Case IH 12965 – Trailer Brake Controller: Trailer Brake Controller Internal Fault

The internal circuitry, software, or hardware of the module responsible for managing the pneumatic or hydraulic trailer brakes has experienced a critical internal failure.

• MAXXUM T4E
• Farmall 40
• Farmall 45
• Farmall 50
• Puma 150
• Puma 165
• Puma 175
• Puma 185
• Puma 200
• Puma 220
• Puma 240

1. 1

   Verify internal failure of the Trailer Brake Controller (no specific diagnostic tree is provided for this code as it indicates an internal module failure)

1. 1

   Replace the Trailer Brake Controller

   Replace the faulted controller entirely, as internal board-level components are not serviceable.