Boost Pressure Sensor Voltage Too High
The boost pressure sensor is sending a voltage reading that is higher than expected.
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What it means (plain English)
The boost pressure sensor measures the pressure of the air going into the engine. If it's reading too high, the engine computer thinks the turbo is pushing more air than it should, which can mess with performance and emissions.
What the computer is actually seeing
The engine control unit (ECU) expects a voltage from the boost pressure sensor between 0.5V (at low pressure, about 0 inHg) and 4.5V (at high boost pressure, around 30 psi). If the voltage is over 4.5V, it triggers this code.
What a healthy reading looks like
Expected voltage range: 0.5V to 4.5V; Pressure: 0 to 30 psi.
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 at the boost pressure sensor for wear or damage. Repair as needed. Decision: Is the wiring OK? (Yes/No)
- 22. Measure the voltage at the boost pressure sensor connector. Compare to expected values. Decision: Is the voltage over 4.5V? (Yes/No)
- 33. If voltage is over 4.5V, disconnect the sensor and check the voltage at the connector again. Decision: Is it still over 4.5V? (Yes/No)
- 44. If yes, diagnose possible shorting or ECU issue; if no, replace the boost pressure sensor.
Common causes
- Faulty boost pressure sensor
- Wiring issues (short to power)
- Faulty turbocharger or wastegate
- Poor electrical connections
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Not recommended. It can affect engine performance and emissions.
Will the 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 SPN 1031?
SPN 1031 is related to the turbocharger. If the boost sensor fails, it often coincides with turbo issues.
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