Ignition Supply Power Circuit Low Voltage
2000-2005 Cadillac DeVille 4.6L V8 Northstar 🇨🇦
Description
The PCM detected low voltage on its ignition supply power circuit. The ignition power circuit provides run/start voltage to the PCM.
Symptoms
- Check Engine Light
- Engine stalling
- Poor performance
- Intermittent no-start
- Multiple erratic codes
Common Causes
- Faulty ignition switch
- Loose ignition power connection
- Blown fuse
- Damaged wiring
- Corroded ignition switch connector
Diagnostic Steps
- Test voltage at PCM ignition power circuit
- Check ignition switch output
- Inspect ignition power fuse
- Test wiring for resistance
- Check connector at ignition switch
Repair Notes
Check ignition switch, fuse, and wiring. Replace ignition switch if voltage output is low.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1633 on Other Vehicles
Common Questions
What does code P1633 mean on a 2000-2005 Cadillac DeVille?
P1633 stands for "Ignition Supply Power Circuit Low Voltage". The PCM detected low voltage on its ignition supply power circuit. The ignition power circuit provides run/start voltage to the PCM.
What are the symptoms of P1633 on a Cadillac DeVille?
Common symptoms of P1633 include: Check Engine Light, Engine stalling, Poor performance, Intermittent no-start, Multiple erratic codes.
What causes P1633 on a 2000-2005 Cadillac DeVille?
Common causes of P1633 include: Faulty ignition switch, Loose ignition power connection, Blown fuse, Damaged wiring, Corroded ignition switch connector.