P0841 JEEP LR Pressure Switch Rationality Fault

Possible causes
– Transmission Solenoid/Pressure Switch harness is open or shorted
– Transmission Solenoid/Pressure Switch circuit poor electrical connection
– Faulty Transmission Solenoid/Pressure Switch
– Internal transmission damage
– Faulty Engine Control Module (ECM)
– Faulty Transmission Control Module (TCM)
Tech description
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 P0841

Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission will not shift gears.
P0841 JEEP OBD Code Description

Low/Reverse (LR).

The Transmission Control Module (TCM) has detected a pressure switch open or closed at an incorrect time.

JEEP Related P0841 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