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.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Boost pressure sensor
- Boost sensor wiring
- Turbocharger
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Boost pressure sensor failed
- Wiring or connector fault
Possible symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- Reduced-power or limp mode may occur
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.