Possible Causes
Possible causes are:
- Vacuum supply.
- EGR valve stuck closed.
- EGR valve leaks vacuum.
- EGR flow path restricted.
- EGRVR circuit shorted to power.
- VREF open to DPF EGR sensor.
- DPF EGR sensor downstream hose off or plugged.
- EGRVR circuit open to PCM.
- VPWR open to EGRVR solenoid.
- DPF EGR sensor hoses both off.
- DPF EGR sensor hoses reversed.
- Damaged EGR orifice tube.
- Damaged EGRVR solenoid.
- Damaged PCM.