Exhaust Pressure Sensor Circuit Low Value
The exhaust pressure sensor signal is too low for acceptable operation.
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What it means (plain English)
The exhaust pressure sensor measures the pressure in the exhaust system. If it shows a value that's lower than expected, the engine control module thinks there's a problem with sensing exhaust flow or a blockage in the system.
What the computer is actually seeing
The engine control module expects an exhaust pressure signal between 0.5 to 2.0 volts at idle. A reading below 0.5 volts indicates a fault. This reading is taken every 100 milliseconds for real-time monitoring.
What a healthy reading looks like
Expected exhaust pressure should be between 1.2 to 1.8 bar (around 17.4 to 26 psi) during normal operation, especially at higher RPMs.
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. Check the exhaust pressure sensor wiring for any visible damage or corrosion.
- 22. Measure the voltage at the sensor connector with the ignition on (engine off); expect 5 volts on the reference pin.
- 33. With the engine running, backprobe the signal pin; should show between 0.5 - 2.0 volts.
- 44. If voltage is below 0.5 volts, check for shorts to ground in the wiring. Repair any issues found.
- 55. If wiring checks out, replace the exhaust pressure sensor and retest.
Common causes
- Wiring issues such as shorts or opens in the signal circuit
- Faulty exhaust pressure sensor
- Exhaust blockage or restrictions
- Poor connection at the sensor or ECM plug
- Corroded or damaged connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this fault?
Yes, but expect reduced performance; drive cautiously and fix soon.
Will the code come back after clearing it?
If it returns, the issue has not been resolved, such as wiring or sensor problems.
Why am I getting this code but also having issues with my turbo?
Exhaust pressure affects turbo performance; if the sensor reads low, it can signal other exhaust-related issues as well.
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