OBD-II code · Powertrain (generic)
P0235 Turbocharger/Supercharger Boost Sensor "A" Circuit
The ECU detected an electrical fault in the primary (A) boost pressure sensor circuit. The signal does not match plausibility checks against MAP, RPM, and load. With no boost feedback, the ECU typically limits boost via the wastegate.
Is it safe to drive with P0235?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBoost pressure sensor failed
- PossibleWiring or connector fault
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Likely to fail
- Parts involved
- Boost Pressure Sensor, Boost Sensor Wiring, Turbocharger
Related codes
- P0232Fuel Pump Secondary Circuit High
- P0233Fuel Pump Secondary Circuit Intermittent
- P0234Turbocharger/Supercharger "A" Overboost Condition
- P0236Turbocharger/Supercharger Boost Sensor "A" Circuit Range/Performance
- P0237Turbocharger/Supercharger Boost Sensor "A" Circuit Low
- P0238Turbocharger/Supercharger Boost Sensor "A" Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.