I had an Expedition that would cutoff at highway speeds. Five dealers could not find the problem but each charged me for troubleshooting or something else. When I went into dealer six the Service Advisor said Expedition, F150 Chassis, F150 Service Bulletin and found the issue was a wire shorted to ground and fixed the issue free of charge. I had 5 Fords at the time and that dealer got all my service work going forward.
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