Inlet Air Pressure Sensor
Pressure sensor in the intake manifold is out of range.
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What it means (plain English)
The inlet air pressure sensor tells the computer how much air is in the engine to calculate fuel mix. If it reads too high or too low, the engine may not run right.
What the computer is actually seeing
The engine control module (ECM) is monitoring the input from the inlet air pressure sensor. It expects a specific voltage representing atmospheric pressure to intake pressure but is receiving a value that's too high or too low.
What a healthy reading looks like
Normal voltage should be between 0.5V (low pressure) and 4.5V (high pressure) under typical conditions.
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 wiring and connectors to the inlet air pressure sensor for damage or corrosion.
- 22. Verify proper inlet air pressure with a scan tool or multi-meter; voltage should be between 0.5V and 4.5V.
- 33. If voltage is out of range, swap the inlet air pressure sensor with a known good unit.
- 44. If the new sensor reads fine, the original sensor was faulty. If not, check for vacuum leaks or consult the service manual for further troubleshooting.
Common causes
- Faulty inlet air pressure sensor
- Wiring issues or poor connections
- Vacuum leaks in the intake system
- Incorrect sensor installation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code on?
It is generally safe to drive, but fix it soon to avoid decreased performance or fuel economy.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code sometimes pair with other codes?
Other codes can indicate related issues in the air intake system, including sensor malfunctions or vacuum leaks.
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