Duramax Diesels Forum Truck of the Week
  #1  
Old 10-08-2016, 07:20 PM
pavetim pavetim is offline
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Default Service trailer brake?

Not really a tunning question but anyways I got a service trailer brake error once but since I towed my rv yesterday now I get it everytime I start the truck, Trailer brakes worked good yesterday too
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Old 10-09-2016, 06:54 PM
duramaxmt duramaxmt is offline
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check for codes maybe your brake switch under the dash
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Old 10-09-2016, 06:59 PM
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Moved to towing.

Have you double checked the wiring and connections from the truck all the way back to the brakes? Any chafing or wear thru?
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Old 10-10-2016, 12:08 PM
pavetim pavetim is offline
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Hooked up my rv today and no brakes. I am going to look for the obvious things but dealer wants $95 to diagnose. You think the integrated controllers are good enough to warrant the money to have it fixed? Or go with a P3 and forget the integrated one? Trying to find prices on a brake max but can't find much on supposedly the best controller out there
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Old 10-10-2016, 06:11 PM
Ron Nielson Ron Nielson is offline
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If your message on the DIC says 'SERVICE TRAILER BRAKE SYSTEM' the problem is your truck, not your trailer. If you get a message that says "CHECK TRAILER WIRING" , that's the trailer problem. So make sure you look carefully at the error message.

Here's a pretty good discussion about the problem: http://www.justanswer.com/chevy/4jjy...gm-tech-s.html
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Old 10-10-2016, 06:29 PM
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I had the same thing happen on my truck, only did it on one of my trailers, found there was an exposed wire on the trailer brake wire going into the brakes.
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Old 10-10-2016, 06:54 PM
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Does your cruise control work properly?
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Old 10-11-2016, 06:20 AM
pavetim pavetim is offline
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Yes cruise works fine. I read it was probablycthe relay under the rear. Guess three are only three components in the system. I ordered a relay it's only $35
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Old 10-11-2016, 06:24 AM
pavetim pavetim is offline
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I have efilive but not showing any codes I'll take it into autozone and see if they pull any code or maybe see if i can talk dealer into seeing if there are codes for me al tho probably charge me no matter what anyways
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Old 10-13-2016, 01:55 PM
pavetim pavetim is offline
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Well changed relay and didn't fix so guess I'll start looking for wires
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Old 10-15-2016, 02:16 PM
pavetim pavetim is offline
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Ok strange happenings. I hooked it up to truck then turned key on. Now it says trailer connected and the bars increase with gain but when i turn truck off and disconnect and turn truck back on it says service trailer brake system. Why is it giving an error if it seems to work fine?
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Old 10-22-2016, 02:15 PM
pavetim pavetim is offline
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Ok not aure if connected but other issued just popped up. My cruise works fime but the green light on Speedo doesn't come on when set and my compass isnt working it just shows 2 dashes
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Old 10-24-2016, 05:25 AM
pavetim pavetim is offline
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Oh and now steering wheel heater doesnt work, light for how haul mode doesnt come on. 381 views amd no other ideas?
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Old 10-28-2016, 05:23 PM
Ron Nielson Ron Nielson is offline
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If you have camper wiring option, check those wires and make sure they can't make electrical contact with anything. I wrapped mine in plastic, then wrapped with tape.
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Old 11-14-2016, 08:23 AM
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Have you found anything yet to cause the issues? Sounds like a loose wiring harness with all of those different issues being intermittent like that.
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