Expert Answers about GMC Sierra Classic
- Can Brake Controller Cause the Trailer Running Lights Not to Work and Fuse Blow on 2007 GMC Sierra
- It might not be the brake controller that is causing the problem. It sounds like there could be a short on the trailer that is causing the fuse to blow. You will want to check the trailer wiring and make sure there are no nicks in the wiring that might have exposed wire touching the metal of the trailer frame. Also check the truck and trailer side connectors for corrosion that might be causing a short. Corrosion can also build up behind the connectors where the wires attach.
The 7-Way...
view full answer... - How to Alleviate Clicking Noise When Towing With Reese 18k Fifth Wheel Trailer Hitch 30081
- I spoke with my contact at Reese about the clicking noise you have been experiencing while towing, and they did confirm that the locking jaw is made to have some slack or play to allow for the pin to rotate, so it should not fit too tightly around the king pin.
To alleviate the clicking sound, the best approach would be to adjust your brake controller to ensure that the braking on your 2007 GMC Sierra and the braking on your trailer are as closely synced up as they can be. When you press...
view full answer... - Troubleshooting Low Power to Trailer Brakes form New Brake Controller on a 2007 GMC Sierra
- It sounds like you are using a proportional brake controller like the Prodigy P3 # 90195 on your 2007 GMC Sierra. If this is the case then there is an internal inertia sensor that helps to determine how much power to send back to the trailer brakes. Since your pickup is sitting still when you apply the brakes with your foot the brake controller and tell that the vehicle isn't moving so it only sends a little power. When you use the manual override it sends max power even though you aren't...
view full answer... - Troubleshooting a Tekonsha Prodigy Brake Controller That is Not Activating w/ the Brake Pedal
- There are a few things that could be wrong, causing a Tekonsha Prodigy P2 Trailer Brake Controller # 90885 or P3 # 90195 to not be functioning with the brake pedal.
The first is whether you are moving or not. The Prodigy needs to sense inertia for the brake controller to activate. If you are parked or moving too slowly, it will not activate with the brake pedal.
Another option would be that the stop light switch on your 2007 GMC Sierra has gone bad, this is not uncommon for late 90's...
view full answer... - Diagnosing a N.C and C Code for a P2 Brake Controller on a 2007 GMC Sierra
- It sounds like somehow your Tekonsha Prodigy P2 Brake Controller # 90885 got put into electric over hydraulic mode based on the codes you are seeing.
To change over to regular electric brake mode you will need to start by pressing the Boost Button for 5 seconds while the brake pedal is pressed until (.r) displayed. While continuing to have the brake pedal pressed, momentarily release the Boost Button for less than one second and then press and continue to hold the boost button down for...
view full answer... - No 12V Power Or Trailer Brake Power To 7 Way Plug on 2007 GMC 2500HD
- If both the 12V and trailer brake circuits on your 7-way have failed at or about the same time the most likely culprit is a corroded or damaged 7-way socket. You can inspect it for any signs of even very slight greenish or whitish discoloration on the contact surfaces. Check both sides of the 7-way. Sometimes if corrosion builds up it can actually bridge two circuits together, causing a short and malfunction of the affected circuits.
If you find any evident corrosion clean or replace the...
view full answer... - Troubleshooting Continuous Power Being Sent from Tekonsha Prodigy P2 Brake Controller
- Even though the Tekonsha Prodigy P2 # 90885 may not be activated through the foot pedal or override switch it does send a small amount of power back to the 7-Way to check for a trailer connection. If you are seeing a little bit of power on the pin in the 5 o'clock position on your 7-Way then that is normal, but if that is also being displayed on your P2 screen then something internall is going on with your controller and you need to replace it.
view full answer... - Troubleshooting 4-Pole Wiring Harness on 2007 GMC Sierra
- One of the most common causes for a 4-pole wiring harness to have one function not operate (or to operate weakly) is a bad ground connection. Since this is easy to check I suggest that you make this your first troubleshooting step. Check that the harness white ground wire's ring terminal is firmly affixed to a clean bare metal spot on the vehicle.
If there is corrosion on the surface, grease or a build-up of road grime then there may not be a good enough ground connection to support all...
view full answer... - Troubleshooting Trailer Wiring that Blinks When Connected
- Is it like an intermittent blink that changes speed or does it blink with a consistent rhythm? My guess is that there's an intermittent connection of the ground circuit of the trailer wiring which is causing the lights to not work consistently. I'd first clean all of the pins of the trailer wiring as most likely you just have some corrosion that is causing an intermittent connection that comes and goes.
I also attached a help article on trailer wiring troubleshooting for you to check out...
view full answer... - Curt Trailer Brake Controller Does Not Power On when Installed on a 2007 GMC Sierra Classic
- There may actually be some additional connections that you will need to make under the hood. Take a look at the article I have linked that covers everything that you will need to do under the hood on your 2007 GMC Sierra Classic.
First make sure you are plugged into the spot in the junction box in the top row, second from the left. Then make sure you have all the connections and fuses in the correct locations. It seems strange but also make sure the fuse you are using is a good fuse and...
view full answer... - Pilot Brake Controller Show .c When Connected To Trailer But Brakes Do Not Activate With Brake Pedal
- With the Pilot 2-6 Brake Electronic Brake Controller # 80550 showing .c it recognizes that it is connected to a trailer. It sounds like you are not getting power to the red wire on the brake controller from the brake switch on your 2007 GMC Sierra.
A Test Light # PTW2993 will allow you to test the power going through the red wire without disconnecting the harness on the controller. If you find there is no power at the red wire the brake switch needs to be checked and replaced if faulty....
view full answer... - Troubleshooting Vehicle Brake Lights Not Working & Trailer Brake Lights Work 2007 GMC Sierra 3500
- First I recommend checking your fuse panels on your 2007 GMC Sierra Classic 3500 cab and chassis. You will want to use a fuse tester like the one in the Kit # PT36ZR to check any fuses which have to do with the factory brake lights on your truck. I do see there are separate fuses for the trailer wiring and the vehicle lights which could be your issue. Also and just to verify you will want to check the bulbs themselves to ensure they did not burn out. If this is not helpful please send me...
view full answer... - No power to New Trailer Brake Controller Install on a 2007 GMC Sierra Classic
- You will likely have to make at least one connection under the hood of your 2007 GMC Sierra Classic to power the brake controller. You may also need a fuse. I have included a link to the right that shows the connections that you will need to make under the hood to make everything fully functional.
view full answer... - Troubleshooting Brake Controller Install of 2007 GMC Sierra Where Wiring Isn't Active
- There are a few connections that need to be made under the hood of your 2007 GMC Sierra Classic for the brake controller wiring to be active. If you check out the install video and help article link I attached to this page you can see exactly how to activate the wiring.
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