What Does P0237 Mean?
The turbocharger boost pressure sensor A circuit is reporting a voltage below the minimum expected threshold. This indicates either the sensor signal is shorted to ground, the sensor has failed low, or there is a wiring fault pulling the signal low. The ECM cannot determine actual boost pressure, which is critical for safe turbo operation. The driver may notice reduced power or limp mode.
Common Causes
30%
Boost pressure sensor A failed with low or zero output voltage
25%
Short to ground in the boost sensor signal wire
20%
Corroded sensor connector with moisture-caused ground path
15%
Sensor ground wire shorted to the signal wire
10%
ECM internal pull-down fault on the sensor input
Diagnostic Steps
1
Check the boost sensor A PID — if it reads 0 psi or deep vacuum when the engine is off, the signal circuit is likely shorted to ground.
2
Unplug the boost pressure sensor and check if the PID jumps to maximum. If so, the wiring is intact and the sensor itself is faulty.
3
With the sensor unplugged, measure resistance between the signal pin at the ECM connector and chassis ground — it should be very high (>100 kΩ). Low resistance confirms a short to ground in the harness.
4
Inspect the sensor connector for corrosion, especially on vehicles where the sensor is exposed to road spray, heat, or moisture from the charge air system.
5
If the sensor and wiring test good, verify the 5V reference is present and the ground wire resistance is under 0.5 Ω — a missing reference can cause low signal output.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The turbocharger boost pressure sensor A circuit is reporting a voltage below the minimum expected threshold. This indicates either the sensor signal is shorted to ground, the sensor has failed low, or there is a wiring fault pulling the signal low. The ECM cannot determine actual boost pressure, wh...
The most common cause of P0237 (Turbocharger Boost Sensor A Circuit Range/Performance) is: Boost pressure sensor A failed with low or zero output voltage
Typical repair costs for P0237 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Drive gently and avoid boost. A low-reading boost sensor may cause the ECM to command higher boost than intended (thinking pressure is lower than it actually is), risking overboost. Most ECMs will enter a safe mode, but do not rely on this. Repair before any spirited or loaded driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0237 to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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