P0658 Actuator Supply Voltage A Circuit Low

P0658 points to a low condition on Actuator Supply Voltage A circuit. The shared actuator supply is below the voltage expected by the controller.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not condemn the controller until actuator supply A voltage is checked under actual load.

Symptoms of P0658

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0658

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Measure actuator supply A voltage at the controller, relay, fuse, and affected actuators while reviewing freeze-frame data and companion actuator codes.
Inspect for short-to-ground faults, high-resistance power feeds, weak grounds, overloaded actuators, corroded connectors, and harness damage.
Load-test the supply circuit and isolate actuator branches to determine whether a load or wiring fault is pulling voltage low.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.