Engine EGR System Pressure Sensor
EGR system pressure sensor is reporting a fault.
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What it means (plain English)
The Engine Exhaust Gas Recirculation (EGR) system tries to reroute some exhaust back into the engine to reduce emissions. If the pressure sensor that measures this flow is faulty, it could mean either there's a blockage or the sensor itself is defective.
What the computer is actually seeing
The engine control module (ECM) expects the EGR pressure sensor to provide a voltage signal between 0.5V to 4.5V, which indicates various EGR flow conditions. If the voltage goes below 0.5V or above 4.5V for too long, the ECM triggers this code.
What a healthy reading looks like
EGR pressure sensor should output between 0.5V (no flow) and 4.5V (full flow) under normal 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. Inspect the wiring and connectors at the EGR pressure sensor for damage or corrosion. If found, repair or replace as needed. Decision point: If wiring is good, go to step 2.
- 22. Check the EGR pressure sensor output with a multimeter. Key on, engine off, you should see around 0.5V. If below this, replace the sensor. Decision point: If the voltage is correct, go to step 3.
- 33. Start the engine and run at idle, then check the sensor output again. The voltage should rise gradually. If it stays constant or drops, replace the sensor. Decision point: If it responds as expected, check EGR passages for blockage.
Common causes
- Faulty EGR pressure sensor
- Wiring issues or damaged connectors
- Blocked EGR passages or cooler
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the truck with this code?
Yes, but performance may be affected due to improper EGR operation. Fix soon.
Will this code come back after clearing it?
It may return if the underlying issue isn’t fixed, like a faulty sensor or blockage.
Why does this code come up with other codes?
EGR issues often have interconnected symptoms with other emissions-related components.
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