P0870

Symptom:
P0870-OD HYDRAULIC PRESSURE TEST FAILURE

Test 1-4:

Test 5-8:

Test 9-12:

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 that don't have pressure to identify the correct pressure closes. If the pressure 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
- TRANSMISSION CONTROL MODULE