Turbocharger Boost Sensor A Circuit Range/Performance Problem
The turbo boost sensor is reporting values outside of the expected range.
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What it means (plain English)
The sensor that measures the pressure created by the turbocharger is giving readings that are too high or too low, which means the engine management system can't properly control the boost pressure.
What the computer is actually seeing
The engine control unit (ECU) is seeing turbocharger boost pressure readings that are inconsistent with expected values based on engine load and RPM.
What a healthy reading looks like
Turbocharger boost pressure should be between 6 and 20 psi, depending on engine specifications and operating conditions.
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 turbocharger boost sensor wiring and connector for damage or corrosion. Are they in good condition?
- 22. Check for vacuum leaks in the intake system. Perform a smoke test if necessary. Are there any leaks?
- 33. Verify the boost pressure sensor reading using a scan tool while the engine is running. Is the reading within the expected range?
- 44. If readings are out of range, replace the boost sensor and retest. Do you still have the code?
- 55. If the code persists after sensor replacement, check the turbocharger for proper operation and check for intake restrictions.
Common causes
- Faulty turbocharger boost pressure sensor
- Wiring issues or damaged connectors to the boost sensor
- Vacuum leaks in the intake system
- Faulty turbocharger
- Clogged air filter or intake system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive it, but expect reduced performance and possibly worse fuel economy.
Will this code come back after repairs?
If repairs are done properly, such as fixing wiring or replacing a faulty sensor, it shouldn't return.
Why might this code pair with a P0299?
Both codes relate to turbo boost issues; P0299 indicates underboost which can be caused by the failing sensor in P0236.
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