Exhaust Pressure Sensor Circuit Low
The exhaust pressure sensor is not providing a proper voltage signal.
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What it means (plain English)
The exhaust pressure sensor measures the pressure in the exhaust system. If this sensor sends a signal that’s too low (below 0.1 volts), it indicates a problem in the exhaust system or the sensor itself.
What the computer is actually seeing
The engine control module (ECM) expects a voltage range from the exhaust pressure sensor typically between 0.5V to 2.0V under normal operating conditions. If it sees a voltage dip below 0.1V, it triggers the fault code.
What a healthy reading looks like
Normal operating voltage from the exhaust pressure sensor should be around 0.5V to 2.0V, correlating to exhaust pressure between roughly 30 to 120 kPa.
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 to the exhaust pressure sensor. Look for fraying, corrosion, or disconnected wires. Decision: If wiring is damaged, repair or replace it.
- 22. Measure the voltage at the exhaust pressure sensor connector with the engine running. It should read between 0.5V to 2.0V. Decision: If voltage is below 0.1V, go to Step 3. If voltage is normal, replace the sensor.
- 33. Check for any exhaust restrictions (blocked DPF, catalytic converter). Use a pressure gauge to ensure exhaust pressure is within specs. Decision: If there's a restriction, address it. If not, replace the exhaust pressure sensor.
Common causes
- Faulty exhaust pressure sensor
- Wiring issues or damaged connectors
- Blocked or restricted exhaust system
- Corrosion or debris in the sensor connector
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive for long periods as it may cause further damage to emissions components if there's a restriction.
Will this code come back after I fix it?
If you properly address the faulty component and wiring, and there are no additional issues, the code should not return.
Why does this code often pair with others?
Multiple exhaust issues can occur due to a shared system, so similar codes may trigger if one component fails.
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