Cadillac P1643: Engine Speed (RPM) Output Circuit Malfunction
Is your scanner showing Cadillac P1643?
No worries. We'll show you what it means and how to deal with it.
Cadillac P1643: Engine Speed (RPM) Output Circuit Malfunction
OVERVIEWWhat Does The Cadillac P1643 Code Mean?
Engine started, engine speed over 600 rpm, and the PCM detected the commanded state of Engine Speed signal driver and Actual state of the driver did not match for 25.5 seconds.
What Are The Potential Causes Of The Cadillac P1643 Code?
Below are some potential causes of this DTC:
- Engine speed signal circuit is open, shorted to ground or to B+
- Instrument Cluster 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
>>> BPR Instrument Cluster Compatible with 2003-2004 Cadillac Escalade
>>> 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!
