Fault code P0248 – a step-by-step guide to diagnosing and fixing it

Error code P0248 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the turbocharger wastegate solenoid A. This DTC P0248 indicates problems with the electronic boost pressure control, which is responsible for optimum performance in turbocharged engines. Depending on the manufacturer, related components of the turbocharger system may also be affected.

What causes can this error code have?

• Defective turbocharger wastegate solenoid
• Damaged vacuum lines to the wastegate
• Electrical defect in the solenoid circuit
• Corroded or loose plug connections
• Defective wastegate diaphragm
• Blocked vacuum lines
• Faulty engine control unit (ECU)
• Mechanical blockage of the wastegate valve

What symptoms occur in parallel with fault code P0248?

• Loss of power: The engine develops significantly less power, especially at higher engine speeds.
• Irregular boost pressure: Fluctuating engine performance and jerky running under load.
• Black smoke: Increased soot formation in the exhaust gas due to unoptimized combustion.
• Whistling or hissing: Unusual noises from the engine compartment due to loss of pressure.
• Increased fuel consumption: The engine requires more fuel for the same performance.

How can the problem of error code P0248 be rectified?

• The repair requires a systematic diagnosis of the turbocharger components in order to identify the exact cause.
• Replace the wastegate solenoid: Replace the defective solenoid valve with a new original part and check electrical connections
• Replace vacuum lines: Check all hoses to the wastegate for cracks, blockages or ageing and replace completely if necessary
• Repair electrical connections: Clean plug connections, repair broken cables and check ground connections
• Replace wastegate diaphragm: In the event of mechanical defects, have the complete wastegate unit replaced
• Carry out turbocharger service: Professional cleaning and calibration of the entire turbocharger system
• Update the engine control unit: Carry out a software update or reset the ECU according to the manufacturer's specifications