P0658
Actuator Supply Voltage A Circuit Low
Actuator supply voltage
Generic OBD-II
Medium
What it means
P0658 means the "A" actuator supply voltage — the feed the ECM uses to power certain output devices (actuators/solenoids) — is reading too low. It's usually a wire shorted to ground or a faulty actuator overloading the circuit. The engine may still run, but any actuator on that supply can stop working, so it's worth tracing before it sets more codes.
Medium
Can I keep driving? Drivable, but low supply voltage can disable one or more actuators and hurt running; get it diagnosed before it triggers more faults.
Common symptoms
What you'll notice
- Check-engine light on
- Multiple actuator-related codes set together
- Rough running, hesitation, or reduced performance
- Possible reduced-power/limp mode
Common causes
Most likely first
- Actuator supply circuit 'A' shorted to groundLikely
- A faulty actuator overloading and pulling the supply lowCommon
- Damaged or chafed wiring in the supply circuitCommon
- Loose or corroded connector terminalsLess often
- Faulty engine control module (ECM), rareLess often
How to diagnose & fix
Work through it in order
- Scan for companion actuator codes on the same supply — they help localize the fault.
- Inspect the supply wiring for a short to ground or chafing.
- Disconnect actuators on that supply one at a time to see if voltage recovers, isolating a shorted actuator.
- Repair the wiring or replace the faulty actuator.
- If the circuit is clean and the fault stays, test the ECM's actuator supply output. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0658?+
The car usually still runs, but a low actuator supply can knock out functions that depend on it and set more codes. Have it diagnosed rather than continuing indefinitely.
Can I just clear P0658?+
It returns while the supply reads low. The real fix is finding the short to ground or the faulty actuator overloading the circuit.
Related codes
Often seen with P0658
Read & clear P0658 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX