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Home >> Chrysler >> 2023 >> 300 C >> Repair and Diagnosis >> Engine Performance >> System >> 6.4L - DTCS P0645 To P1621 >> DTC Troubleshooting >> P0685 ASD / Main Control Circuit >> Possible Causes
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Possible Causes

POSSIBLE CAUSES
ASD RELAY COIL SUPPLY OPEN
ASD RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND
ASD RELAY CONTROL CIRCUIT OPEN/HIGH RESISTANCE
ASD RELAY
POWER DISTRIBUTION CENTER (PDC)
POWERTRAIN CONTROL MODULE (PCM)

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