P0238: Turbocharger/Supercharger Boost Sensor A Circuit High
What to do
Expect a limp mode. Have it diagnosed before extended driving.
What this code means
The primary boost sensor signal is above its valid range — a short to supply, or an open ground. A sensor reporting implausibly high boost will cause the module to cut power protectively, so the symptom is usually an abrupt limp rather than a gradual decline.
Likely causes
Start here
- Wiring shorted to voltage · moderate
- Open sensor ground circuit · moderate
- Faulty boost pressure sensor · moderate
Less common
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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