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AutoCodes - Generic - P0238

P0238 Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit High

- Code Popularity: 106,116 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0238?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Boost Pressure Sensor
  • Boost Pressure Sensor harness is open or shorted
  • Boost Pressure Sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
  • Engine over temperature
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How to Fix the DTC P0238?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0238 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0238 Description

The Boost Pressure Sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with Accelerator Pedal Position (APP) and engine speed. The Engine Control Module (ECM) uses this information to assist in the diagnosis of the Barometric Pressure (BARO) sensor and to provide engine over-boost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The ECM supplies 5 volts to the boost pressure sensor on the 5-volt reference 2 circuit and provides a ground on a low reference circuit. The boost pressure sensor provides a signal to the ECM on a signal circuit relative to the pressure changes. The ECM monitors the boost pressure sensor signal for voltage outside of the normal range. The ECM calculates a predicted value for the boost pressure sensor. The ECM then compares the predicted value to the actual signal. This Diagnostic Trouble Code (DTC) P0238 will set if the boost pressure sensor signal is above the predicted range.
OBDII Code P0238 - Turbocharger/Supercharger Boost Sensor 'A' Circuit High - AutoCodes.com
P0238 Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit High

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Code P0238 comments

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