Troubleshooting Flashing PL Code on the Prodigy P3 Brake Controller

Question:

What does a flashing PL mean?

asked by: Robert P

Helpful Expert Reply:

The flashing code PL on the Prodigy P3 brake controller, # 90195, signals that the controller has experienced a power loss.

Some of the possible cause for this code are:
1. The trailer has become disconnected from the trucks 7-way plug.
2. There is a ground issue somewhere on the trailer.
3. Somewhere between the trailer and truck, there is a broken wire.

Checking the trailer electrical plug would be your first step in troubleshooting the problem. Look for corrosion and dirt in the plug as well as making sure the connection is tight.

Using a tester like # PTW2993 you will be able to read it there is any brake signal present at the magnets when the controller is activated using the override lever. If the power reading seems to be low or non-existent, then inspection of the trailer wiring would be the next step.