What does P0237 mean?
The boost pressure sensor reads intake pressure after the turbocharger.
The computer is seeing a signal voltage that is lower than the sensor should ever produce, so it is almost always an electrical problem rather than a mechanical one.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Reduced power or limp mode
- Black smoke on diesels
Common causes
- Open in the 5 V reference wire
- Signal wire shorted to ground
- Unplugged or corroded connector
- Failed sensor
How to diagnose P0237
- With the key on, back-probe the connector: you should see about 5 V on the reference wire and a good ground (under 0.1 V drop).
- If reference and ground are good, check the signal wire for a short to ground with the connector unplugged.
- If the wiring checks out, the sensor itself is the likely fault.
- Key on, engine off, the reading should match barometric pressure.
- Check the port for oil and carbon.
How to fix it
- Clean the port
- Replace the sensor
- Repair wiring
Estimated repair cost
Likely repairs for P0237 run from about $100 to $350, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Boost/MAP sensor (diesel) | $100 - $350 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P0237?
Moderate severity
Drivable with care; power will likely be limited.
P0237 FAQ
What does P0237 mean?
P0237 stands for "Turbocharger/Supercharger Boost Sensor "A" Circuit Low". The boost pressure sensor reads intake pressure after the turbocharger.
Can I drive with a P0237 code?
Drivable with care; power will likely be limited.
How much does it cost to fix P0237?
It depends on the cause. The likely repairs for P0237 range from about $100 to $350 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P0237?
The most common causes are: open in the 5 V reference wire; signal wire shorted to ground; unplugged or corroded connector.