Common causes include: Signal shorted to ground; Failed boost pressure sensor; Reference-supply or connector fault.

P0237: Turbocharger/Supercharger Boost Sensor A Circuit Low

Q: What does code P0237 mean?

P0237 is the generic OBD-II code for 'Turbocharger/Supercharger Boost Sensor A Circuit Low'. The boost sensor A signal is below its permitted electrical range. Low describes the input circuit, not simply a turbo that is producing too little boost.

Severity: High Stop or minimize driving and get it looked at right away.

What does P0237 mean?

The boost sensor A signal is below its permitted electrical range. Low describes the input circuit, not simply a turbo that is producing too little boost.

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

Common causes

Signal shorted to ground
Failed boost pressure sensor
Reference-supply or connector fault

Symptoms

Low power
Reduced fuel economy
Check engine light or limp mode

Diagnostic focus

Do not substitute an underboost diagnosis for this electrical test. P0299 describes a boost-performance condition; P0237 can be set by wiring even before the engine makes boost.

Can I keep driving with P0237?

Severity: High Stop or minimize driving and get it looked at right away.

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

Typical fixes

Check sensor supply and ground
Inspect the signal wire for a ground short
Verify readings against the engine-specific sensor specification

Sources & review

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