New GMC 2500 Wont Engage Trailer Brakes

BenK wrote:
Most manual lever actuation will bypass the logic circuit (controller) and send power to the trailer brake wire, but am assuming they are all the same in logic.

My P3 also bypasses the logic circuit and sends power to the trailer brake wire

Question: are the OEM integrated brake controllers manual lever variable or just on/off in function ?

Also, my P3 (stolen and have to purchase another soon) leads the TV brakes. Even in a panic jab at the TV brake pedal.

Once power has been sent to the trailer wire by the P3, the accelerometer in the P3 takes over to proportion the power sent to the trailer wire.

Of course factored by the preset, but if the accelerometer senses building G forces, it will meter out up to full power to the brake wire.

Can and have stopped the whole setup without ever pushing the TV brake pedal far enough to developer MC PSI (not freeway, but it could and take longer with just trailer brakes…which will have the P3’s accelerator send ever more power once it senses whatever G forces vs preset). Try that with any highly integrated brake controller that uses MC PSI as the determining sense.

If one of these integrated trailer brake controls also has a brake pedal light switch sense, then it might likewise be able to stop the whole setup without ever developing MC PSI, but to date, have not read of that

Nothing wrong with OEM integrated brake controllers. Just not for me and if I do purchase another TV and it has a highly integrated brake controller…I’ll continue to go with a P3

I had a P3 on my 2004 silverado. IMHO the GM IBC on our 2015 Denali is light years ahead and orders of magnitude better than the P3.
smoother, quicker acting, better modulation

As I mentioned in an earlier post I had to do a panic stop from 60mph ABS on full, truck and trailer stayed absolutely straight and trailer braking compared to the P3 was way better.