Fault code P0075 – a step-by-step guide to diagnosing and fixing it

Error code P0075 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the Intake Valve Control Solenoid of bank 1. This DTC P0075 indicates that the variable valve control system is not functioning properly. With various manufacturers, this error code can also be referred to as "Variable Valve Timing Control Solenoid Malfunction".

What can cause this error code?

• Defective intake air control valve bank 1
• Blocked oil ducts in the VVT system
• Contaminated or low-quality engine oil
• Damaged wiring to the control valve
• Corroded or loose plug connections
• Defective engine control unit (ECM/PCM)
• Mechanical damage to the camshaft phaser
• Low oil pressure in the engine

What symptoms occur in parallel with fault code P0075?

• Loss of power: The engine noticeably loses power, especially at higher engine speeds. Uneven idling: The vehicle runs unevenly when stationary and vibrates more than usual. Increased fuel consumption: Fuel consumption increases significantly because the optimum valve timing is not working. Starting problems: The vehicle is more difficult to start, especially when the engine is cold. Knocking noises: Metallic noises from the engine compartment that indicate timing problems.

How to fix the problem of error code P0075?

• The repair requires a systematic approach to identify the exact cause.
• Change the engine oil and oil filter, as contaminated oil is often the cause of VVT problems
• Remove intake air control valve bank 1, clean or replace completely if defective
• Check the wiring and plug connections to the control valve for damage and repair them
• Have the oil ducts of the VVT system flushed with a special cleaner
• Check the engine control unit for software errors and reprogram if necessary
• Check the camshaft phaser for mechanical damage and replace if necessary
• Measure the engine oil pressure and check the oil pump if the pressure is low