Case IH F86 – Transmission Controller: Creeper Fails To Engage

This fault code indicates that the transmission controller has commanded the creeper gear to engage, but the system has failed to execute the engagement.

• MXM
• MXM Series
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Maxxum Series
• Maxxum 100 through 140
• Puma Series

1. 1

   Verify battery voltage is sufficient, as low voltage can prevent the clutch solenoids from operating properly

2. 2

   Check for related codes (such as F87, F88, or F89) that point to electrical failures

3. 3

   Inspect the creeper potentiometer and its wiring harness for open circuits, shorts to ground, or shorts to a 5V/12V reference

4. 4

   Test the transmission/creeper clutch solenoids for open circuits or shorts to ground

1. 1

   Resolve Electrical Faults

   If diagnostic checks reveal a short or open circuit in the wiring harness leading to the creeper potentiometer or solenoid, repair the damaged wiring.

2. 2

   Replace Faulty Components

   If the wiring is intact but the potentiometer or solenoid fails bench testing, replace the defective component.

3. 3

   Perform Transmission Calibration

   A transmission calibration is strictly required after replacing a potentiometer, a PWM solenoid valve, or the microprocessor. Place all shift levers in neutral and block the wheels. Enter the H-Menu (Calibration mode HA). Hold the High and Low range buttons and start the engine. "CAL" will appear on the transmission display. Set the engine speed to 1200 ERPM and follow the on-screen prompts to calibrate the transmission clutches.

4. 4

   Clear Codes

   Clear the error codes using the Electronic Service Tool (EST) or calibration menu to ensure the system registers the repair.