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Possible Causes

WARNING: This page is about a different car, the 2012 Dodge Charger. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
CAN C BUS CIRCUIT SHORTED
CAN C BUS CIRCUIT OPEN
STUCK SPEED CONTROL SWITCH (CRUISE CONTROL STALK)
STEERING CONTROL MODULE (SCM)
ADAPTIVE CRUISE CONTROL (ACC) MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  3.6L - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  or  5.7L - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  or  6.4L - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .