Engine Exhaust Pressure Sensor Low Voltage
The engine exhaust pressure sensor is reporting a low voltage condition.
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What it means (plain English)
Inside the exhaust system, there's a sensor that measures exhaust pressure. If it detects a voltage drop below what it should be, it triggers this code. You might see values as low as 0 volts when it should be around 0.5 to 4.5 volts during normal operation.
What the computer is actually seeing
The engine control module (ECM) sees a voltage reading from the exhaust pressure sensor that is below the standard threshold, usually under 0.5 volts. This indicates a possible failure in the sensor or its wiring.
What a healthy reading looks like
Normal voltage from exhaust pressure sensor should be between 0.5 and 4.5 volts, depending on the exhaust pressure being measured.
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.
- 1Verify the fault using a scanner; ensure SPN 614 is present.
- 2Inspect the wiring and connectors for damage or corrosion at the exhaust pressure sensor—fix any issues found.
- 3Check the exhaust system for blockages or restrictions—ensure it is clear and not obstructed.
- 4Use a voltmeter to measure the voltage at the exhaust pressure sensor connector. Expected value is 0.5 to 4.5 volts. If voltage is outside this range, replace the sensor.
- 5If all is well with the wiring and sensor, consider checking the ECM for faults.
Common causes
- Faulty exhaust pressure sensor
- Damaged wiring or connectors to the sensor
- Blocked exhaust system
- Failed ECM affecting sensor readings
Typical repair cost
$$ (100 - 400 dollars)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's typically safe to drive, but you may experience reduced performance or increased emissions. Get it checked soon.
Will the code come back after clearing it?
If the underlying issue is not fixed, the code will likely return after a short drive cycle.
Why does this code pair with blocked exhaust codes?
A blocked exhaust can cause incorrect pressure readings from the sensor, triggering this code.
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