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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 213 (6.7L - DTCS P0606 To P2262 - 2500 & 3500) >> Diagnosis And Testing >> P0646-A/C Control Circuit Low >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
LOW VOLTAGE SUPPLY TO THE TIPM
(C13) A/C CLUTCH COMPRESSOR CONTROL CIRCUIT OPEN/HIGH RESISTANCE
(C13) A/C CLUTCH CONTROL COMPRESSOR CIRCUIT SHORTED TO GROUND
TOTALLY INTEGRATED POWER MODULE (TIPM)
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L  .