Straight Pipe Exhaust Pressure Sensor
Exhaust pressure sensor signal out of range.
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What it means (plain English)
The sensor that measures exhaust pressure is reading a value that it shouldn't be, which can happen if there's a blockage or the sensor is faulty.
What the computer is actually seeing
The ECM sees a voltage signal from the exhaust pressure sensor that is outside the expected range, typically lower than 0.2 volts or higher than 4.8 volts, indicating a potential issue with the sensor or exhaust flow.
What a healthy reading looks like
Expected voltage output from the sensor typically ranges from 0.5 to 4.5 volts under normal operating conditions.
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 sensor wiring and connectors for any damage or corrosion. Repair as needed.
- 22. Verify the exhaust pressure sensor's voltage output at key on engine off (KOEO); should be around 1.0 to 1.5 volts.
- 33. Start the engine and observe sensor voltage; it should increase as RPMs climb. If it stays below 0.2V or above 4.8V, replace the sensor.
- 44. Inspect the exhaust system for blockages, especially the DPF if equipped. Clean or replace as necessary.
- 55. If all looks good, test the ECM for faults past this sensor issue.
Common causes
- Faulty exhaust pressure sensor
- Wiring issue (short or open circuit)
- Exhaust blockage (like a clogged DPF)
- ECM malfunction
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but could lead to reduced performance and emissions failures, so fix it soon.
Will the code come back after clearing?
If the underlying issue isn't resolved, it will likely return.
Why does this code pair with codes for other sensors?
They often share the same wiring or might indicate a broader system issue affecting multiple components.
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