Possible Causes
Malfunction is detected when no EGR flow is detected under conditions that call for EGR. Possible causes are:
- EGR valve stuck closed.
- EGR Control Backpressure Transducer (EGRC-BPT) valve.
- Vacuum hose.
- EGRC solenoid valve.
- EGR passage.
- EGR temperature sensor.
- Exhaust gas leaks.
NOTE:
For best results, perform DTC confirmation test when ambient temperature is more than 41°F (5°C).