P0236
Turbocharger/Supercharger Boost Sensor "A" Circuit Range/Performance
The boost pressure A signal stays within electrical limits but does not match expected values for the current operating point. Typical causes are leaking charge piping, a stuck wastegate, or sensor drift.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Common causes
Ordered by how often each turns out to be the cause.
- Charge air piping leakingCommon
- Wastegate stuck or seizedPossible
- Sensor driftLess likely
Parts involved
- Boost Pressure Sensor
- Charge Air Piping
- Wastegate
P0236 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.