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Possible Causes

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
(K604) DRIVETRAIN SIGNAL CIRCUIT SHORTED TO GROUND
(K604) DRIVETRAIN SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
RDM HYDRAULIC PRESSURE SENSOR
DRIVETRAIN CONTROL MODULE (DTCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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