P0897Transmission Fluid Deteriorated
- Generic OBD-II code · Powertrain
- How the car detects it
- Allison's 'Prognostics' in its fourth and fifth generation controls (1000 to 4000 series, buses and trucks, from 2009) has no fluid quality sensor: the gearbox module calculates. No car maker is known to use these codes. Its oil life monitor counts down the remaining fluid life from operating hours, distance, shifts and load factors such as fluid temperature, open converter and retarder use. With little life remaining, TRANS SERVICE shows for two minutes after every start; if the change and reset do not follow within a set period, CHECK TRANS lights and P0897 becomes active. Correct calculation assumes approved fluid (TES 295/668).
- What you may notice
- CHECK TRANS lamp on
- TRANS SERVICE or wrench indicator after each start beforehand
- Driving usually normal
- Likely causes
- LikelyFluid change interval exceeded
- PossibleFluid changed without resetting the oil life monitor
- PossibleHeavy duty (heat, stop-and-go, retarder) shortens calculated life
- RarePrognostics disabled afterwards (Allison special case)
- Repair
- Medium · Often possible to do yourself.Typical cost: €100 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.