P0659: Actuator Supply Voltage A Circuit High
What to do
May run poorly. Worth prompt attention, because an over-voltage supply can damage the actuators connected to it.
What this code means
The actuator supply is above its expected voltage — a wire touching a higher supply, or a regulator that has failed. As with an over-voltage sensor reference, the actuators on the circuit may be damaged by it, so finding the fault promptly limits what has to be replaced afterwards.
Likely causes
Start here
- Reference wire shorted to battery voltage · moderate
- Chafed harness against engine or bracket · moderate
Less common
- Failed control module · specialist
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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