EGR Control Circuit Fault
The Electronic Control Unit (ECU) detected an issue in the EGR control circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The ECU is not getting the right signals it needs to operate the Exhaust Gas Recirculation system, which helps reduce emissions. It could be due to wiring issues, or a faulty valve.
What the computer is actually seeing
The ECU sees a voltage reading above or below the expected range from the EGR control circuit, signaling a fault condition.
What a healthy reading looks like
EGR control circuit should show a voltage between 0.5V and 4.5V during 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 the wiring and connectors going to the EGR valve for any visible damage or corrosion.
- 22. Check the voltage at the EGR valve connector with the engine running; expect 0.5V to 4.5V.
- 33. If voltage is out of spec, repair the wiring or connectors before replacing the EGR valve.
- 44. If wiring and connectors check out, remove the EGR valve and test it; apply vacuum to the diaphragm and see if it opens cleanly without sticking.
- 55. If the EGR valve fails the test, replace it and clear codes.
- 66. If EGR valve is okay, check for ECU issues, which may require professional diagnostics.
Common causes
- Damaged wiring or connectors in the EGR circuit.
- Faulty EGR valve.
- Corroded electrical connectors.
- Failed ECU.
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends on the symptoms. Drivability can be affected. Fix it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will likely come back.
Why does this code show up with other EGR codes?
EGR systems are interconnected; a fault in one part can trigger related codes.
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