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.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- Transmission limp mode or fixed gear
- Several actuators not working
- Check engine light (GM from 2017)
- Codes for individual solenoids
Most likely causes
- Actuator supply wire shorted to ground
- Actuator (solenoid) shorted internally
- Transmission harness or connector (also open, in transmission modules)
- Module internal (main cause on the Saab diesel)
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P0658 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 6: Control modules and outputs
- 58: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0658?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P0658?
The most common causes are: actuator supply wire shorted to ground; actuator (solenoid) shorted internally; transmission harness or connector (also open, in transmission modules).
Related codes
- P0657Actuator Supply Voltage A Circuit/Open
- P0659Actuator Supply Voltage A Circuit High
- P2670Actuator Supply Voltage B Circuit Low
- P2669Actuator Supply Voltage B Circuit/Open
- P0641Sensor Reference Voltage A Circuit/Open
Sources
- law.cornell.edu: 13 CCR 1968.2
- gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
- gsi.ext.gm.com: 25OBDG03A
- gsi.ext.gm.com: 20OBDG03A Diagnostics
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.