P1633high severityPowertrain
Ignition Supply Power Circuit Low Voltage
on 2004 GMC Yukon 5.3L V8 Vortec · RWD
What this code means
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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1