DTC B335: Loss Of CCDIC Serial Data: Description
DTC B335 will set if the ignition is on and the BCM loses data communication with the Combo Panel. Since a loss of data communication with the Combo Panel will result in a "System Problem" display, this code can only be recognized as a "History" code. During this event, The HVAC will divert to 75°F set temperature, front defrost air delivery and automatic blower control.
With a two-way, redundant communication ability built into this system, a double open in the data line must occur to set the fault. A single fault, however, in the Combo Panel power or ground would also cause this DTC to set.