My car is having the CAN COM CIRC fail safe mode error. When i scanned it, i got the U1001 in the freeze frame. I have cleaned all grounds i know of, even the ones behind the dashboard, yet the truck is stuck on this mode. I did a test yesterday by disconnecting the head light and radiator fan fuses on the IPDM, but to my surprise, the radiator and the headlight was still stuck on without their fuses on the IPDM. What this means, is that power has bypassed the fans and headlight fuses on the IPDM and is supplying power to the components. I have replaced the IPDM with a used one and the fault still persists.
What could be wrong?
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