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Old 04-22-2012, 11:57 AM   #1
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Question GM Integrated Brake Controller

I have a 2012 GMC Sierra 3500 HD SRW Duramax with a GM integrated brake controller. I tow a 9,000 lb travel trailer. I've logged 1,500 miles towing since January 2012. I use a Hensley Arrow trailer hitch.

I set gain on the brake controller at 8.0 after following the set-up instructions in the owners manual.

Last weekend I had to perform a panic stop at 40 mph to avoid collision after a car turned left across my path. The force of the stop resulted in the shearing of two of the Hensley shear bolts on the left strut. I repaired the Hensley at the campground and our return trip was uneventful.

I adjusted the trailer brakes today. Very little adjustment was required. To verify they were functional I had my wife apply the brake pedal. There was a 2 to 3 second delay from application of the brakes in the truck to braking on the trailer wheels. If the manual lever was activated on the brake controller, the brakes applied instantly.

Is it normal to have a delay from truck braking to energizing the trailer brakes?

I have noticed that the trailer bumps the tow vehicle much more than my previous vehicle and brake controller.

I have towed the same trailer with an '02 K2500 Suburban with a BrakeSmart brake controller for many years and many miles. The BrakeSmart provided multiple adjustments to provide optimal, smooth braking. The truck and trailer truly braked in harmony.

The GM controller only has a gain setting.

Do I have a problem that needs to be checked by GM? Should I install a more sophisticated brake controller for my safety?

Thanks in advance for your advise and suggestions.
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Previous RV's: '03 MobileScout Titan 29DBS; '01 Sunnybrook Lite 2708 SLE; '99 Coleman Utah
Previous TV's: '02 Chevy Suburban 2500 8.1 4.10; '99 Chevy Express 1500 5.7
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Old 04-22-2012, 02:56 PM   #2
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Isnip.......Is it normal to have a delay from truck braking to energizing the trailer brakes?......snip
You wouldn't think it would..., but I'm not familiar with the new TV OEM integrated brake controllers and how they work (compared to a Prodigy, etc.). One would think that the TT brakes would have a controlled application ramp before the TV's brakes.

I'm sure members that use these integrated units will chime in.

Bob
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Old 04-22-2012, 08:26 PM   #3
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Our 2007 Ford F250 has their version of the integrated brake controler and it works perfectly, I would say that if there is a delay in applying breaking power to the trailer that there is a problem. I set ours at 8.5 on the gain. I'm sure a GM owner will chime in here and give his experience.

Good luck in working out this problem

Steve
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Old 04-22-2012, 09:26 PM   #4
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I couldn't be happier with mine, I have the gain set at 6.5 and it slows everything down so smoothly. I have certainly never experienced a delay, in fact last summer I had to do a panic stop and I was very impressed with how well it did. Sounds like you should make an appointment with your dealership. BTW, are there any trouble codes being thrown?
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Old 04-22-2012, 09:37 PM   #5
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I couldn't be happier with mine, I have the gain set at 6.5 and it slows everything down so smoothly. I have certainly never experienced a delay, in fact last summer I had to do a panic stop and I was very impressed with how well it did. Sounds like you should make an appointment with your dealership. BTW, are there any trouble codes being thrown?
No codes picked up on my Scangauge II.

I guess I'll be making a trip to the dealership.

I Need to tow the trailer next weekend about 50 miles round trip for a camp out with my local camping group.
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Old 04-22-2012, 09:50 PM   #6
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Sorry I couldn't be of more help. Saw your post over on DP as well. If you cycle through the DIC there is a screen that shows the gain setting and the amount that is being applied to the trailer brakes, when you hit the truck brakes is that screen show a delay as well?
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Old 04-22-2012, 10:53 PM   #7
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Originally Posted by dmax_83 View Post
Sorry I couldn't be of more help. Saw your post over on DP as well. If you cycle through the DIC there is a screen that shows the gain setting and the amount that is being applied to the trailer brakes, when you hit the truck brakes is that screen show a delay as well?
No, when my wife pressed hard on the bake pedal, it immediately registered 8. A couple of seconds later the wheel I was spinning manually would stop.

Very strange.

I can't find anyone else having a similar problem or symptom with their GM ITBC.

Why can't I have a normal problem?

The delay explains the numerous Hensley bumps I've experienced.

I only experienced it a couple of times with my Suburban and BrakeSmart controller on 60K+ miles towing. I've had at least a half dozen bumps in 1500 miles with the new truck.
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'13 Excel Winslow 34IKE
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Previous RV's: '03 MobileScout Titan 29DBS; '01 Sunnybrook Lite 2708 SLE; '99 Coleman Utah
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Old 04-22-2012, 11:16 PM   #8
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Yeah, it sounds like something is defiantly not right with your IBC. If it makes you feel any better my duramax has had some shop time for warranty work too.
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Old 04-22-2012, 11:24 PM   #9
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Yeah, it sounds like something is defiantly not right with your IBC. If it makes you feel any better my duramax has had some shop time for warranty work too.
I've been lucky with my 2002 K2500 Suburban and 2011 GMC Yukon Denali. Neither had any warranty issues.

Guess the 3500HD's ITBC is really just a minor problem.
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Old 04-23-2012, 03:43 AM   #10
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Does the integrated controller provide proportional breaking? If the truck and trailer were sitting still, it wouldn't "feel" any inertia and think it didn't need to activate the trailer breaks. I might try "gingerly" testing the system while rolling in a safe location before getting too concerned. Just a thought, please let someone smarter than me chime in.
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