Exhaust Gas Recirculation (EGR) Control Circuit Low
The EGR control circuit is detecting low voltage.
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What it means (plain English)
Inside the engine control module, there's a monitor for how well the EGR (Exhaust Gas Recirculation) system is working. Low voltage means the computer isn't getting the signal it needs to know that the EGR is working correctly, which can lead to more exhaust fumes inside the engine.
What the computer is actually seeing
The engine control module sees that the EGR control circuit is sending less than the expected voltage, often less than 0.5 volts when it should be around 1-5 volts during operation.
What a healthy reading looks like
EGR control voltage should be between 1V to 5V; below 0.5V indicates a problem.
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 connections for dirt, corrosion, or damage. If any issues, clean or repair and retest.
- 22. Measure the voltage at the EGR valve connector with the key on and engine off. It should read between 1V and 5V. If voltage is below 0.5V, continue to the next step.
- 33. Check the wiring between the ECM and the EGR valve for damage or grounding issues. Repair as necessary and retest voltage.
- 44. If the voltage is still below 0.5V with no wiring issues, swap out the EGR valve with a known good unit and retest.
- 55. If the problem persists after replacing the EGR valve, inspect the ECM for faults or codes, and consider reprogramming or replacing it.
Common causes
- Faulty EGR valve
- Damaged wiring or connectors in EGR circuit
- Short to ground in EGR circuit
- Malfunctioning engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's moderate severity — drivability may be affected, so have it checked soon.
Will the code come back after repairs?
If all connections are good and the right parts are replaced, it should stay cleared.
Why does this code appear with other codes?
EGR issues often cause multi-codes due to interrelated functions like flow and performance.
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