P0405
EGR Sensor A Circuit Low
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 p0405 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Low voltage from the EGR position sensor A.
Symptoms
- Check Engine Light
- EGR control issues
Common Causes
- Short to ground in sensor circuit
- Faulty sensor
- Wiring damage
Diagnostic Steps
- Test sensor voltage
- Check for shorts
- Inspect wiring
Repair Notes
Repair wiring or replace EGR valve (sensor often integrated).
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
P0405 on Other Vehicles
Common Questions
What does code P0405 mean on a 2007-2007 Cadillac CTS?
P0405 stands for "EGR Sensor A Circuit Low". Low voltage from the EGR position sensor A.
What are the symptoms of P0405 on a Cadillac CTS?
Common symptoms of P0405 include: Check Engine Light, EGR control issues.
What causes P0405 on a 2007-2007 Cadillac CTS?
Common causes of P0405 include: Short to ground in sensor circuit, Faulty sensor, Wiring damage.
Last updated: March 2026