P0658: Actuator Supply Voltage A Circuit Low
What to do
May run poorly. Several actuator faults stored at once usually share one supply — ask for that supply to be measured before parts are replaced.
What this code means
The actuator supply is below its expected voltage, usually because a shorted actuator is loading it down. Disconnecting actuators on the affected supply one at a time identifies the culprit, the same procedure that resolves a reference voltage fault.
A solenoid that has failed short internally is the most common single cause.
Likely causes
Start here
- Shorted actuator dragging the supply down · moderate
- Signal wire shorted to ground · moderate
- Corroded or loose connector · easy
Less common
- Failed ECM power relay · easy
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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