Exhaust Gas Pressure (EGP) Sensor Circuit Low
EGP sensor is reading lower than expected pressure levels.
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What it means (plain English)
Inside the exhaust system, there's a sensor that checks how much pressure is in the exhaust gases. If it notices that the pressure is way too low, like under 1 psi when it should be at least 2-5 psi during normal operation, it triggers this code.
What the computer is actually seeing
The ECM monitors the EGP sensor voltage, expecting a range of 0.5V to 2.5V depending on specific RPM and load conditions. A reading below 0.5V indicates an issue.
What a healthy reading looks like
During normal operation, the EGP sensor should show values between 0.5V and 2.5V depending on engine load; below 0.5V is considered a fault.
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 EGP sensor wiring and connectors for any visible signs of damage or corrosion. Repair as needed. DECIDE: Does the wiring look good? If yes, proceed to step 2. If no, repair the wiring and retest.
Common causes
- Faulty EGP sensor
- Wiring issues (shorts or opens) in the EGP circuit
- Corroded or loose connector at the sensor
- Exhaust leaks affecting pressure readings
- Faulty ECM or software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the truck with this code?
Yes, but you may experience reduced performance and increased emissions.
Will this code clear on its own?
Not typically; it will reset after the cause is resolved and the fault is cleared.
Why might this code appear with low exhaust pressure?
It can be due to an actual issue with exhaust back pressure, like really poor exhaust flow from a clogged DPF or an EGP sensor that’s malfunctioning.
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