Boost Pressure Sensor Circuit High
The system has detected a high voltage on the boost pressure sensor circuit.
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What it means (plain English)
The boost pressure sensor is sending a signal to the engine control unit (ECU) that indicates the turbo's boost pressure is higher than expected, possibly due to a short circuit or a failed sensor.
What the computer is actually seeing
The ECU compares the voltage from the boost pressure sensor against expected values; a signal higher than 4.5 volts suggests a fault.
What a healthy reading looks like
The boost pressure sensor should typically output between 0.5 volts (no boost) and 4.5 volts (maximum boost).
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 connector to the boost pressure sensor for damage or corrosion. Fix or replace as necessary. Decision: If the wiring is intact, proceed to step 2.
- 22. Test the voltage at the boost pressure sensor connector with the ignition on (engine off). Expected voltage: 0.5-4.5 volts. Decision: If voltage is above 4.5 volts, replace the boost pressure sensor. If within range, proceed to step 3.
- 33. Check for short circuits: Disconnect the boost pressure sensor and measure the resistance between the sensor circuit and ground. Should be infinite (open). Decision: If resistance shows low or zero, repair the short. If open, suspect ECU issue. Proceed to step 4.
- 44. If all tests pass but the code persists, update or reflash the ECU software if applicable.
Common causes
- Damaged wiring or connector to the boost pressure sensor
- Faulty boost pressure sensor
- Short circuit in the sensor circuit
- ECU software issue
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
Yes, but performance may be affected. It's advisable to fix it soon to prevent potential damage to the engine.
Will this code come back after clearing?
It may return if the underlying issue isn't fixed—especially if the sensor or wiring is faulty.
Why does this code sometimes pair with low boost codes?
High voltage on the boost sensor can indicate a malfunction, often linked to low boost readings if the turbo isn't operating correctly.
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