Combined Fault for EGR Position Sensor and EGR Valve Position Fault
There's a problem with the EGR valve's position or sensor performance.
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 computer checks the position of the EGR valve and its sensor. If it sees that they're not matching up (for example, the valve is supposed to be at 50% open, but the sensor reports 100% or 0%), it sets this code.
What the computer is actually seeing
The EGR position sensor should provide a voltage signal that reflects the actual position of the EGR valve. If the position sensor's output differs significantly from the expected range when the valve is commanded to open, the SPN 764 fault code is triggered.
What a healthy reading looks like
EGR valve position should be between 0.5V (fully closed) and 4.5V (fully open); any signal outside this range during operation can trigger the code.
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. Check the EGR valve wiring harness for damage or corrosion.
- 22. Inspect the EGR position sensor connector for loose connections.
- 33. With the engine running, use a scan tool to monitor the EGR valve position and compare it to the commanded position.
- 44. If they don't match (more than 10% difference), replace the EGR position sensor. If they do match, inspect the EGR valve function and actuator.
- 55. Clear the code and run the engine to see if the code returns.
Common causes
- Failed EGR valve
- Faulty EGR position sensor
- Wiring issues or poor connections in the EGR circuit
- Contamination or carbon buildup affecting EGR operation
- ECM software issue.
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
While it's driveable, fix it soon as it impacts emissions and performance.
Will the code come back after repairs?
If the underlying issue is fixed, the code shouldn't return.
Why does this code often pair with SPN 765?
SPN 765 indicates a specific issue with the EGR valve; both codes relate to EGR performance.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →