Exhaust Pressure Sensor Circuit High Voltage
The exhaust pressure sensor is reporting a high voltage condition.
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What it means (plain English)
Inside the truck's engine control module, there's a sensor that measures exhaust pressure. If this sensor's signal voltage goes above 4.5 volts when it shouldn't, the module sees it as a problem.
What the computer is actually seeing
The engine control module (ECM) monitors the exhaust pressure sensor's signal voltage. A reading higher than 4.5 volts indicates a malfunction.
What a healthy reading looks like
The exhaust pressure sensor should typically output a signal between 0.5 volts (idle) and 4.5 volts (max pressure).
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 of the exhaust pressure sensor for damage or loose connections. Repair as necessary. Proceed to step 2.
- 22. Using a multimeter, check the output voltage of the exhaust pressure sensor with the engine running. Expected voltage is between 0.5 to 4.5 volts. If the voltage is above 4.5 volts, proceed to step 3. If normal, check for other codes or sensor issues.
- 33. Disconnect the sensor and check for a short to voltage. If the circuit shows continuity to power, repair the wiring. If no shorts, replace the exhaust pressure sensor.
Common causes
- Faulty exhaust pressure sensor
- Wiring issues (short to voltage or ground)
- Connector problems (corrosion, loose connections)
- Faulty ECM or harness issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe, but you may experience reduced engine performance or efficiency. Fix it soon.
Will this code come back after clearing?
It may return if the underlying issue isn't resolved, such as a bad sensor or wiring problem.
Why does this code often appear with SPN 2708?
Both codes relate to the exhaust pressure circuit, indicating a potential issue with the exhaust pressure sensor or wiring.
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