Exhaust Gas Recirculation (EGR) Flow Rate Too Low
The EGR flow rate is lower than expected during operation.
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What it means (plain English)
The engine’s computer expects a certain amount of exhaust gases to be recirculated back into the engine for better efficiency, but it’s not getting enough, which can cause increased emissions and poor performance.
What the computer is actually seeing
The EGR system is designed to reduce nitrogen oxides (NOx) by recirculating exhaust gases back into the intake. The computer sees low flow values when it measures the position of the EGR valve compared to calculated or desired values.
What a healthy reading looks like
EGR flow percentage should be between 20% and 60% during active regeneration. Actual EGR flow should be monitored in grams per second and should not drop below 5 grams/sec under normal operation.
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. Inspect EGR valve and ensure it is not blocked or stuck. If blocked, clean or replace valve.
- 22. Check vacuum lines connected to the EGR system for leaks or damage. Replace as necessary.
- 33. Test the EGR position sensor: Should show a consistent voltage signal proportional to EGR valve position. Replace if readings are out of spec.
- 44. Make sure the exhaust system is clear and free of restrictions. Check for excessive soot build-up.
- 55. Clear codes and perform a drive cycle to see if code returns.
Common causes
- EGR valve stuck closed or partially clogged
- Vacuum lines damaged or leaking
- Exhaust restrictions due to soot or blockage
- Faulty EGR position sensor
- Wiring issues or connector corrosion
Typical repair cost
$$ (200 - 800)
Related codes
Frequently asked questions
Is it safe to drive with this fault code?
It is drivable, but expect reduced efficiency and increased emissions. Keep an eye on performance.
Will this code come back after clearing?
If the underlying issue isn’t fixed, it likely will return after some driving.
Why does this code sometimes appear with other codes?
EGR-related issues can affect other sensors and systems, leading to multiple codes recorded.
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