Troubleshooting Tekonsha Prodigy P2 Brake Controller Flashing C And Truck Not Starting

Updated 05/18/2017 | Published 05/17/2017

Question:

I installed a Prodigy 2 on my Ford F150 as soon a I plug in the wires there is a flashing C and it is not connected to my truck and then my truck wont start. Im not sure where this issue is coming from your suggestions would be appreciated thank you.

asked by: Doug D

Expert Reply:

The flashing C on your Tekonsha Prodigy P2 Trailer Brake Controller # 90885 sounds like there is corrosion on the brake output circuit of your vehicle 7-way. When the controller detects a load on the circuit (typically from the trailer brake magnets) it will say that it is connected to a trailer even if it is not. Corrosion can cause a slight short on the circuit which then can trick the controller into thinking there is a trailer connected. The slight short causes a small draw on the circuit that the brake controller reads as a connected trailer.

I would recommend cleaning the pins of your trailer 7-way with some fine grit sandpaper and that particular problem should go away. I have attached a help article on brake controller troubleshooting for you to check out for additional help.

The issue with your battery sounds like a battery issue and is most likely not connected to the brake controller. Your battery may need to be more fully charged or replaced.

expert reply by: Jason S