Case IH 2716 (1044.17) - DEC – DEC: HST Solenoid - LSD short to GND

An electrical failure in the transmission control system where the 'Low Side Driver' circuit controlling the Hydrostatic Transmission Solenoid has detected a short circuit to ground (GND).

• VESTRUM CVX
• Case IH Steiger series
• Case IH Magnum series

1. 1

   Visually inspect the wiring harness running from the DEC module to the HST Solenoid for pinched wires, melted insulation, or areas rubbing against the metal chassis.

2. 2

   Disconnect the HST solenoid and use a multimeter to check for continuity between the low-side driver wire and the chassis ground (continuity indicates a shorted harness).

3. 3

   Test the HST solenoid itself for an internal short to ground.

4. 4

   Check the pins on the DEC module connector for corrosion, moisture, or bent pins that could be bridging the circuit to a ground pin.

1. 1

   Power Down

   Turn off the ignition and disconnect the battery to prevent further electrical damage.

2. 2

   Isolate the Short

   Based on the diagnostic checks, locate the exact point of the short circuit.

3. 3

   Repair Wiring / Replace Component

   If the wiring harness is damaged, repair the chafed wire using proper weather-sealed splices, or replace the harness section. If the HST solenoid is internally shorted, remove and replace the solenoid.

4. 4

   Clear Codes

   Reconnect the battery and use a compatible diagnostic scan tool (such as the CNH EST or Jaltest Agricultural Diagnostic Kit) to clear the inactive fault codes from the DEC memory.

5. 5

   Recalibrate

   If transmission components or the DEC module were replaced, perform a DEC transmission calibration procedure using the diagnostic tool before returning the machine to service.