P0845

SYMPTOM
P0845 - 2/4 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 PCM 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
- Loss of prime P0944 present
- Related gear ratio and/or pressure switch DTC's present
- Intermittent wiring and connectors
- Transmission control relay output circuit open
- 2/4 pressure switch sense circuit open
- 2/4 pressure switch circuit short to ground
- Internal transmission - 2/4 hydraulic pressure test failure
- 2/4 pressure switch sense circuit short to voltage
- PCM - 2/4 hydraulic pressure test failure