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Old 02-24-2018, 10:12 AM   #1
bullroc3
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Unhappy 2015 Chevy Trailer Brake Problem

Last Sunday, I had the 2015 Duramax out for a short trip. It has not been driven much this winter as I have been recovering from hip replacement surgery mid January (All is well now). I started the truck and got a message to "service trailer brake system. I got to my destination and later restarted the truck and got the same message. Called the dealer and took it in for service. The morning that I was to head to the dealer, no message. I figured a code would be set in the computer.

After inspection, they found the 30 amp "special fuse" was blown. I told them that the last time it was hooked to a trailer was the end of October. I have both the Montana and a Big Tex tandem axle dump trailer. The truck was driven a bit since then, maybe 200 or so miles. No messages since then until now. They replaced the fuse and tested it on a 7 pin trailer that they have around and all was well again. I asked to see where this fuse was located and they showed me. It is the only pink one in the under-the-hood fuse box. The mechanic told me that if it happens again they would have to check out the entire wiring from front to back.

I was wondering if anyone else has experienced this problem.
 
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Old 02-24-2018, 10:27 AM   #2
hunts800
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Not sure you have the same problem, but symptoms are the same. My 09 duramax kept giving same message, ultimately dealer replaced the trailer fuse. Solved for awhile then came back. After numerous diagnostics by Chevy and my RV dealer, discovered that the brake wire which runs through the center of the axle was shorting out against the axle since the insulation had been worn through. Only occurred intermittently since wires only shorted when hit a bump. RV dealer ran brake wires outside the axles so they can be inspected. Problem has never reoccurred.
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Old 02-24-2018, 01:55 PM   #3
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Originally Posted by hunts800 View Post
Not sure you have the same problem, but symptoms are the same. My 09 duramax kept giving same message, ultimately dealer replaced the trailer fuse. Solved for awhile then came back. After numerous diagnostics by Chevy and my RV dealer, discovered that the brake wire which runs through the center of the axle was shorting out against the axle since the insulation had been worn through. Only occurred intermittently since wires only shorted when hit a bump. RV dealer ran brake wires outside the axles so they can be inspected. Problem has never reoccurred.
Brother-in-law had the exact same issue, same cause on his 2017 Silverado.
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Old 02-24-2018, 02:59 PM   #4
bullroc3
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This problem showed up without either trailer attached. I checked the Duramax forum and I guess this is a common problem with several causes. One poster went as far as contacting the National Highway Traffic Safety Association about it.
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