Case IH F19 – Transmission Controller: 19th Gear Clutch Solenoid Open Circuit Or Short To Ground

This fault code indicates an electrical failure in the circuit controlling the 19th gear clutch solenoid. The system has detected that the circuit is either broken (open circuit) or that the wiring/solenoid is shorting directly to the chassis ground. When this code is active, the 19th gear function is typically disabled to prevent transmission damage.

• MXM
• Case IH MXM 120
• Case IH MXM 130
• Case IH MXM 140
• Case IH MXM 155
• Case IH MXM 175
• Case IH MXM 190
• Case IH Maxxum Series
• Case IH Puma Series

1. 1

   Check the transmission extension harness to the main harness connection. Ensure the connectors are tight, clean, and free of corrosion.

2. 2

   Disconnect the transmission controller connector and the 19th gear clutch solenoid connector, then use a multimeter to check for continuity on the signal and ground wires between the controller pins and the solenoid pins (Open Circuit Check).

3. 3

   With the connectors unplugged, check for continuity between the solenoid signal wire and the tractor's chassis ground to identify any shorts in the wiring harness.

4. 4

   Test the internal resistance of the 19th gear clutch solenoid itself to determine if it is completely open (infinite resistance) or shorted internally.

1. 1

   Resolve Wiring Issues

   If the diagnostic checks reveal a broken wire or a short to ground in the harness, repair or replace the affected section of the transmission wiring harness.

2. 2

   Replace the Solenoid

   If the wiring tests perfectly but the solenoid fails the resistance test, locate the 19th gear clutch solenoid on the transmission control valve block and replace it.

3. 3

   Reassemble and Clear Codes

   Reconnect all harnesses and clear the stored fault codes from the transmission controller memory.

4. 4

   Perform Transmission Calibration

   Any time a PWM solenoid valve is replaced, a mechanical repair is made, or the non-volatile memory is reset, you must perform the Auto Calibration Procedure (ACP) / Transmission Clutch Calibration. Warm the transmission oil, set engine speed to 1200 ERPM, and use the tractor's digital display to run the H1 Clutch and Synchroniser Calibration until "END" is displayed.