EGR Valve Position Sensor - Mismatch
The EGR valve position sensor data does not match expected readings.
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What it means (plain English)
The computer is getting readings from the EGR valve position sensor that are out of the normal range, meaning either the sensor or the EGR system might be malfunctioning.
What the computer is actually seeing
The Engine Control Module (ECM) sees a voltage signal from the EGR position sensor outside of the expected range, typically between 0.5V and 4.5V, indicating a problem with position feedback.
What a healthy reading looks like
EGR position sensor expected voltage: 0.5V to 4.5V with EGR fully closed to fully opened respectively; should change smoothly under 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. Check the EGR position sensor wiring and connectors for any signs of corrosion or damage. If you find any, repair or replace as necessary. - Decision: Good wiring? Proceed to step 2, else fix wiring issues.
- 22. Measure the voltage at the EGR position sensor with a multimeter. It should be within the range of 0.5V to 4.5V. - Decision: Voltage within range? Proceed to step 3, else replace the sensor if it's out of range.
- 33. Inspect the EGR valve for proper function. Manually actuate it if possible to ensure it moves freely. - Decision: EGR valve functions correctly? If not, replace the EGR valve.
Common causes
- Faulty EGR position sensor
- Wiring issues or damaged connectors
- EGR valve sticking or leaking
- Software glitches in the ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's advisable to fix it soon as it may impact emissions and performance.
Will this code come back after clearing?
If the underlying issue is not fixed, yes, this code is likely to return.
What happens if the EGR fails completely?
Complete failure can lead to increased emissions and potential engine damage.
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