Fault code P0237 – a step-by-step guide to diagnosing and fixing it

Error code P0237 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the boost pressure sensor circuit, which is reporting a signal that is too low. This DTC P0237 mainly affects the turbocharger boost pressure sensor and the associated engine management components. For various manufacturers, this fault code may also be referred to as "Turbocharger Boost Sensor A Circuit Low".

What causes can this error code have?

• Defective boost pressure sensor (MAP sensor)
• Damaged or corroded cables to the boost pressure sensor
• Loose or defective plug connections on the sensor
• Short circuit in the sensor wiring
• Defective vacuum hoses to the boost pressure sensor
• Faulty engine control unit (ECU)
• Leaks in the intake system
• Defective turbocharger or intercooler
• Clogged air filter

What symptoms occur in parallel with fault code P0237?

• Loss of power: The engine shows significantly reduced power, especially under load
• Poor acceleration: The vehicle accelerates sluggishly and reacts delayed to accelerator pedal operation
• Uneven idling: The engine runs unevenly at idle or stutters
• Increased fuel consumption: Significantly higher consumption than usual
• Black smoke: Black or blue smoke comes out of the exhaust
• Starting problems: The vehicle is difficult to start or stalls after starting

How can I fix the problem with error code P0237?

• Repairing trouble code P0237 requires a systematic diagnosis of the boost pressure components.
• Replace the boost pressure sensor completely and clean the plug connection, as this is the most common cause of the EOBD error code
• Check all cable connections to the sensor, repair or replace damaged cables and treat contacts with contact spray
• Check vacuum hoses to the boost pressure sensor for cracks or leaks and completely replace defective hoses
• Check the entire intake system for leaks, tighten all hose clamps and seal any leaks
• Replace the air filter and remove dirt from the entire intake system
• Test the function of the turbocharger and intercooler and have them professionally repaired or replaced if defective
• Test the engine control unit with professional diagnostic software and have it reprogrammed or replaced if necessary