P0658 code meaning
Actuator Supply Voltage A Circuit Low
Powertrain system Generic code P06xx codes Check engine light
What P0658 means
Actuator supply A is a high-side switch feeding several actuators together; its use differs by maker (Ford transmission solenoids, GM shared high-side driver, GM Europe 2.0 CDTI internal 5 V supply). P0658 means the supply output is too low with the driver on – a short to ground (0.5 Ω or less). GM's engine module checks its shared high-side driver in 20 of 25 samples; the lamp rating changed from none (2016) via two trips (2017–18) to the first trip (2025). GM's transmission modules include an open circuit here, set it in the first trip and block the solenoid diagnostics, so the gearbox goes into limp mode. On GM Europe's 2.0 CDTI it means the internal 5 V supply is too low – no MIL, and if it recurs, the engine module is replaced.
P0658 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0658
- Transmission limp mode or fixed gear
- Several actuators not working
- Check engine light (GM from 2017)
- Codes for individual solenoids
Common causes of P0658
- Most likelyActuator supply wire shorted to ground
- PossibleActuator (solenoid) shorted internally
- PossibleTransmission harness or connector (also open, in transmission modules)
- PossibleModule internal (main cause on the Saab diesel)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Actuator supply circuitTransmission solenoidsControl module
What each part of P0658 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 58 | The exact fault in that area. |
What to do next
- Note P0658 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0658
What does P0658 mean?
P0658 means "Actuator Supply Voltage A Circuit Low". Actuator supply A is a high-side switch feeding several actuators together; its use differs by maker (Ford transmission solenoids, GM shared high-side driver, GM Europe 2.0 CDTI internal 5 V supply). It is a generic code, so it means the same on every make.
Is it safe to drive with P0658?
Drive gently and only to a workshop. With P0658 the car can go into limp mode (reduced power) to protect itself.
Will P0658 fail an emissions test?
Yes, it can. P0658 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0658 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0658 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.