Exhaust Pressure Sensor Input Problem
The exhaust pressure sensor is reporting an incorrect voltage reading.
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What it means (plain English)
Inside the exhaust system, there's a sensor that measures pressure. It sends a signal to the engine control module (ECM). If it sees 0 volts or an unusually high voltage (like 5 volts when it should be 0-1 volt), it thinks something's off and triggers the code.
What the computer is actually seeing
The ECM is monitoring the voltage output from the exhaust pressure sensor. Normal readings should be between 0-1 volt under idle conditions; if it sees 0 volts or anything above 1 volt when it shouldn't, it triggers the fault code.
What a healthy reading looks like
Exhaust pressure sensor should show 0-1 volt at idle and increase with engine load without dropping to 0 or exceeding 1 volt significantly.
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 connector; ensure it's secure and free of corrosion. Decision: If it's damaged, repair/replace the connector. If okay, move to step 2.
- 22. Inspect the wiring from the sensor to the ECM for shorts or opens. Use a multimeter to check continuity. Decision: Fix any wiring issues found. If wiring is intact, proceed to step 3.
- 33. Test the exhaust pressure sensor output using a scan tool or multimeter. At idle, voltage should be between 0-1 volt. Decision: If readings are out of this range, replace the sensor. If readings are okay, further investigate the exhaust system.
Common causes
- Faulty exhaust pressure sensor
- Wiring issue (short to ground or open circuit)
- Dirty or clogged exhaust system
- Connector problems (corrosion or loose connection)
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable but may affect performance or emissions; fix soon.
Will the code come back after clearing?
If the issue isn't resolved, the code will likely return after clearing.
Why does this code pair with others?
These codes are related to exhaust system performance, and issues can affect multiple sensors.
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