Error code

OBD2 P0237

OBD2P0237
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Turbo/Super Charger Boost Sensor 'A' Circuit Low.

Severity

highNot recommended to drive, especially in traffic, due to potential safety risks.

Summary

P0237 indicates that the turbocharger or supercharger boost sensor 'A' is reporting a low signal voltage to the PCM. This sensor is typically located on the inlet manifold.

Symptoms

  • Illuminated warning light
  • Stored trouble code
  • Poor acceleration and hesitation upon acceleration
  • Hissing, whistling, or wheezing noises at high engine speeds
  • Spark plug fouling in cases of turbocharger failure

Common Causes

  • Defective boost pressure sensor
  • Damaged wiring or connectors
  • Clogged air cleaner element
  • Leaks in the inlet tract
  • Exhaust manifold leaks reducing turbo drive pressure
  • Turbocharger mechanical failures

Diagnosis

  1. Check reference voltage at the sensor (should be around 5V)
  2. Inspect and test wiring for continuity and resistance issues
  3. Test boost pressure using a hand-held pump if available
  4. Inspect inlet tract for leaks or obstructions

Fixes

  • Replace defective boost pressure sensor— $200 (DIY, excluding labor)

FAQ

What should I do if the turbocharger is damaged?

Refer to a professional repair facility for proper inspection and replacement of the turbocharger.

How can I prevent misdiagnosis?

Ensure thorough inspection of the inlet tract, air cleaner element, and actual boost pressure before replacing parts.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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