EGR Flow Rate Insufficient
The exhaust gas recirculation (EGR) flow is lower than expected during operation.
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What it means (plain English)
The EGR system isn't recycling enough exhaust gases back into the engine, which can affect emissions and performance.
What the computer is actually seeing
The engine control module (ECM) detects that the EGR flow rate is below a certain threshold, often measured in grams per second (g/s) or percentage of expected flow during specific operations.
What a healthy reading looks like
EGR expected flow should be between 5-20 g/s depending on engine load; readings below 5 g/s may trigger the fault.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the EGR valve for proper operation. Manually actuate the valve and check for movement. If stuck, replace the valve.
- 22. Inspect EGR passages for blockages. Remove the EGR valve and check the intake manifold and exhaust side for carbon buildup.
- 33. Verify vacuum or pressure supply to the EGR valve. Check for leaks or damaged lines. Use a vacuum pump to ensure it's functioning.
- 44. Inspect wiring and connectors to the EGR valve for damage or corrosion. Repair as necessary.
- 55. Clear the code and run the vehicle. Monitor the EGR flow with a scan tool under various conditions. If the code returns, consider replacing the EGR valve.
Common causes
- Blocked EGR passages
- Faulty EGR valve
- Vacuum or pressure issues in the EGR system
- Wiring issues or poor connections
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s drivable but emissions will be affected. Fix soon to avoid more extensive damage.
Will this code come back after reset?
If the underlying issue isn’t fixed, yes.
Why does this code pair with other codes?
EGR-related codes often indicate multiple issues in the exhaust or emissions system.
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