P0659 indicates the control module has detected voltage in an actuator supply circuit that exceeds the normal operating range. This suggests a short to power or a malfunctioning component drawing excessive voltage. It often affects transmission shifting or throttle response depending on the vehicle design.
Damaged insulation allowing battery voltage to enter the control circuit is the most common cause.
Poor contact within the actuator circuit plugs can cause voltage spikes or irregular readings.
Internal shorts within the throttle body or transmission solenoid can pull voltage high.
A faulty ground path for the control module can cause voltage reference errors.
Issues in the power supply network may disrupt voltage regulation to the actuators.
Internal processor failure is rare and should only be considered after all external circuits are verified.
No, PCM failure is rare; wiring or actuator faults are far more common causes for this code.
It is not recommended, as the vehicle may enter limp mode or shift harshly, risking further damage.
Continued driving may damage the transmission or throttle system due to incorrect voltage supply.
Yes, but specific testing procedures and circuit locations vary significantly by manufacturer.