Turbocharger Boost Pressure Sensor Circuit Fault
The turbocharger boost pressure sensor is reporting an out-of-range value.
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What it means (plain English)
The computer uses the turbo boost pressure sensor to monitor how much air is being compressed by the turbocharger. If this sensor sends a voltage that indicates too little or too much pressure, the engine control module (ECM) will throw an error.
What the computer is actually seeing
The ECM expects a boost pressure signal between 0.5V (at 0 inHg) and 4.5V (at maximum boost), indicating a range from atmospheric pressure to the max boost limit defined by the engine specs.
What a healthy reading looks like
Normal boost pressure sensor voltage should be 1.0V at idle (0 psi) and up to 4.0V at peak boost (exact values vary by engine).
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 at the boost pressure sensor for corrosion or loose connections. Decision Point: Is wiring intact? (Yes: Go to step 2; No: Repair or replace wiring/connector.)
- 22. Measure the voltage output of the boost pressure sensor with a multimeter while the engine is running. Expected: Voltage should vary smoothly from 1.0V to 4.0V. Decision Point: Are voltages within range? (Yes: Go to step 3; No: Replace the boost pressure sensor.)
- 33. Check for intake air leaks by inspecting piping and connections. Decision Point: Is there a boost leak? (Yes: Repair the leak; No: Go to step 4.)
- 44. Inspect the ECM for any software updates or stored faults related to boost control. Decision Point: Are updates available? (Yes: Update and retest; No: Check for further faults in the engine performance.)
Common causes
- Wiring issues with the boost pressure sensor
- Faulty boost pressure sensor
- Boost leaks in the intake system
- ECM software issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, it's drivable but performance may be reduced. Fix soon to prevent further issues.
Will this code come back after erasing it?
If the underlying issue isn't fixed, yes, it will likely return after clearing.
Why does this code pair with other SPN codes?
Codes often pair when multiple systems are affected, like boost control issues affecting fuel trim or EGR.
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