Code 28-71 Fuse 1 Open Lockout - Fuse 1 on PCM board is blown or missing.

What does 28-71 mean?

This code appears if Fuse 1 on the PCM board is blown or missing. Fuse 1 powers important components like the PEV, RVS, and Bluetooth module; these will not function. AC units may operate partially, but heat pump units will be completely inoperable.

• Blown or missing Fuse 1 on the PCM board.
• Short circuit in the PEV, RVS, or Bluetooth module harnesses.

Click steps to track your progress.

1. 1

   Visually inspect Fuse 1 on the PCM board. Look for a broken filament or if the fuse is missing.

2. 2

   Inspect the wiring harnesses for the PEV, RVS, and Bluetooth module for any signs of physical damage or short circuits.

3. 3

   If a short is observed, repair the harness before replacing the fuse. Refer to the wiring diagram for proper connections.

4. 4

   Replace Fuse 1 with a new, undamaged fuse of the correct size and type as specified in the wiring diagram.

5. 5

   If the new fuse blows immediately, unplug components from the PCM one by one to isolate the short, then seek professional help.