Code Definition

P0659 — Actuator power supply circuit high - Circuit A

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0659

P0659 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0659 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0659 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0659 is set when the Engine Control Module (ECM) detects a higher than normal voltage level in the actuator power supply circuit, labelled as 'Circuit A.' This circuit is tasked with providing power to various actuators in the vehicle, including solenoids, valves, and motor-driven components. A high voltage condition in this circuit can indicate a potential short to power or an internal malfunction within the ECM. Such a high voltage could potentially damage the actuators or lead to their improper operation, affecting the vehicle's overall performance. The ECM routinely checks ...

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