P0897
Transmission Fluid Deteriorated.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 8
- AreaTransmission
- 97
- FaultThe specific fault in that area
What it means
P0897 is the generic code for deteriorated transmission fluid. The transmission control unit has judged the fluid to be past its useful condition, either from a calculated fluid-life or wear model, from temperature and load history, or from a fluid condition input where the vehicle has one. How the fluid is assessed varies by model and gearbox type.
Symptoms
- Gearbox or transmission warning light on, or a service message in the dash
- Harsh, delayed or flared gear changes
- Shudder or judder when pulling away or on light throttle in gear
- Gearbox running hotter than normal
- Burnt smell from the transmission fluid
- Transmission may go into a limp or protective mode in some cases
Possible causes
- Transmission fluid has reached the end of its service life or the service interval has been exceededlikely
- Fluid degraded by overheating from towing, heavy loads, stop-start driving or a poorly performing coolerlikely
- Wrong specification of fluid used in a previous top-up or servicepossible
- Fluid contaminated with clutch or bearing material from internal wear, or with coolant from a failed coolerpossible
- Fluid-life counter not reset after a recent fluid change, so the control unit still thinks the old fluid is fittedpossible
- Faulty transmission temperature sensor or fluid condition sensor giving false readings, where fittedrare
How to diagnose
- Read all stored and pending codes and note any other transmission, temperature or shift-related faults, then review freeze frame data
- Check the service history for when the transmission fluid was last changed and whether the correct specification was used
- Check the fluid level and condition using the method the manufacturer specifies, looking at colour, smell, and any metal or friction material; the procedure depends on the gearbox type
- Inspect for leaks, a damaged or blocked transmission cooler and lines, and check the fluid for signs of coolant contamination such as a milky look
- Review live data for transmission fluid temperature and compare it with engine temperature to check the sensor reads plausibly
- Check whether a fluid-life or adaptation counter exists for this model and whether it was reset at the last service
- Road test and note shift quality, shudder and any slipping to judge whether damage has already occurred
How to fix
- Drain and refill, or carry out a full fluid exchange, with the exact fluid specification and fill procedure for the vehicle, including filter replacement where applicable
- Repair or replace a faulty, blocked or leaking transmission cooler or lines, and rectify the cause of overheating
- Flush and correct the fluid if the wrong type was used, then check shift quality
- Investigate and repair internal wear or contamination if debris or coolant is found in the fluid
- Reset the fluid-life counter and carry out any adaptation procedure the manufacturer requires after a fluid service
- Replace a faulty temperature or fluid condition sensor and check its wiring and connector
Can I keep driving?
Medium severity
The car can usually be driven for a short time, but book it in soon because worn fluid accelerates wear and can lead to expensive gearbox damage. Avoid towing and heavy loads, and stop if the gearbox slips, overheats or smells burnt.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.