FMI 3 - EGR Valve Position Sensor Circuit Voltage Below Normal
The EGR valve position sensor is reporting a low voltage condition.
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 sensor that tells the computer how open or closed the Exhaust Gas Recirculation (EGR) valve is is showing less voltage than it should, indicating a problem with the sensor or circuit.
What the computer is actually seeing
The engine control unit (ECU) expects to see a voltage from the EGR valve position sensor typically between 0.5V to 4.5V depending on the position of the valve. If the voltage drops below 0.2V, it triggers this code.
What a healthy reading looks like
Expected voltage from EGR position sensor: 0.5V (closed) to 4.5V (fully open).
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 wiring and connectors for any damage or corrosion. Is anything visibly damaged? YES - Repair wiring/connectors and retest. NO - Proceed to step 2.
- 22. Use a multimeter to measure the voltage at the EGR position sensor connector with the key on (engine off). Is the voltage below 0.2V? YES - Check for continuity in the wiring harness and repair any issues found. NO - Replace the EGR position sensor and retest.
Common causes
- Bad EGR position sensor
- Wiring or connector issues
- Faulty EGR valve
- Electrical short or open circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but you may experience reduced power and efficiency, fix it soon.
Will this come back after clearing?
If the underlying issue isn't fixed, yes, the code is likely to return.
Why does this code show up with other SPNs?
EGR-related faults often cause multiple codes due to interconnected systems.
Working a real vehicle right now?
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