Engine-Codes - Mercedes-Benz - P0237 Mercedes-Benz

P0237 Mercedes-Benz Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit Low

- Code Popularity: 26,604 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0237 Mercedes-Benz?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Boost pressure sensor harness is open or shorted
  • Boost pressure sensor circuit poor electrical connection
  • Faulty boost pressure sensor
  • Faulty Turbo/Super Charger
  • Engine over temperature
  • Ignition misfire exceeds the calibrated threshold
  • Faulty Knock sensor (KS)
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How to Fix the DTC P0237 Mercedes-Benz?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0237 Mercedes-Benz code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

This diagnostic trouble code (DTC) P0237 will set if the boost pressure sensor signal is below the predicted range.

What are Code Possible Symptoms?

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

What Does the P0237 Mercedes-Benz Code Mean?

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 diagnosis of the barometric pressure (BARO) sensor and to provide engine overboost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The Engine Control Module (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.
P0237 Mercedes-Benz Code - Turbocharger/Supercharger Boost Sensor 'A' Circuit Low

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