P1728

P1728 - 2C HYDRAULIC PRESSURE TEST FAILURE

When Monitored and Set Condition:
P1728 - 2C HYDRAULIC PRESSURE TEST FAILURE

When Monitored: In any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter.

Set Condition: After a shift into a forward gear, with engine speed above 1000 RPM, the TCM momentarily turns on element pressure to the Clutch circuits that don't have pressure to identify the correct Pressure Switch closes. If the Pressure Switch does not close 2 times, the DTC sets.

POSSIBLE CAUSES:
RELATED LINE PRESSURE DTC'S PRESENT
RELATED PRESSURE SWITCH AND/OR SPEED RATIO DTC'S PRESENT
INTERMITTENT WIRING AND CONNECTORS
INCORRECT FLUID LEVEL
2C PRESSURE SWITCH SENSE CIRCUIT OPEN
5-VOLT SUPPLY CIRCUIT OPEN
POOR LINE PRESSURE SENSOR CONNECTION
TRANSMISSION RELAY OUTPUT CIRCUIT OPEN
2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
EXCESSIVE DEBRIS IN OIL PAN
INTERNAL TRANSMISSION PROBLEM - 2C PRESSURE TEST
LINE PRESSURE SENSOR
TCM - 2C PRESSURE SWITCH
TCM - NO 5 VOLT - LOW LINE PRESSURE SENSOR