Code B334, Loss Of ECM Data: Notes

Code B334 will set if communication between PCM and BCM is lost. If BCM remains powered and only serial communication is lost, vehicle will still run. With ignition on (engine not running), a LOW OIL PRESSURE message will be displayed followed by an ELECTRICAL PROBLEM message about 25 seconds later.

1. If PCM loses power or ground, code will set since PCM cannot communicate. Engine will not start.
2. Since previous checks eliminated an open circuit, fault is poor terminal contact at PCM terminal 1C2 or 1D1, a faulty MEM-CAL connection or a faulty PCM.