EGR Valve Position - Abnormal Rate of Change
The EGR valve position is changing too quickly, causing performance issues.
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What it means (plain English)
The EGR (Exhaust Gas Recirculation) valve controls the flow of exhaust gases back into the intake to reduce emissions. If this valve is adjusting too rapidly, it can cause the engine to run unevenly or stall.
What the computer is actually seeing
The engine control module (ECM) monitors the position of the EGR valve. It expects a gradual change in position. If it detects changes greater than 15% in under 200 milliseconds, it triggers a fault code.
What a healthy reading looks like
EGR valve position should typically be around 25% to 75% during normal operation; rapid changes noted by the ECM at threshold values should not exceed the specified rates.
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 the EGR valve for physical damage or blockage.
- 22. Check the EGR valve connector and wiring for corrosion or damage.
- 33. Measure the EGR valve position with a scan tool while operating the engine; it should change smoothly and not rapidly exceed the expected rates.
- 44. If the EGR valve position is erratic, replace the EGR valve; if the wiring is damaged, repair it before replacing the valve.
- 55. If the problem persists after replacing the valve, check for carbon buildup in the EGR passages.
Common causes
- Faulty EGR valve
- Wiring issues or poor connections
- Carbon buildup in EGR passages
- Faulty ECM
- Vacuum leaks affecting EGR operation
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is advisable to fix it soon. You might experience reduced power and fuel efficiency.
Will this code come back after clearing it?
Yes, if the underlying issue is not resolved, the code is likely to return.
Why is this code paired with other codes?
EGR issues often cause a range of other faults due to their impact on engine performance and emissions.
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