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Message: [QUOTE="Wildman, post: 1148715, member: 18533"] First thing is to make sure that nothing aftermarket has been added into the vehicles communication network. Aftermarket modules will cause multiple issues, including some modules reporting a loss of communication with other modules, and the symptoms described. After 3 TCMs, we can be pretty sure that's NOT the problem. TCMs rarely fail on these trucks. Therefore, the problem is with the network circuits to the TCM, the TCM connector (poor pin fitment), or a loss of power or ground to the TCM. Power, Ground, and network circuits are the only thing that a module needs in order to communicate with other modules on the bus. To figure out what is causing the problem, the issue will first have to be duplicated. Then, a network test with the IDS can be performed. Relying on continuous memory DTCs is not the proper method for diagnostics. Once the concern is present, the TCM should fail the network test. Then, the tech can follow the diagnostics published in Section 418-00 of the Ford Workshop Manual to inspect the power, ground, and network circuits to the TCM in order determine the cause of the fault. [/QUOTE]

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