P0237

Symptoms

• Stored trouble code and an illuminated warning light
• mechanical noises from the turbocharger
• spark plug fouling in turbocharger failure cases
• hissing
• whistling
• or wheezing noises at higher engine speeds
• moderate to severe power reduction
• driveability problems including poor acceleration and stalling
• low boost pressure readings on gauges

Probable causes

• Malfunctioning boost pressure sensor
• damaged
• shorted
• burnt
• disconnected
• or corroded wiring and/or connectors
• leaks within the intake system allowing pressure loss
• restricted or dirty air filter elements
• failed turbocharger waste gate or control issues
• exhaust manifold leaks reducing turbo efficiency
• internal turbocharger component failure
• PCM failure (rare)

Diagnostic steps

1. Record fault codes and freeze frame data.
2. Verify reference voltage (should be approximately 5V) at the sensor.
3. Test ground and signal circuit resistance and continuity.
4. Measure sensor resistance directly.
5. Monitor live boost pressure data while raising engine speed.
6. Clear codes and run a complete drive cycle to confirm resolution.