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Acc/fcw, electronic stability control, antilock brake system all need service at once

Steve_T

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I have a 2020 3500 Larmie long bed. Love the truck!

i am cruising down the highway with a 6000 lb trailer under tow.

all of a sudden i get a series of messages flashing at me: (1) acc/fcw unavailable service required, (2) service electronic stability control, (3) service antilock brake system, (4) 4wd temporarily unavailable and (5) trailer brake not operational (dont recall exact words on this 5 th one).

i check my remps (coolant, tranny, oil etc) and i am all good but i pull over anyway. I can manually engage the trailer brake through the brake controller but it feels like it is not working when i press brake pedal.

i stop and turn off engine. I turn it back on. Warnings go away but the check emgine light is on. But no messages/warnings. I can still manually engage trailer brake. After restart 4wd is available. As i am in the middle of Nevada, and my temps arw good i decide to continue on I-80 to Salt Lake City.

i make it (good) but an hour later, same thing. I stop again. Turn off engine. Turn back on and warnings/messages go away but check wmgine light it still on. This repeats one more time.

Thoughts on what went wrong/issue?
 

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Scram1500

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My guess is you have a bad wheel speed sensor or a frayed wire.
 

IvoryHemi

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When that happened to me I ended up needing a new battery
 

Aseras

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I'd say check your grounds. By the hood strut beside the battery. If they are painted over, clean them up. Also follow the negative from the battery to the the block. That strap comes loose and causes all kinds of weird crap. FCA QA at its finest.
 

RamCares

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I have a 2020 3500 Larmie long bed. Love the truck!

i am cruising down the highway with a 6000 lb trailer under tow.

all of a sudden i get a series of messages flashing at me: (1) acc/fcw unavailable service required, (2) service electronic stability control, (3) service antilock brake system, (4) 4wd temporarily unavailable and (5) trailer brake not operational (dont recall exact words on this 5 th one).

i check my remps (coolant, tranny, oil etc) and i am all good but i pull over anyway. I can manually engage the trailer brake through the brake controller but it feels like it is not working when i press brake pedal.

i stop and turn off engine. I turn it back on. Warnings go away but the check emgine light is on. But no messages/warnings. I can still manually engage trailer brake. After restart 4wd is available. As i am in the middle of Nevada, and my temps arw good i decide to continue on I-80 to Salt Lake City.

i make it (good) but an hour later, same thing. I stop again. Turn off engine. Turn back on and warnings/messages go away but check wmgine light it still on. This repeats one more time.

Thoughts on what went wrong/issue?


Thank you for bringing your concerns to our attention @Steve_T! We understand how frustrating this must be. Our team would be happy to address these symptoms further alongside a dealer appointment. Feel free to send us a private message with your VIN so we can get started and let us know if you have any additional questions!

Hannah
Ram Cares
 

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