Enabling/Set Conditions And Possible Causes

WARNING: This page is about a different car, the 2022 Chrysler Voyager and 2022 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.

PTU SYSTEM ENABLING CONDITIONS AND FAULT SETTING CRITERIA

The PTU faults have these shared Monitoring Conditions:

With the ignition on.
Battery voltage between 6.0 and 16.0 volts for more than 500 ms.
Engine is not cranking.
No under voltage or over voltage faults present.
No loss of communication with the PTU/RDM smart actuator fault present.

Additional Monitoring Conditions for Circuit/Performace/Internal/Mismatch faults:

No loss of communication with PTU/RDM smart actuator fault present.

Additional Monitoring Conditions for Circuit/Performace/Internal/Loss of Communication faults:

PROXI Configuration is valid.

FAULT SETTING CRITERIA
(C1492-00, C1493-00) - Internal actuator performance PTU actuator faults - (C1492-00) RDM actuator faults - (C1493-00)	The smart actuator detects an internal hardware or software issue.
(C2206-00, C2223-00) - Configuration Mismatch fault	The vehicle PROXI configuration is incorrect or an ECU was swapped in from another vehicle.
(U1203-00, U1204-00) - Loss of Communication Fault PTU actuator faults - (U1203-00) RDM actuator faults - (U1204-00)	Will set for one of the following: No messages received from smart actuator for more than 50 ms. No messages received from smart actuator after ignition was turned off for 60 minutes and after the smart actuator was shut down due to an over-temperature condition. (When smart actuator is shut-down due to an over-temp condition and then the customer turns the Ignition off. If ignition has been off for more than 60 minutes, giving the actuator enough time to cool off, then turned back on and the smart actuator still does not communicate, this DTC will set.)

POSSIBLE CAUSES
FUSED IGNITION SUPPLY TO THE SMART ACTUATOR OPEN/HIGH RESISTANCE OR SHORTED TO GROUND (LOSS OF COMM FAULTS)
GROUND TO THE SMART ACTUATOR OPEN/HIGH RESISTANCE (LOSS OF COMM FAULTS)
INCORRECT VEHICLE CONFIGURATION/INCORRECT DTCM OR SMART ACTUATOR INSTALLED (MISMATCH FAULTS)
FAULTY SMART ACTUATOR
FAULTY DRIVETRAIN CONTROL MODULE (DTCM)

Default Actions:

ALL WHEEL DRIVE (AWD) WARNING INDICATOR: On, except for overtemp fault.
ELECTRONIC VEHICLE INFORMATION CENTER (EVIC) MESSAGE: AWD System Service Required.
PTU SHIFTING: PTU will continue attempting to perform shifts between FWD and AWD.
REAR DRIVELINE MODULE (RDM) CLUTCH: Normal operation unless fault occurred during shift-in-progress.