Engine Atmospheric Pressure Sensor
Indicates an issue with the atmospheric pressure sensor or its circuit.
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What it means (plain English)
The atmospheric pressure sensor measures the air pressure outside the engine. If it’s not working, the engine computer can’t calculate air/fuel mixture properly, which can cause performance issues.
What the computer is actually seeing
The ECM expects a signal voltage from the atmospheric pressure sensor that typically ranges from 0.5V to 4.5V, which correlates to pressures between 50kPa to 110kPa.
What a healthy reading looks like
Expected voltage is 1.0V at 100kPa; if the voltage is below 0.3V or above 4.7V, it indicates a fault with the sensor or its circuit.
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 atmospheric pressure sensor wiring for damage or corrosion.
- 2Inspect the connector for secure connection and signs of corrosion.
- 3Use a multimeter to check voltage at the atmospheric pressure sensor; it should be between 0.5V to 4.5V.
- 4If voltage is outside expected range, replace the atmospheric pressure sensor. If voltage is within range, check the ECM input/output for faults.
Common causes
- Faulty atmospheric pressure sensor
- Wiring issues (shorts or opens) in the sensor circuit
- Corroded or loose connectors
- Blocked sensor port or air passage
- Faulty ECM (in rare cases)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s best not to drive long distances as it may lead to poor engine performance.
Will the code return after clearing it?
If the issue isn't fixed, yes, the code will likely return.
Why is this code paired with boost pressure codes?
Atmospheric pressure influences boost pressure calculations, so faults in one can affect the other.
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