P07D9: The gearbox is not getting the correct ratio in eighth gear
The gearbox is not getting the correct ratio in eighth gear, that gear is slipping or not engaging properly. It is usually the gearbox oil level or condition, a solenoid valve or internal wear.
| Code | P07D9 |
|---|---|
| System | Engine and transmission |
| Group | P07xx, Transmission |
| Type | Generic: it means the same on every make |
How to read and clear P07D9 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 P07D9 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
- P07D3 The gearbox mode switch E gives a higher signal than normal
- P07D4 The gearbox mode switch F has an electrical fault
- P07D5 The gearbox mode switch F gives a lower signal than normal
- P07D6 The gearbox mode switch F gives a higher signal than normal
- P07DC The gearbox is not shifting properly out of first gear
- P07DD The gearbox is not shifting properly out of second gear
- P07DE The gearbox is not shifting properly out of third gear
- P07DF The gearbox is not shifting properly out of fourth gear
- P0700 Transmission control system: fault detected
- P0701 Transmission control system: range/performance
- P0702 Transmission control system: electrical fault
- P0703 Torque converter/brake switch B: circuit fault
What does code P07D9 mean?
The gearbox is not getting the correct ratio in eighth gear, that gear is slipping or not engaging properly. It is usually the gearbox oil level or condition, a solenoid valve or internal wear.
How do you clear P07D9?
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, P07D9 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.
