Fault Code for EGR Position Sensor Circuit Low Voltage
Indicates low voltage in the EGR position sensor circuit.
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What it means (plain English)
The EGR position sensor tells the engine computer how far the EGR valve is open. If it sees lower than expected voltage, it thinks the EGR isn't working right.
What the computer is actually seeing
The engine control module (ECM) expects the EGR position sensor to send a voltage signal between 0.5 to 4.5 volts when the EGR is operating. A voltage below 0.5 volts is detected.
What a healthy reading looks like
EGR valve position sensor voltage should read between 0.5V and 4.5V at all times when the engine is running.
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 wiring and connectors to the EGR position sensor for damage or corrosion. Fix any issues found.
- 22. Use a multimeter to check the voltage at the EGR position sensor connector. Voltage should be between 0.5V and 4.5V.
- 3 - If voltage is low (<0.5V), check for shorts or open circuits in the wiring.
- 4 - If voltage is correct, replace the EGR position sensor and retest.
- 53. Clear the fault codes, then take the vehicle for a test drive to see if the code returns.
Common causes
- Wiring issue or short in the EGR position sensor circuit
- Faulty EGR position sensor
- Bad ECM software or programming issue
- Loose or corroded electrical connections
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's generally safe to drive, but performance may be affected. Fix this issue soon to ensure optimal engine operation.
Will the code come back after I clear it?
If the issue isn't fixed, the code will likely return, especially under load conditions.
Why does this code sometimes pair with SPN 3594?
SPN 3594 indicates issues with EGR flow. Low voltage in the position sensor can lead to incorrect readings of EGR flow.
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