P0846 JEEP 2-4 or 2C Pressure Switch Rationality

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 Jeep models:

2003-2005 Jeep Wrangler
2003-2005 Jeep Liberty
2003-2005 Jeep Cherokee

Jeep Factory Service Bulletin OBDII Code P0846

Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission will not shift gears.
P0846 JEEP Description
The Transmission Control Module (TCM) has detected a fault in the pressure switch assembly
JEEP Technical Service Bulletins for P0846 code
2003 JEEP LIBERTY ELECTRICAL SYSTEM
2003 JEEP WRANGLER ELECTRICAL SYSTEM
2004 JEEP LIBERTY ELECTRICAL SYSTEM
2004 JEEP WRANGLER ELECTRICAL SYSTEM
2005 JEEP LIBERTY ELECTRICAL SYSTEM
2005 JEEP WRANGLER ELECTRICAL SYSTEM
2003 JEEP CHEROKEE ELECTRICAL SYSTEM
2005 JEEP GRAND CHEROKEE ELECTRICAL SYSTEM