Case IH 12151 – EPL (Electronic Park Lock) Controller: Logic core – second microprocessor not present

This code indicates an internal hardware or logic failure within the control module, specifically that the primary processor cannot communicate with or detect the secondary microprocessor.

• Puma/Mid Range Magnum
• MAXXUM T4E
• Puma Series: 140, 165, 180, 195, 210, 225, 240 (CVX / FPS / SPS)
• Magnum Series: 180, 190, 210, 225, 255, 285 (CVT and Powershift)
• Maxxum Series: 100-140
• Optum Series: 300 CVX
• Vestrum Series
• Steiger Series

1. 1

   Verify that the tractor's batteries are fully charged and holding proper voltage. A dead battery or severe voltage drop during cranking can cause the EPL module to lose its memory or fail to boot its secondary processor properly.

2. 2

   Enter the tractor's diagnostic 'H-Menu' using the instrument cluster switches (navigate to the XA module).

3. 3

   Go to menu H8 to clear stored calibration information and EEPROM fault codes.

4. 4

   Cycle the key. Go to menu HB to display stored fault codes. If 12151 returns immediately, the EPL controller has suffered a hard internal failure and must be replaced or sent out for remanufacture.

1. 1

   Power Down

   Turn off the tractor and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Locate and Remove the EPL Module

   Locate the Electronic Park Lock actuator/controller. Disconnect the main wiring harness connector from the module.

3. 3

   Dismount

   Remove the mounting hardware securing the EPL module to the bracket and remove the faulty unit.

4. 4

   Install New Module

   Mount the replacement EPL module and securely tighten the hardware. Reconnect the wiring harness.

5. 5

   Restore Power

   Reconnect the negative battery cable.

6. 6

   Calibration

   A new EPL module will not function until it is calibrated. Park the tractor on a flat, open surface.

7. 7

   Run H1 Calibration

   Enter the H-Menu, navigate to the XA module, and select menu H1 (Calibration procedures). You will need to calibrate the EPL applied position, the released position, and the internal accelerometer following the on-screen prompts (using the 'h' and 'm' buttons to confirm positions). Alternatively, this can be done using the Case IH Electronic Service Tool (EST) laptop software.