Safety issue, need help

[RamLtd19]

While driving the family to a softball game the truck lit up with tons of warnings and the speedometer was like a windshield wiper. The mileage was flickering between 37770 and “NO BUS”. Truck was driving fine. Has anyone experienced this or know what the problem is?

 

[Eighty]

First guess would be the battery. Causes really strange things to happen with the electronics.
Is your battery pretty old right now?

 

[RamLtd19]

First guess would be the battery. Causes really strange things to happen with the electronics.
Is your battery pretty old right now?

Battery manufactured in Dec’23, installed Jan’24

 

[boogielander]

check ground cable?

 

[RamLtd19]

check ground cable?

I haven’t yet. Recommend a specific one or all of them? As I understand it there are 20+ ground points

 

[boogielander]

I haven’t yet. Recommend a specific one or all of them? As I understand it there are 20+ ground points

start with the battery. then check all. also check the power cables especially the ones in fuse box

 

[RamLtd19]

start with the battery. then check all. also check the power cables especially the ones in fuse box

Whats the “NO BUS” mean?

 

[Richard320]

Any one of your modules could be failing and shorting out the CAN BUS. That's the network that ties everything together, engine, trans, ABS, dash, pretty much everything. Short the wires together and nothing will talk to anything else.

If it were my truck, I would first examine all the battery connections in the fuse box underhood. Then I would look for any aftermarket anti-theft/alarm/tracking devices and remove them. In five years at a Toyota dealership, the only time I ever had a bus failure code, it was caused by a bad antitheft module. And when the topic came up at factory school, it was unanimous- nobody else had ever encountered it with a factory module, it was always from aftermarket stuff.

 

[Eighty]

You’ve got a 2019. Any rear window leaks we should know about? Did you recently experience heavy rain?

 

[Cbty2050]

In five years at a Toyota dealership, the only time I ever had a bus failure code, it was caused by a bad antitheft module. And when the topic came up at factory school, it was unanimous- nobody else had ever encountered it with a factory module, it was always from aftermarket stuff.

Ram isn't Toyota by any means. Bus failures happen frequently on Stellantis vehicles.

Shorted wiring at the rear bumper connectors, blind spot sensors, water in BCM connectors are just a few that I have seen.

 

[kapinallinen2]

RF hub taking a dump due to a water leak could also take down the bus.

 

[RamLtd19]

RF hub taking a dump due to a water leak could also take down the bus.

 

[RamLtd19]

Back window sealed a month ago by dealer for leaking. Was told the rf hub was fine and either way is on back order. Now they won’t return my calls. Had battery drain issues, but this is completely new

 

[kapinallinen2]

Back window sealed a month ago by dealer for leaking. Was told the rf hub was fine and either way is on back order. Now they won’t return my calls. Had battery drain issues, but this is completely new

The hub would possibly be the number one on my list of suspects.

 

[boogielander]

Whats the “NO BUS” mean?

what Richard said lol

 

[RamLtd19]

what Richard said lol

Update: grounds looked ok from what I could see. rf hub ordered. Decided to change the batteries in both fobs to start fresh all around. Been 2 days, no issues. Truck goes to sleep, no battery draining, no warning lights. Fingers crossed it stays this way till the hub comes in.