Possible causes

– Faulty Pressure Switch Rationality
– Pressure Switch Rationality harness is open or shorted
– Pressure Switch Rationality circuit poor electrical connection
– Internal transmission damage
– Faulty Engine Control Module (ECM)
– Faulty Transmission Control Module (TCM)

Tech notes

There is a factory service bulletin for the following Dodge models:

2004 Dodge Dakota
2004-2005 Dodge Durango
2005 Dodge 300/Magnum
2005 Dodge Dakota

Dodge Factory Service Bulletin OBDII Code P0846

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission will not shift gears.

P0846 DODGE Description

The Transmission Control Module (TCM) has detected a fault in the pressure switch assembly

DODGE Technical Service Bulletins for P0846 code