Prodigy P2 Brake Controller Troubleshooting N.C. Display on a 2003 Chevrolet Avalanche

Question:

I got our trailer out of storage today and although I tried several times 8-10 to get the n.c. to go out by disconnecting and reconnecting the 7-pin connector, I wasnt successful. I also cleaned the contacts on both the male and female side of the connector. No luck. What I observed with a multimeter is that using the brake pedal, I have no signal going out to the trailer brakes blue wire. However, if I use the manual lever on the controller, I can measure a voltage output at the connector by the hitch and the brakes operate properly that is what I used to get it home. I have also noticed within the last couple of weeks that the n.c. readout on the controller is staying on all the time do not remember when that started. I ordered the controller with a wire harness for my specific vehicle 2003 Chevy Avalanche so it is plugged straight in to the junction box under the dash. No splices and all wires are good. We have had this controller for about 5 years. Could it be defective? We have never had this problem before.

asked by: Dee B

Expert Reply:

The first thing I would do is fully activate the manual lever on the Prodigy P2 brake controller, # 90885, and release it, letting it snap back to the off position several times. This can clean the internal contacts and allow the brake controller to function properly. Sometimes dust and debris get into the controller and cause the manual contacts to remain activated, which could be the issue.

Next, unplug the connector from the back of the Prodigy P2 for 2 to 3 minutes, allowing the brake controller to reset itself. Then plug the unit back in and wait 15 to 25 minutes and allow the brake controller to go into sleep mode.

If the brake controller goes into sleep mode, test to see if the brake controller is functioning normally. If not there is an issue in the vehicle or trailer wiring causing the N.C. reading you are getting.

If the brake controller will not go into sleep mode, you will need to test the red wire exiting the brake controller, for 0 volts when the brake pedal on the vehicle is not activated. If you find any voltage on the red wire when the brake pedal is not activated, this is causing the P2 controller not to go into sleep mode and the vehicle brake switch wire will need to be checked for a short.

If there is no voltage on the red wire then the brake controller most likely has an internal issue and will need to be replaced. Trailer brake controllers have no user serviceable internal parts.

expert reply by: Robert G