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Troubleshooting Service Brake Controller Dash Error Code with No Trailer Connected  

Question:

Yes it will sometimes show a service trailer brake codes when there is no trailer attached...Not every time...

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Expert Reply:

Does error code happen when trailer is disconnected too? Or just when connected?

expert reply by:
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Jameson C

Roger M.

1/19/2022

Yes it will sometimes show a service trailer brake codes when there is no trailer attached...Not every time...

Jameson C.

1/19/2022

That means the issue is on your vehicle wiring and not the trailer side. I would start by inspecting the trailer connector at the rear of the truck and clean off all corrosion and dirt and then from there inspect the wiring on the back side of the connector and make sure there's no obvious signs of a short like exposed or cut wire and/or corrosion there as well. I attached a help article on troubleshooting trailer wiring for you to check out as well.

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