DTC B336: Loss Of IPC Serial Data: Description

Code B336 will set if the ignition is on and the BCM is not able to exchange data with the IPC. The problem is a result of a 7 volt power or ground fault to the IPC, or 2 opens in the data communication line between the IPC and the BCM. If this occurs, the cruise control will disengage (if on), and the headlamps (if on) will be on low beams.