Chevrolet P1664: Skip Shift 1-4 Upshift Lamp Control Circuit Malfunction
Is your scanner showing Chevrolet P1664?
No worries. We'll show you what it means and how to deal with it.
Chevrolet P1664: Skip Shift 1-4 Upshift Lamp Control Circuit Malfunction
OVERVIEWWhat Does The Chevrolet P1664 Code Mean?
Engine started, engine speed over 600 rpm, and the PCM detected the Actual state and the Commanded state of the Skip Shift Lamp control circuit did not match during the CCM test.
What Are The Potential Causes Of The Chevrolet P1664 Code?
- Skip shift lamp control circuit is open, shorted to ground or to system power (B+)
- Skip shift lamp power circuit is open (check the GAGES fuse)
- Skip shift lamp (bulb) is open or missing (check in the IPC)
- 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.
