Cadillac P1633: Ignition Supplement Power (0) Switch Circuit Malfunction
Is your scanner showing Cadillac P1633?
No worries. We'll show you what it means and how to deal with it.
Cadillac P1633: Ignition Supplement Power (0) Switch Circuit Malfunction
OVERVIEWWhat Does The Cadillac P1633 Code Mean?
Key on, Class 2 serial data received normally, and the PCM detected an improper Supplement Power Circuit (Circuit 0) voltage. The PCM receives two ignition switch IGN 0 and IGN 1 inputs. It also receives a Class II message from the power mode master (PMM).
What Are The Potential Causes Of The Cadillac P1633 Code?
Below are some potential causes of this DTC:
- Ignition OFF/RUN/CRANK circuit is open or shorted to power
- Ignition switch 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 Ignition Switch
>>> 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!
