P0236 Turbocharger/Supercharger Boost Sensor A Circuit Range/Performance

P0236 points to boost sensor A range/performance. The sensor signal is present but does not match expected pressure behavior.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not diagnose range/performance from one pressure value; compare sensor response across vacuum and boost conditions.

Symptoms of P0236

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0236

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Compare boost sensor A to MAP or BARO, desired boost, actual boost, throttle position, airflow, and engine load.
Inspect boost leaks, sensor port blockage, charge-pipe oil contamination, wiring resistance, connector fit, and sensor response time.
Check whether the fault appears under boost, at key-on, during deceleration, after intercooler service, or at high load.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.