Engine-Codes - Generic - P0235

P0235 - Turbocharger/Supercharger Boost Sensor 'A' Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0235 Possible 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)

How is the P0235 code repair?

Start by checking 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's pins.

What is the cost to diagnose the P0235 code

Labor: 1.0

The cost to diagnose the P0235 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

This diagnostic trouble code (DTC) P0235 will set if the boost pressure sensor signal is above the predicted range.

Possible Symptoms

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

P0235 Meaning

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.

More Information

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