1. Faulty Accelerator Pedal Position Sensor (~60–70% of Cases)
Issues such as a malfunctioning boost control solenoid valve, damaged vacuum lines, or a failing turbo wastegate actuator (often paired with code DTC 226321) will force the vehicle out of normal operating parameters, setting off the multiplex code. dtc1525f3 renault top
Because the cruise control has been forced off, it logs DTC1525F3 to explain why it isn't working. It is essentially the car's way of saying, "I’ve disabled the cruise control because I’m worried about something else". Common Primary Culprits damaged vacuum lines