Exhaust Gas Recirculation Flow Insufficient Detected
The engine control module detected that exhaust gas recirculation (EGR) flow is insufficient, meaning the EGR valve isn't allowing enough exhaust gases to recirculate back into the combustion chamber. This disrupts the emissions control system and can cause engine knock and increased emissions.
What You Might Notice
- Engine pinging or knocking under load or at higher speeds
- Check engine light illuminated
- Rough idle
- Reduced fuel economy
- Increased exhaust emissions
Most Common Causes
- 1
EGR valve stuck closed
The EGR valve may be stuck in the closed position due to carbon buildup or mechanical failure, preventing exhaust gases from recirculating.
- 2
Carbon buildup in EGR tube
Excessive carbon deposits can block the EGR passage, restricting the flow of exhaust gases through the system.
- 3
Faulty DPFE sensor
The differential pressure feedback EGR sensor may be malfunctioning and sending incorrect flow signals to the engine control module.
- 4
Loss of vacuum to EGR valve
A vacuum leak or disconnected hose may prevent proper actuation of the EGR valve solenoid.
How to Diagnose It
- 1
Check EGR valve stuck closed — The EGR valve may be stuck in the closed position due to carbon buildup or mechanical failure, preventing exhaust gases from recirculating.
- 2
Check Carbon buildup in EGR tube — Excessive carbon deposits can block the EGR passage, restricting the flow of exhaust gases through the system.
- 3
Check Faulty DPFE sensor — The differential pressure feedback EGR sensor may be malfunctioning and sending incorrect flow signals to the engine control module.
- 4
Check Loss of vacuum to EGR valve — A vacuum leak or disconnected hose may prevent proper actuation of the EGR valve solenoid.
How to Fix It
- 1
Clean or replace EGR valve
Remove the EGR valve and inspect for carbon buildup. Clean the valve thoroughly or replace if damaged. Reinstall and test for proper operation.
- 2
Clean EGR passages and tubes
Remove EGR tubes and passages, then use appropriate cleaning methods to remove carbon deposits that may be blocking exhaust gas flow.
- 3
Replace DPFE sensor
Test the differential pressure feedback EGR sensor with a diagnostic tool. If faulty, disconnect and replace with a new sensor.
- 4
Check vacuum lines and connections
Inspect all vacuum hoses connected to the EGR system for cracks, loose connections, or disconnection. Repair or replace damaged hoses.
Need a deeper diagnosis?
Search for related repair guides or browse by system.