Case IH 12202 – EPL (Electronic Park Lock): Fault On Handbrake Switch Line

Indicates a mismatch between the physical state of the handbrake switch (hardwired to the controller) and the CAN bus data message (VCU_HB_SWITCH parameter in the VCU2EPL message). The controller is seeing conflicting information about whether the parking brake is engaged or released, commonly caused by a dead battery, a cut wire, or a short circuit.

• Puma/Mid Range Magnum
• MAXXUM T4E
• Puma series (Puma 115 through 225, including CVX models)
• Magnum series (Magnum 190)
• Maxxum
• MXM
• MXU

1. 1

   Check battery voltage history to see if the tractor's batteries recently went dead, were disconnected, or were replaced (causes EPL to lose calibration)

2. 2

   Inspect the connector at the handbrake switch, specifically looking for a cut or broken blue wire

3. 3

   Check pins A4 and C7 at the EPL module for a short circuit to ground or a short to the power supply voltage

4. 4

   Verify that the shuttle/reverse lever is properly seated in the parking position

1. 1

   Reinitialize EPL

   Sit in the operator's seat and firmly depress and hold both foot brake pedals.

2. 2

   Reinitialize EPL

   Release the handbrake.

3. 3

   Reinitialize EPL

   Turn the ignition key to the 'RUN' position.

4. 4

   Reinitialize EPL

   Place the shift lever into the Neutral position.

5. 5

   Reinitialize EPL

   Press and hold the Neutral button on the shifter handle. The electronic parking brake should release, and the system will reinitialize, clearing the code.

6. 6

   Test switch continuity

   If the reinitialization does not work, use a multimeter to test the continuity of the handbrake switch contacts (N.C. contact).

7. 7

   Replace switch

   If the switch fails to open/close properly, remove the console trim surrounding the handbrake lever to access the switch. Disconnect the electrical harness, unbolt the faulty switch, and install the replacement.

8. 8

   Repair wiring

   If the switch tests fine, repair the open/shorted wire (often the blue wire) between the switch and the EPL module pins A4/C7.