Case IH 24 – Transmission Controller: None of the transmission clutches are calibrated

The clutch pack pulse-width modulated (PWM) solenoid calibration values are out of the acceptable range or are not registered in the system. This is typically triggered by a new transmission controller installation, an erased/reset non-volatile memory (H8), or an incomplete clutch pack calibration procedure.

• MX Magnum
• STX Steiger
• JXC
• Case IH Magnum Series
• Magnum 235-340 Series 4
• Case IH TG Series
• Case IH Maxxum Series
• MXM 120-190
• Case IH Puma Series
• Case IH STX Steiger 4WD Tractors
• Case IH JX Series
• JX1090U

1. 1

   Check controller configuration: Verify the controller is configured to the correct transmission type (resolve fault code C0 first if present)

2. 2

   Warm up the tractor: Ensure the hydraulic/transmission fluid is at normal operating temperature before attempting calibration

3. 3

   Check for voltage/sensor codes: Ensure there are no active codes for battery voltage (e.g., Code 70) or wheel speed sensors (e.g., Code 77) that can prevent calibration

1. 1

   Start the tractor and ensure the hydraulic fluid is up to operating temperature.

2. 2

   Enter the tractor's "H" menu (Diagnostic/Service Mode).

   On many models, this is done by holding the upshift and downshift buttons simultaneously while starting the tractor.

3. 3

   Navigate through the HH Transmission Service Menu to segment H1 (Clutch Calibration).

4. 4

   Put the tractor in gear.

   The tractor will not actually drive while in diagnostic mode, though it may lurch slightly.

5. 5

   Hold the upshift button to begin the automated calibration.

   The controller will systematically engage each clutch pack, measuring the electrical current (mA) required to cause a measurable drop in engine RPM.

6. 6

   Continue following the on-screen prompts until all clutch packs (A, B, etc.) have been successfully calibrated.

7. 7

   Exit the diagnostic menu and restart the tractor to verify Code 24 has cleared.