P0403
EGR Control Circuit
2007-2007 Cadillac CTS 3.2L V6
Moderate SeverityPowertrainGeneric (SAE)
The 2007 Cadillac CTS is equipped with a 3.2L V6 engine. Below you'll find detailed p0403 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the EGR valve control circuit (electrical EGR valves).
Symptoms
- Check Engine Light
- EGR not functioning
- Increased emissions
Common Causes
- Faulty EGR valve
- Wiring damage
- PCM driver failure
- Corroded connector
Diagnostic Steps
- Test EGR valve solenoid resistance
- Check wiring
- Command EGR with scan tool
- Test PCM output
Repair Notes
Replace EGR valve or repair wiring.
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
P0403 on Other Vehicles
Common Questions
What does code P0403 mean on a 2007-2007 Cadillac CTS?
P0403 stands for "EGR Control Circuit". Malfunction in the EGR valve control circuit (electrical EGR valves).
What are the symptoms of P0403 on a Cadillac CTS?
Common symptoms of P0403 include: Check Engine Light, EGR not functioning, Increased emissions.
What causes P0403 on a 2007-2007 Cadillac CTS?
Common causes of P0403 include: Faulty EGR valve, Wiring damage, PCM driver failure, Corroded connector.
Last updated: March 2026