Powertrain
generic / SAE
P0238
Turbocharger/Supercharger Boost Sensor "A" Circuit High
The boost pressure A signal voltage is above the upper diagnostic threshold — short to supply voltage or defective sensor.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number2 / 38
Possible causes
- Sensor circuit shorted to supply voltage high
- Boost pressure sensor failed medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–400 €
- Estimated time: 0.3–2 h
- Component: boost pressure sensor
- Component: boost sensor wiring
- MIL / check engine light
- emissions-relevant
- limp mode possible
Sources
References
sae:J2012