P0870

Symptoms:
P0870-OD HYDRAULIC PRESSURE TEST FAILURE

When Monitored and Set Condition: P0870-OD 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 > 1000 RPM, the TCM momentarily turns on element pressure to the clutch ckts that don't have pressure to identify the correct pressure sw closes. If the pressure sw does not close 2 times the code sets

POSSIBLE CAUSES
LOSS OF PRIME DTC P0944 PRESENT
RELATED DTC'S PRESENT
INTERMITTENT WIRING AND CONNECTORS
TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
OD PRESSURE SWITCH SENSE CIRCUIT OPEN
OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
INTERNAL TRANSMISSION
TCM - O/D HYDRAULIC TEST FAILURE