Boost Pressure Sensor Circuit Low
The boost pressure sensor signal is below expected values.
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What it means (plain English)
The engine's computer is seeing lower than normal readings from the boost pressure sensor, which measures the pressure of air entering the engine.
What the computer is actually seeing
The computer expects a signal voltage between 0.5V to 4.5V from the boost pressure sensor based on the intake pressure, and it is seeing values below 0.5V.
What a healthy reading looks like
Normal signal voltage from the boost pressure sensor ranges from 0.5V (at atmospheric pressure) to 4.5V (at maximum boost pressure).
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. Inspect the wiring and connectors of the boost pressure sensor for damage or corrosion. If any issues are found, repair them and retest the system.
- 22. Use a multimeter to check the voltage at the boost pressure sensor connector with the ignition on (engine off). You should see around 0.5V to 4.5V. If not within this range, replace the sensor.
- 33. With the engine running, recheck the boost pressure sensor voltage while monitoring for changes as the vehicle is revved up. If it remains low, consider a boost leak or further ECM diagnostics.
- 44. If all tests are within range and wiring is intact, suspect the ECM may be faulty and needs further testing.
Common causes
- Faulty boost pressure sensor
- Wiring issues in the sensor circuit
- Faulty engine control module (ECM)
- Boost leaks in the intake system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but may reduce engine performance and efficiency. Address it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code sometimes pair with others?
Multiple codes may indicate a common issue or fault in the boost pressure system.
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