Turbocharger/Supercharger Boost Sensor A Circuit Low
What it means
P0237 means the turbo/supercharger boost-pressure sensor A is reporting a voltage below its normal range — usually a short to ground, an open, or a failed sensor. With no trustworthy boost reading, the ECM typically limits boost and cuts power to protect the engine.
Can I keep driving? Usually driveable, but expect reduced power as the ECM limits boost until the sensor circuit is fixed.
Real-world scan data
Appears alongside · share of P0237 scans
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Noticeable loss of power or reduced boost
- Hesitation or surging under acceleration
- Reduced fuel efficiency
Common causes
Most likely first
- Short to ground or open in the boost-sensor signal wiringLikely
- Failed boost-pressure sensorCommon
- Corroded or loose sensor connectorCommon
- Rarely, a failed ECMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame and inspect the boost-sensor connector and wiring for a short to ground or an open.
- Check the sensor's 5V reference and ground, then compare the signal voltage to spec at key-on and under boost.
- Replace the boost-pressure sensor if reference and ground are good but the signal stays low.
- Repair any damaged wiring, then clear and road-test.
FAQ
Quick answers
Is it safe to drive with P0237?+
Can I just clear P0237?+
Related codes
Read & clear P0237 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.