![]() In addition to this, Node Alive messages are transmitted by each module on the class 2 serial data circuit about once every 2 seconds. Operating information and commands are exchanged among the modules. Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. If you have a after market head unit check all the wires, these trucks get very finicky with stuff going through the CAN Bus. If so re-load your tunes and try her out. I'd re flash to stock, pull all the EFI out of the truck, see if it fixes it's self, if not dump the batteries which will also reset the keep alive memory check for corrosion, on the terminals then restart the truck, see if it's good. Mine did something similar last year after I added an aftermarket aux. ![]()
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