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Possible Causes

WARNING: This page is about a different car, the 2012 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
(D922) PASSIVE ENTRY ANTENNA 2 SIGNAL CIRCUIT SHORTED TO GROUND
(D922) PASSIVE ENTRY ANTENNA 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(D923) PASSIVE ENTRY ANTENNA 2 RETURN CIRCUIT OPEN
(D922) PASSIVE ENTRY ANTENNA 2 SIGNAL CIRCUIT OPEN
(D922) PASSIVE ENTRY ANTENNA 2 SIGNAL CIRCUIT SHORTED TO THE (D923) PASSIVE ENTRY ANTENNA 2 RETURN CIRCUIT
ANTENNA 2
PASSIVE ENTRY MODULE (PEM)