C0548: The vacuum sensor power supply voltage is below normal
The vacuum sensor power supply voltage is below normal. It may be the sensor itself, its connector or the wiring.
| Code | C0548 |
|---|---|
| System | Chassis |
| Group | C05xx, Chassis |
| Type | Generic: it means the same on every make |
How to read and clear C0548 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 C0548 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
- C0542 The brake pressure sensor B gives a lower signal than normal
- C0543 The brake pressure sensor B gives a higher signal than normal
- C0544 The brake pressure sensor B has a broken or disconnected wire
- C0547 The vacuum sensor power supply voltage has a broken or disconnected wire
- C0549 The vacuum sensor A has a broken or disconnected wire
- C054A The vacuum sensor A gives readings outside the normal range
- C054B The vacuum sensor A gives a lower signal than normal
- C054C The vacuum sensor A gives a higher signal than normal
What does code C0548 mean?
The vacuum sensor power supply voltage is below normal. It may be the sensor itself, its connector or the wiring.
How do you clear C0548?
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, C0548 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.
