Case IH 518394-05 - VCM – VCM: Trailer brake pedal control solenoid current low

The control module is detecting an open circuit, abnormally high resistance, or a disconnected wire in the trailer brake solenoid circuit. Note: An official Case IH document also defines this code as 'Fan speed sensor reading indicates zero speed with engine running'.

• MAGNUM AFS Connect
• Magnum 400 AFS Connect (Tier 3)
• Puma (185–260 CVX)
• Maxxum
• Optum

1. 1

   Check the wiring harness for open circuits or high resistance between the VCM and the trailer brake pedal control solenoid.

2. 2

   Verify the presence and correct connection of the controller to the network, and check its voltage supply.

3. 3

   Check for a proper ground connection on the power cables.

1. 1

   Inspect wiring and connectors

   Inspect the wiring and connectors leading to the trailer brake pedal control solenoid for open circuits, corrosion, or physical damage.

2. 2

   Check ground and power

   Check the ground connections and power supply to the VCM and the solenoid.

3. 3

   Diagnose internal failure

   If the wiring and grounds are intact, the fault is likely an internal failure of the solenoid valve assembly or the VCM itself.

4. 4

   Replace solenoid/valve

   Replace the faulty trailer brake solenoid/valve if it has failed internally.

5. 5

   Erase fault code and retest

   Erase the fault code from the VCM and retest the trailer brake system to ensure the code does not return.