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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 BUS OPEN OR SHORTED CONDITION
BODY CONTROL MODULE (BCM)
ADAPTIVE CRUISE CONTROL MODULE (ACC)

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  .