Fault code P0236 – a step-by-step guide to diagnosing and fixing it

Error code P0236 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the turbocharger boost sensor circuit. The DTC P0236 indicates that the control unit has registered a malfunction or a signal outside the expected range at the boost pressure sensor. This fault code mainly affects turbocharged vehicles and may have slightly different specifications for different manufacturers.

What causes can this error code have?

• Defective boost pressure sensor (MAP sensor)
• Damaged or corroded cable connections to the sensor
• Loose or dirty plug connections
• Defective vacuum hoses to the boost pressure sensor
• Faulty engine control unit software
• Mechanical problems on the turbocharger
• Clogged air filter or intake tract
• Defective fuse in the sensor circuit

What symptoms occur in parallel with fault code P0236?

• Loss of power: The engine shows significantly reduced power, especially when accelerating and under load.
• Irregular idling: The vehicle runs irregularly or stutters noticeably when idling.
• Increased fuel consumption: Consumption increases noticeably because the engine control system cannot work optimally.
• Black smoke: Dark smoke comes out of the exhaust, especially at full throttle.
• Starting problems: The vehicle is harder to start or requires several attempts.

How can the problem with error code P0236 be rectified?

• Repairing trouble code P0236 requires a systematic approach to identify the exact cause.
• Replace the boost pressure sensor: Replace the defective MAP sensor with a new original part and then reset the control unit.
• Repair wiring harness: Locate damaged cables to the boost pressure sensor, repair them professionally or replace the entire wiring harness.
• Clean plug connections: Thoroughly clean all plug connections on the boost pressure sensor, check for corrosion and treat with contact spray.
• Replace vacuum hoses: Identify defective or porous vacuum lines to the sensor and replace with new, heat-resistant hoses.
• Maintain air filter and intake tract: Replace clogged air filter and check the entire intake tract for leaks and dirt.
• Carry out control unit update: If there are known software problems, have the engine control unit software updated by a specialist workshop.