DTC B334: Loss Of Pcm Data: Description

Code B334 will set if the ignition is ON and the BCM is not able to exchange data with the PCM (if any other communication codes are stored along with B334, see MULTIPLE INTERMITTENT CODES  ). When this is the only communication code stored, the problem must be one of the following:

• An open CKT 800D and 800E.
• An open or short to ground in CKT 1039 or 480.
• A faulty PCM or PCM CAL-PAC.

During the time the failure is present, a failsoft value equal to 100°C will be used for the coolant temperature, the cooling fans will be commanded to high speed, and no PCM diagnostic information will be available for display. The SYSTEM FAULT message, will be displayed on the DIC. Also, while in the service diagnostic mode, this code will remain active, always checking for proper operation.