Transmission fluid life is determined by monitoring transmission fluid temperature over a period of time. The transmission control module (TCM) calculates transmission fluid life based on a set of temperature ranges stored in TCM memory. As the vehicle is driven, a counter increments. The rate at which the counter increments depends on the temperature range in which the transmission is currently operating. The higher the temperature range, the faster the counter increments. As the counts increment, the TCM will begin to decrease the fluid life percentage from 100, high fluid life, to 0, low fluid life.
If the TCM detects a calculated transmission oil life of 10 percent or less, then DTC P0897 sets. DTC P0897 is a type C DTC.
• | No Transmission Fluid Overtemperature DTC P0218. |
• | No TFT DTCs P0711, P0712, or P0713. |
The calculated transmission oil life remaining is less than 10 percent.
• | The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL). |
• | CHANGE TRANSMISSION FLUID displays on the driver information center (DIC). |
• | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record. |
• | The PCM stores DTC P0897 in TCM history. |
• | The TCM clears the DIC when the condition no longer exits. |
• | A scan tool can clear the DTC. |
• | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring. |
• | The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes. |
Inspect the transmission cooling system for possible blockage and restrictions.
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||
---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Automatic Transmission? | -- | Go to Step 2 | |||||
Important:
Is the action complete? | -- | Go to Step 3 | -- | |||||
3 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 4 | Go to Step 2 | ||||
4 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |