Exhaust Gas Recirculation (EGR) Flow - Incorrect Detected
The EGR flow is not what the engine control module (ECM) expects.
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What it means (plain English)
The system is checking how much exhaust gas is being recirculated back into the engine and it’s not seeing the flow it should. This can happen if the EGR valve is stuck or blocked, or if there are leaks in the system.
What the computer is actually seeing
The ECM monitors EGR flow using a differential pressure sensor. It expects a certain pressure drop across the EGR valve when it's open. If the pressure drop is below expected levels (less than 0.5 inHg), it sets this code.
What a healthy reading looks like
Expect a pressure drop across the EGR valve of at least 0.5 inHg when the system is functioning properly. EGR flow should be noticeable at higher engine loads, usually around 50% throttle or more.
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.
- 1Check for any intake or exhaust leaks, including around the EGR valve and the exhaust manifold.
- 2Inspect EGR valve for clogs or sticking. Manually test operation if necessary.
- 3Measure the voltage and resistance at the EGR pressure sensor; should output 1-5 volts based on position.
- 4Check the wiring and connectors related to the EGR system for corrosion or damage.
- 5Test the EGR valve operation with a scanner; it should actuate at specified throttle positions.
Common causes
- Clogged EGR valve
- Faulty EGR pressure sensor
- Vacuum leaks in EGR system
- Faulty wiring or connectors to the EGR
- Engine operating conditions not suitable for EGR
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Drivability may be affected; performance can be reduced, and emissions might increase. Fix soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, it's likely to return after a drive cycle.
Why do I see this code with low power?
Low power can result from improper EGR flow, affecting combustion efficiency.
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