ground or to B+
- PCM has failed
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> GM Genuine Parts 12633238 Engine Control Module
>>> GM AT Torque Converter Clutch Pulse Width Modulation Valve
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
GM, 2013, Service Bullettin – Prior To Any Circuit Testing.
