The P0659 trouble code indicates that the actuator supply voltage “A” circuit is registering a high voltage condition. This circuit supplies power to various actuators controlled by the engine control module (ECM) or powertrain control module (PCM). If the ECM or PCM detects a voltage above the specified threshold in this circuit, it will trigger this trouble code.
Actuator Supply Voltage “A” Circuit High
Code symptoms P0659.
1. Illumination of the Check Engine Light (CEL).
2. Other related trouble codes may be present.
3. Engine performance issues, such as hesitation or surging.
4. Inoperative actuators or components controlled by the affected circuit.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0659.
1. High voltage supply from the battery or charging system.
2. Faulty alternator or voltage regulator.
3. Short circuit or excessive resistance in the actuator supply voltage “A” circuit.
4. Corrosion or damage to connectors or terminals in the circuit.
Code Solutions P0659.
1. Check the battery voltage and charging system to ensure they are operating within specifications. If the battery voltage is high or the charging system is overcharging, address those issues first.
2. Inspect the wiring harness, connectors, and terminals in the actuator supply voltage “A” circuit for any signs of damage, corrosion, or shorts. Repair or replace damaged components as necessary.
3. Clear the trouble codes and perform a test drive to verify if the issue persists. If the code returns, further diagnosis may be required.
4. Check the voltage supply at the affected actuator or component using a multimeter to ensure proper voltage is reaching the component when the circuit is energized.
5. If no issues are found with the battery, charging system, wiring, connectors, or voltage supply, the ECM or PCM may be faulty and require replacement.
6. Follow manufacturer-specific diagnostic procedures outlined in the vehicle’s service manual to accurately diagnose and repair issues related to the actuator supply voltage “A” circuit. If needed, seek assistance from a qualified technician or dealership.