Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer communications
6Original wording in English
ALLISON
Details a procedure for trouble shooting the check transmission MIL based on DTC P2789
ALLISON
Details a procedure for trouble shooting the check transmission MIL based on DTC P2789
ALLISON
Provides servicing tip for DTC P2789 in IC bus and software reflash instructions
ALLISON
Advises service channel to reflash TCM if DTC P2789 is triggered for specific serial numbers
Check vehicle applicability
3A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Allison | 1000 SERIES TRANSMISSION ↗ | Year unknown |
| Allison | 2000 SERIES TRANSMISSION ↗ | Year unknown |
| Allison | TRANSMISSION ↗ | Year unknown |
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.