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2004 Deville diagnostic code P0897


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It's in the transmission section of the service manual. 


DTC P0897 
Circuit Description
Transmission fluid life is determined by monitoring transmission fluid temperature over a period of time. The powertrain control module (PCM) calculates transmission fluid life based on a set of temperature ranges stored in PCM 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 in. The higher the temperature range, the faster the counter increments. As the counts increment, the PCM will begin to decrease the fluid life percentage from 100, high fluid life, to 0, low fluid life.

If the PCM detects a calculated transmission oil life of 10 percent or less, then DTC P0897 sets. DTC P0897 is a type C DTC.

Conditions for Running the DTC
No transmission fluid temperature (TFT) DTCs P0711, P0712, or P0713.

Conditions for Setting the DTC
The calculated transmission oil life remaining is 10 percent or less.

Action Taken When the DTC Sets
    •  The PCM does not illuminate the malfunction indicator lamp (MIL). 

    •  CHANGE TRANSMISSION FLUID displays on the driver information center (DIC). 

    •  The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records. 

    •  The PCM stores DTC P0897 in PCM history. 

Conditions for Clearing the DIC/DTC
    •  The PCM clears the DIC when the condition no longer exits. 

    •  A scan tool can clear the DTC. 

    •  The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring. 

    •  The PCM cancels the DTC default actions when the fault no longer exists and the DTC passes. 

Diagnostic Aids
Inspect the transmission cooling system for possible blockage and restrictions.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

This step changes the AT fluid and filter. It is important to reset the oil life monitor after the fluid and filter are replaced.

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