Exhaust Pressure Sensor Circuit Low Voltage
The exhaust pressure sensor is reporting a low voltage condition.
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What it means (plain English)
The exhaust pressure sensor measures the pressure in the exhaust system, and if the voltage it sends to the engine control module (ECM) is below 0.1 volts, it indicates a possible fault in the sensor or its wiring.
What the computer is actually seeing
The ECM is seeing a voltage reading from the exhaust pressure sensor below 0.1 volts when the expected range is around 0.5 to 4.5 volts under normal operating conditions.
What a healthy reading looks like
Normal operation shows the sensor output between 0.5 to 4.5 volts depending on exhaust pressure and engine load.
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.
- 1Check the exhaust pressure sensor wiring for damage or loose connections.
- 2Measure the voltage at the exhaust pressure sensor connector. It should be between 0.5 and 4.5 volts. If it's below 0.1 volts, suspect a short or faulty sensor.
- 3Inspect the ground connection for the exhaust pressure sensor; it should show less than 0.3 ohms to battery ground.
- 4If wiring and connections are good, replace the exhaust pressure sensor and retest.
Common causes
- Faulty exhaust pressure sensor
- Wiring issues or poor connections
- Short to ground in the sensor circuit
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but may affect performance and emissions; fix soon.
Will this code come back after clearing it?
If the issue isn't resolved, it will likely return once the vehicle is driving under load.
Why does this code pair with other exhaust codes?
Issues in the exhaust pressure sensor often affect overall exhaust system monitoring and function, leading to cascading faults.
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