Turbocharger/Supercharger Boost Sensor A Circuit Range/Performance
Boost sensor A failed a range or plausibility check on a turbocharged or supercharged application. Some systems compare boost, manifold and barometric readings even before starting. P0236 does not automatically mean actual overboost or underboost. A biased sensor, circuit problem or pressure-path issue must be distinguished using the specific boost-system layout and manufacturer test procedure.
Can I keep driving?
Smoke, unusual turbo noise, unsafe power loss, overheating or an oil warning calls for a safe stop and towing. With a steady light and no symptoms, get shop advice before further driving and avoid heavy load, towing and hard acceleration.
What does this code mean for your car?
The same code can need different checks depending on the model and engine. Enter your vehicle details to find relevant sources and checks.
Symptoms
- Engine warning or reduced power
- Hesitation during acceleration
- There may be no additional symptom
Possible causes
- 1Biased boost sensor A
- 2Wiring, connector or reference-voltage fault
- 3Blocked sensing port or damaged pressure hose depending on design
- 4Inaccurate comparison pressure sensor
These possibilities are not ranked by frequency and do not diagnose your vehicle.
Checks you can safely do yourself
Safe checks only: engine off and cold, car on level ground.
- Save the code and freeze-frame data if your scanner offers them, without clearing anything.
- Note whether the code appeared just after starting or intake work; do not unplug a sensor or pressure-clean a sensing port.
When you need a shop
Request engine-off pressure comparison using the manufacturer procedure, sensor A circuit tests and verification against ambient conditions. Then assess boost control and air paths as the findings indicate.
How much does it cost?
A US repair estimate needs a diagnosis and a local shop quote.
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.
Get 2-3 quotes
Investigate this code for my carFAQ
Can I keep driving with P0236?
Smoke, unusual turbo noise, unsafe power loss, overheating or an oil warning calls for a safe stop and towing. With a steady light and no symptoms, get shop advice before further driving and avoid heavy load, towing and hard acceleration.
What can cause P0236?
Possible causes include biased boost sensor A; wiring, connector or reference-voltage fault; blocked sensing port or damaged pressure hose depending on design; inaccurate comparison pressure sensor. These are diagnostic possibilities, not a confirmed diagnosis or a parts shopping list.
Does clearing the code fix the problem?
No. Clearing a code does not repair the problem or prove that no fault exists. It may erase useful evidence and reset readiness monitors. Save codes and freeze-frame data first; confirming a repair requires the vehicle-specific checks.
What if this code appears during a used-car inspection?
Arrange an independent professional pre-purchase inspection before committing. Request a complete scan, readiness status and diagnosis of the relevant system. Get written findings and a repair estimate; an unlit warning lamp does not replace inspection.
How much does a P0236 repair cost?
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.