P0659 Actuator Supply Voltage A Circuit High

Definition: The OBD-II code P0659 indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the actuator supply voltage “A” circuit. This typically means that there is an issue with the electrical circuit supplying power to one or more actuators, such as solenoids or motors, which are controlled by the PCM.

P0659 – Actuator Supply Voltage A Circuit High

Typical Severity: Moderate

Common Causes

P0659 – Actuator Supply Voltage A Circuit High

Common causes:

• Faulty actuator supply voltage sensor
• Short circuit in the wiring of the actuator supply voltage sensor
• Open circuit in the wiring of the actuator supply voltage sensor
• Corroded or loose connectors related to the actuator supply voltage sensor
• Faulty Engine Control Module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0659

Description: Actuator Supply Voltage “A” Circuit High

Common Misdiagnosis: Replacing the actuator or related components without checking for wiring issues or a faulty powertrain control module (PCM).

 

Common Diagnostic Steps

OBD2 Code: P0659

Description: Actuator Supply Voltage “A” Circuit High

• Check for any blown fuses related to the actuator supply circuit.
• Inspect the wiring and connectors in the actuator supply voltage “A” circuit for damage, corrosion, or disconnection.
• Test the actuator itself for proper operation and resistance values as specified by the manufacturer.
• Use a multimeter to measure the supply voltage at various points in the circuit to identify any discrepancies or high resistance areas.
• Examine related control modules for fault codes that may indicate an issue with communication or power distribution.
• If equipped, check for Technical Service Bulletins (TSBs) related to this code for specific vehicle models.
• Clear the code and perform a test drive to see if it returns after repairs are made.