My Tekonsha Prodigy P2 90885 Will Not Return To &quotC When The Brake Pedal Is Released  

Question:

Helpful Expert Reply:

This is definitely odd. The first thing I recommend doing is plugging the P2 # 90885 that is acting perplexingly into the truck that has the one that is working properly. If it now works properly, there is something going on with the wiring on the vehicle. If it continues with its oddities, then something has gone wrong internally, and it will need to be replaced.

If the controller did work satisfactorily in the other truck, you will need to check the red wire at the back of the controller with something like the # PTW2993 wire tester. Don't start your truck but turn it on and do not press the brake pedal. There should be absolutely no power at the red wire when this is done. If there is no power, move to the next paragraph. If there is power, you will need to find another source for the red wire that does not have power until the brake pedal is depressed. If this was hardwired in and not plugged into a factory port, this will just require testing a few wires to find the correct one. If you did have the factory port though, you will need to take your truck to an auto shop or dealer to have them diagnose and repair the problem.

The only other thing you can do is check to make sure all your ground connections are good. This is the most common cause for an electrical component to misbehave and can be a quick fix, most of the time. If this is installed on a vehicle that had a plug and play port under the dash and a factory 7 Way on the back of the vehicle, it can be quite a bit more complicated, and you will need to visit an auto shop or dealer to diagnose.

expert reply by: Lazer S

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