Expert Answers about GMC Yukon XL

• Does the 20 Amp Circuit Breaker for Ultra-Fab Powered Trailer Jacks Reset Itself
• Once an overload condition has ceased then the circuit breaker should reset itself. It is mounted on the outside of jack # UF38-944017 but should not need any persuasion to reset. If the jack is not powering on it could be that an overload or short still exists or something else in the electrical system from the power source to the jack is not working properly. You will also need to check the in line fuse. If it is blown the jack will not operate. If all the wiring is done correctly and...
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• Electric Brakes Not Working when with Factory Brake Controller on 2013 Silverado and 2014 Yukon
• Since we know that the trailer brakes do work since they work with your 2011 Ford F-150, the issue must be with the factory brake controllers in the 2013 Silverado and 2014 GMC Yukon XL Denali. The fact that they are GM vehicles is a clue. Sometimes, for whatever reason, GM will not make the tow package fully functional at the factory. You would have to make some connections under the hood. Even though I have not heard of this being an issue on models with factory installed brake controllers,...
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• Why is There So Much Play On The Ball in My Adjustable Coupler?
• I'm not sure which coupler that is, but I can say that a certain amount of rattling is to be expected because of the space needed to allow the ball to turn inside the coupler-especially with an adjustable coupler. With that being said, you can always test to make sure your connection is secure by using a jack to lift the nose of your trailer while the coupler is hitched to your tow vehicle. As long as the coupler remains locked to the hitch ball when the jack is raised then you can at least...
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• Troubleshooting Trailer that Illuminates Trailer and Vehicle Running Lights When Connected
• There must be a short on the wiring of the trailer you are towing or on the tow vehicle. Sounds like it has to do with the running lights and the 12 volt power circuit. Since it only happens when the trailer is connected I would expect it to be on the trailer side of the situation. Check out the 7-way wiring diagram I attached and compare that to how the 7-way of the trailer is wired. You would also need to look for obvious signs of a short like cut or exposed wiring or corrosion. If...
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• Troubleshooting Trailer Running Lights Not Working Using a 7-Way to 5-Way Adapter, 2008 GMC Yukon
• You will want to make sure that the 5-Way portion of the adapter is pinned out to match the 5-Way on the trailer. You will need a circuit tester like # PTW2993. Test the adapter when it is plugged into the 7-Way on your 2008 GMC Yukon to determine which pin is for the running lights. Then make sure the corresponding pin on the trailer side connector matches. If not, you will need to re-pin either the trailer side connector or the adapter to match. If there is no signal at the adapter,...
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• Troubleshooting Overload Warning on Prodigy P3 Brake Controller on 2002 GMC Yukon XL 2500
• According the the manual, the overload warning appears when the P3 # 90195 detects an excessive current overload condition during operation. The first thing I would do is check the 7-way connection on your 2002 GMC Yukon XL and trailer for any corrosion and clean it out. You may also want to apply dielectric grease like # 11755 for added protection once this is done. If you are still getting the warning you should check all of your ground connections for the trailer brakes. Make sure they...
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• What is Correct Gauge of Wire for Wiring Trailer Brakes
• Yes the issue is related to the wire gauge you have. You need to go with 10 gauge wire like part # 10-1-1 (sold by foot) to deliver the amperage and voltage needed for your brakes to activate. 14 or 16 gauge wire is no where near heavy enough for this task.
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• Trailer Lights Not Working on a Trailer Towed by a 2002 GMC Yukon XL
• The factory trailer wiring harness on your 2002 GMC Yukon XL should already be converted to a combined system even though the vehicle has separate turn signals and brake lights. Whether it has a 4-Way flat or 7-Way connector, the turn signals and brake lights are combined. You can test this with a circuit tester such as # PTW2993 while someone turns on the turn signals and brake lights. It sounds like there is a problem in the wiring either on the vehicle or trailer. Make sure both the...
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• Weight Distribution System to Improve Handling of 3500-lb Pop-Up Camper Trailer Towed by Yukon XL
• Your 3500-lb pop-up camper trailer is well within the towing capacity of the 2015 GMC Yukon XL but when a trailer is more than half the weight of the tow vehicle, which is the case for your set-up, there can be handling issues. The best remedy is to use a weight distribution/sway control (WD/SC) system that does two important things for your towing experience. First, these systems are able to shift some of the trailer's tongue weight (TW) forward, back to the Yukon's front axle. This...
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• How to Wire a Mid-Trailer Turn Signal on a 24 Ft Haulmark Trailer Towed with a 2005 GMC Yukon XL
• If the lights at the middle of your trailer are connected to the turn signal circuit then they will go solid when the brake lights are activated since trailers are wired with a two wire system. There really is no easy fix for this problem that I am aware of. One option is to wire a connector with an extra circuit, if your Yukon has separate yellow turn signals at the rear, I believe most do, you could use a 5-Way connector set like the 5-Way Flat Trailer Wiring Kit, item # HM47890, and...
