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Electrical Discuss anything related to OEM & aftermarket electrical devices including: stereos, speakers, video, batteries, starters, the body control module, lighting, etc. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 11-20-2009, 05:20 PM   #1 (permalink)
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Help...Trailer Brake, ABS, Traction Control, and Brake Light are all on

Hey guys,

I went out to my truck during lunch today and fired it up and my message center said to service the trailer brake control, the traction control light is on, the ABS light is on, and the brake indicator light is lit up on the dash. It is a new LMM that I bought 3 weeks ago and it has about 1,500 hundred miles and has ran perfect so far. On Monday I had a boost, pyro, and fuel pressure guage installed along with a Fass 150 and has run just fine since now. Another problem is that the truck won't shut off when I turn the key off and pull it out. It will eventually shut off if I let it sit, but this doesnt make any sense. I wouldn't think that any of the small mods I've made cause this considering it's run perfect until now. Has this happened to any of you and/or do you have any idea's on what's causing this? Any input is GREATLY appreciated.

2013 GMC Denali 2500 HD CC Short Bed.....Black on Black Everything Painted.....MKW M87 20X9 Wheels (Chrome) Wrapped in Cooper Zeon LTZ 305/55/20.....Leveled....Small Fender Mod (No Rubbing)......Bushwacker OEM Fender Flares....Spec D Projector Headlights w/Halo's & LED Running Lights.....6,000K HID's in Low's & Fog's.....Recon Smoked Cab Lights....Waiting For Custom Tuning to be Available!!

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Old 11-20-2009, 06:08 PM   #2 (permalink)
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The warning bells are from a failed ABS component or it's wiring. The ITBC and VSC use the EBCM and it's sensors for operation.

Bigger tires?
Stock tire size?
Where was power tapped for the gauges?
Was something moved when the FASS was installed?
Where was power tapped for the FASS?

Power sources for the FASS and gauges could cause the key off/ still running problem.

Many people incorrectly tap the RAP in the MBEC without using a relay and the BCM's output can become overloaded and/ or damaged.

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