P0235: Turbocharger/Supercharger Boost Sensor A Circuit Malfunction

What does P0235 mean?

The boost pressure sensor A circuit is not providing the expected information. The computer uses this signal to supervise boost control, but a circuit fault alone does not prove the turbocharger has failed.

Generic OBD-II definition: Turbocharger/Supercharger Boost Sensor A Circuit Malfunction. Confirm applicability in your vehicle service information.

Common causes

• Boost-sensor wiring or connector fault
• Failed pressure sensor
• Missing reference supply or sensor ground

Symptoms

• Weak acceleration
• Boost-related limp mode
• Check engine light

Diagnostic focus

Start with the circuit named by the code. Turbo replacement is not justified until electrical feedback, intake connections, and engine-specific boost tests have been checked.

Can I keep driving with P0235?

Severity: Medium Drive gently and get it diagnosed soon.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Inspect boost sensor A and its pressure connection
• Check reference, ground, and signal circuits
• Compare pressure data before testing the turbo mechanism

Sources & review

• OBD-Codes.com: P0235
• TroubleCodes.net: generic code definitions

Definitions and diagnostic background checked 2026-11-06. Generic guidance, not a substitute for the service procedure for your exact year, engine, and transmission.