Case IH 2245 (519182.17) - DEC – DEC: Synchro 8 Solenoid - LSD short to GND

The Low Side Driver (ground-switching circuit) for the transmission synchronizer solenoid (8th gear/range) has found an unintended path to chassis ground before being commanded to close. This is typically caused by a chafed wire touching the tractor frame or an internal short within the solenoid itself.

• MAXXUM T4E
• CX series
• CX90
• CX100
• Quantum series
• MX series

1. 1

   Visually inspect the transmission wiring harness routing from the DEC module to the Synchro 8 Solenoid for pinched wires, rubbed insulation, or areas resting against sharp metal.

2. 2

   Perform a harness isolation test: disconnect the electrical connector at the Synchro 8 Solenoid and at the DEC module, then use a multimeter to test the low-side control wire for continuity to a known good chassis ground.

3. 3

   Test the Synchro 8 Solenoid pins for an internal short to the solenoid's metal housing.

1. 1

   Disconnect battery

   Ensure the tractor is turned off and the battery is disconnected.

2. 2

   Repair or replace wiring harness

   If the wiring harness failed the isolation test, locate the chafed section of the wire. Repair the wire using an OEM-approved splice and heat-shrink tubing, or replace the affected transmission harness section.

3. 3

   Remove faulty solenoid

   If the solenoid itself is internally shorted to ground, remove the retaining bolts for the Synchro 8 Solenoid on the transmission valve block.

4. 4

   Install replacement solenoid

   Remove the faulty solenoid and install the replacement, ensuring the O-rings are lubricated with clean hydraulic/transmission fluid.

5. 5

   Reconnect and clear codes

   Reconnect the wiring harness, reconnect the battery, and clear the fault codes using a diagnostic tool.

6. 6

   Test drive tractor

   Test drive the tractor, specifically shifting through the ranges to ensure the 8th synchronizer engages properly without throwing the 2245 code.