P27B1: The internal control unit gearbox range selection gives readings outside the
The internal control unit gearbox range selection gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
| Code | P27B1 |
|---|---|
| System | Engine and transmission |
| Group | P27xx, Transmission |
| Type | Generic: it means the same on every make |
How to read and clear P27B1 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 P27B1 with its description and whether it’s confirmed, pending or permanent.
This code is usually stored by the gearbox control unit. If the car reports it over standard OBD, you read it for nothing with FREE; to read it straight from the gearbox control unit, with its description and clearing, you need PRO.
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
- P279D The four-wheel drive range signal has an electrical fault
- P279E The four-wheel drive range signal gives readings outside the normal range
- P279F The four-wheel drive range signal gives a lower signal than normal
- P27A0 The four-wheel drive range signal gives a higher signal than normal
- P27B2 The internal control unit gearbox range control gives readings outside the
- P27B3 The internal control unit gearbox gear selection gives readings outside the
- P27B4 The internal control unit gearbox gear direction control gives readings outside
- P27B5 The internal control unit gearbox gear ratio control gives readings outside the
What does code P27B1 mean?
The internal control unit gearbox range selection gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
How do you clear P27B1?
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, P27B1 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.