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• Troubleshooting Electric Brakes on Trailer that Stopped Working
• It sounds like you may just need to adjust the brake assemblies in question on your trailer. To adjust the brake shoes, you will access the brake adjuster from the back of the assembly. You will want to adjust it just until you can no longer turn the trailer wheels by hand, then back off about 10 clicks for the ideal placement. I have attached a video demonstration for you to check out. At the 4:35 mark in the video, you can watch how the brakes are adjusted. If this is not the issue,...
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• Pilot Brake Controller Applies Trailer Brakes Randomly when Towing with 2007 GMC Yukon XL
• There could be some dirt or dust inside the controller that is causing the problem. The easiest way to fix that is to fully apply the manual override and let it snap back into place. Do this several times to clean the contacts inside. If you still are having issues, you can test the brake controller to determine if it is faulty. Sever the blue wire several inches from the back of the controller. Then use a circuit tester such as # PTW2993 to test the end of the blue wire coming out of...
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• Troubleshooting Sway Issues on a 33 ft Trailer With the Fastway e2 Weight Distribution System
• The Fastway e2 Weight Distribution System, # FA94-00-0800, has a built in sway control system and will not support additional sway control systems. A few things that you can check to help with sway issues is to make sure the tongue weight of your trailer is about 10 to 15 percent of your gross trailer weight by adding more weight to the front of the trailer. Too much weight at the back of the trailer can cause trailer sway as well. You could also raise the L-brackets or add washers to...
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• If Brakes Work Properly with the Prodigy P2 # 90885 Should Buzzing Sound be a Concern
• It is interesting that you only hear the buzzing noise when you turn your running lights on. Typically this is a sounds that comes from the brake magnets as you mentioned and shouldn't be an issue, especially if your Prodigy P2 # 90885 and your trailer brakes are functioning normally. You are seeing a little voltage on that brake controller output pin because the P2 sends a pulse charge to sense if a trailer is connected or not. You may want to do a little poking around with your wiring...
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• Troubleshooting Lack of Trailer Brake Power at 7-Way Trailer Connector
• If you have no power on the brake controller output terminal of your 7-way (which is the 5 o'clock pin) then you most likely have a short in your wire or a bad brake controller. I recommend starting your troubleshooting using a circuit tester like # PTW2993 on that pin. If when you hit the manual override on your brake controller, you get no power as you increase the output with the manual override then I recommend next checking directly behind that connector which is normally a blue...
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• No Power To Reverse Lights On Trailer
• It sounds like you are having trouble with the signals and getting power to your trailer connector on your 2003 GMC Yukon XL. The type of trailer socket that carries reverse light signals is the 7-way type, like # 37185, which is included in our 7-way installation kit # ETBC7. Since you did not detect signals when you checked your wiring harness plugs, check the main ground wire to ensure it is tightly attached to a clean bare metal spot on the vehicle. A weak ground can cause some lighting...
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• Trailer Brake Controller Does Not Work with Brake Pedal on a 2011 GMC Yukon
• You may have a blown stop light or CHMSL fuse on your 2011 GMC Yukon. Use the owners manual to locate the fuses. There also may be some connections that need to be made under the hood of the Yukon to make everything fully functional. This is common on GM vehicles, even those with a factory tow package. I have included a link to a help article that explains these connections.
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• Installed Brake Controller is Causing 2010 GMC Yukon XL to Lose Power
• On your 2010 GMC Yukon there are tow package wires located under the dash to the left of the steering column and held together with a white tag. If those are the wires your husband used then they are the correct ones. But sometimes it is possible to accidently connect a brake controller wire to the wrong tow package wire. On your Yukon the red/black tow package wire goes to the controller black wire for 12 volt power. The white wire goes to the controller white wire for ground. The Yukon...
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• Unable to Lower Power Level on Tekonsha Primus IQ Brake Controller
• It sounds like something is drawing full power on the brake output of your Tekonsha Primus IQ Brake Controller # TK90160. This is most likely the reason why the display is showing 12. According to the User Manual, the power output range is from 0.0 to 13. To determine the cause we'll need to test a few things. Start by severing the blue wire coming out the back of your Primus IQ, leaving a few inches of wire to reconnect later. Use a circuit tester like # PTW2993 to check for power. The...
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• Troubleshooting Original Tekonsha Prodigy Error Code
• The error code - - if it is on the bottom means the Prodigy is mounted at too low an angle. If the dashes are at the top, then the Prodigy is mounted to high an angle. This can simply be that it got bumped and needs to be adjusted back to proper position for function. The newer models of the Prodigy controller like P2 # 90885 and P3 # 90195 do not have that mounting specification required.
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