No bus error shows on dash
Mine is a 2019 Dodge Grand Caravan,I was driving this morning and all my idiot lights came on and the radio ,turn signals went off. The display showed no bu5(of course it meant no bus). I drove home and shut it down after 3 hours I cranked it back up ,same thing ,turned it off cranked up again everything is back to normal.This happened in January also, I unhooked the battery for 20 minutes and everything was ok. The dealer said it is the can bus ,I want to know how hard is it to fix that can bus? Photo enclosed ,also the wiper blades wont turn off either.
I also removed the wiper blades fuse and the sliding doors fuse.
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Comments
Loss of communication problems run the gambit from being very straight forward and relatively easy (for a properly trained and equipped technician) to being diabolical and extremely difficult. While the problem is occurring, the technician would first concentrate on what modules can communicate and of them which ones are setting codes against what other modules. When modules are confirmed to be missing, the first thing to prove is whether an entire data bus is down or just part of it. For example, the dash is showing "no bus". That fits the symptoms you have described and it "could be" that the only module not communicating with the rest of the car is the instrument cluster itself. If that is the case all of the other modules that need information from the instrument cluster would be setting codes against it. We call these "U" codes, tattle-tale codes. That by the way is what you are erasing when you disconnect the battery. If only codes are set against the instrument cluster, then logic would dictate all of the testing center on the cluster and its powers/grounds/communication circuits. If other modules have codes set against them, then that would have the technician starting with the bus itself, and possibly the gateway module. (likely the TIPM). Every problem like this needs to be diagnosed on its own merits and it really needs to be happening while the technician has the vehicle in the shop. Once the problem is no longer present, there is nothing to find until the next event occurs. It might be wise to preset an arrangement with the shop to suddenly drop in the next time that it happens, if possible, that way they don't have to spend time hoping to get to act up.