P2685: The actuator power supply voltage C is below normal
The actuator power supply voltage C is below normal. It usually comes from the battery, the alternator or a poor connection.
| Code | P2685 |
|---|---|
| System | Engine and transmission |
| Group | P26xx, Auxiliary outputs and cooling |
| Type | Generic: it means the same on every make |
How to read and clear P2685 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2685 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2681 The engine coolant bypass valve control has a broken or disconnected wire
- P2682 The engine coolant bypass valve control gives a lower signal than normal
- P2683 The engine coolant bypass valve control gives a higher signal than normal
- P2684 The actuator power supply voltage C has a broken or disconnected wire
- P2686 The actuator power supply voltage C is above normal
- P2687 The fuel power supply heater control has a broken or disconnected wire
- P2688 The fuel power supply heater control gives a lower signal than normal
- P2689 The fuel power supply heater control gives a higher signal than normal
What does code P2685 mean?
The actuator power supply voltage C is below normal. It usually comes from the battery, the alternator or a poor connection.
How do you clear P2685?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2685 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
