MCM - EGR Position Sensor 1 - Voltage Above Normal
EGR position sensor voltage is too high for normal operation.
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What it means (plain English)
The engine control module (ECM) is seeing a higher than expected voltage from the EGR position sensor, which can cause issues with exhaust gas recirculation control.
What the computer is actually seeing
The ECM receives a voltage reading from the EGR position sensor that exceeds the specified range, typically greater than 4.5 volts when it should be between 0.5 to 4.0 volts.
What a healthy reading looks like
EGR position voltage should typically be between 0.5V (closed) and 4.0V (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 EGR position sensor wiring and connectors for damage or corrosion. Repair as necessary. Decision: If wiring/connector is damaged, fix it and retest. If OK, proceed.
- 22. With the key on (engine off), use a multimeter to check the voltage at the EGR position sensor. Expected: 0.5V to 4.0V. Decision: If the voltage is out of range, sensor may be faulty.
- 33. Disconnect the EGR position sensor and check for any shorts to power in the wiring harness. Decision: If a short is found, repair and retest. If not, replace the EGR position sensor and retest.
- 44. If the EGR sensor is new and wiring is intact, check the ECM for any fault messages and measure its power output to the sensor. Decision: If ECM is faulty, it may need to be replaced.
Common causes
- Faulty EGR position sensor
- Wiring issues between the sensor and ECM
- Short to power in the EGR sensor signal line
- Defective ECM
- EGR valve sticking open
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 5473 active?
It's best to address this code soon, as it can affect engine efficiency and emissions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code is likely to return.
Why does this code pair with other SPN codes?
EGR system issues often affect multiple components, leading to related fault codes.
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