Chevrolet P1642: Fan Control Relay 2/3 Control Circuit Malfunction
Is your scanner showing Chevrolet P1642?
No worries. We'll show you what it means and how to deal with it.
Chevrolet P1642: Fan Control Relay 2/3 Control Circuit Malfunction
OVERVIEWWhat Does The Chevrolet P1642 Code Mean?
DTC P1640 not set, engine started, engine runtime 10 seconds, and the PCM detected the commanded state of the FC Relay 2/3 driver and Actual state did not match for 5 seconds.
What Are The Potential Causes Of The Chevrolet P1642 Code?
- Fan relay control circuit is open, shorted to ground or to B+
- Fan relay power circuit is open (check the FAN fuse)
- Fan relay is damaged or has failed
- 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
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.
