Ignition Supply Power Circuit Low Voltage
2014-2014 Cadillac SRX 3.0L V6
The 2014 Cadillac SRX is equipped with a 3.0L V6 engine. Below you'll find detailed p1633 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
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 2014-2014 Cadillac SRX?
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 SRX?
Common symptoms of P1633 include: Check Engine Light, Engine stalling, Poor performance, Intermittent no-start, Multiple erratic codes.
What causes P1633 on a 2014-2014 Cadillac SRX?
Common causes of P1633 include: Faulty ignition switch, Loose ignition power connection, Blown fuse, Damaged wiring, Corroded ignition switch connector.
Last updated: March 2026