Air Supply Pressure Sensor - Malfunction
The air supply pressure sensor is reporting a malfunction.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
Your truck has a sensor that checks the air pressure in the intake system. If this sensor fails, it can cause the engine to run poorly or reduce its power.
What the computer is actually seeing
The engine control module (ECM) sees a voltage out of range from the air supply pressure sensor. Typically, it expects a signal from 0.5V to 4.5V depending on the actual pressure. If it reads 0V or above 4.5V, it throws this code.
What a healthy reading looks like
Expected voltage range from the air supply pressure sensor should be between 0.5V and 4.5V under normal operating conditions. At sea level, pressure should read approximately 2.5V.
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.
- 1Inspect the wiring and connectors to the air supply pressure sensor for damage, corrosion, or loose connections. Repair or replace as necessary.
- 2Check the sensor's voltage with a multimeter: should be between 0.5V and 4.5V. If not, proceed to the next step.
- 3If the wiring and connections are good, replace the air supply pressure sensor and retest.
- 4If the problem persists after replacing the sensor, inspect the intake system for leaks, checking all hoses and connections.
Common causes
- Faulty air supply pressure sensor
- Wiring issue (short or open circuit)
- Bad connections at the sensor or ECM
- Intake air leaks
- Contaminated sensor with oil or debris
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable, but expect reduced engine performance and possible emissions issues. Fix soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code pair with other codes?
Often, multiple sensors can be affected by the same issue, such as wiring faults or air leaks.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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