Code B336 - Loss Of IPC Data: Notes

Code B336 will set if the ignition is on and the BCM loses data communication with the IPC. The problem is a result of a +7 volt power or ground to fault to the IPC, or a double open circuit in the data communication line between the IPC and BCM. If this occurs, the cruise control will disengage (if on) and the headlamps (if on) will be on low beams.

1. This step checks for an intermittent condition.
2. This step checks if the problem is related to the power and ground circuits or the data communication line.
3. This step determines if the data problem is due to the IPC or wiring.
4. This step determines if the fault is due to opens in circuits 800A and 800B or an internal IPC problem.
5. This step checks if the fault is due to the +7 volt power circuit or ground circuit from the CPS.
6. This step checks the ground circuit for an open, a faulty IPC, or a faulty CPS.