New Holland 14092 – TCM: Transmission Output Speed Sensor Short to Ground

The fault code 14092 indicates that the electrical signal from the transmission output speed sensor is being diverted to the vehicle's chassis ground before reaching the Transmission Control Module (TCM). This short circuit interrupts the speed data signal, causing the controller to lose crucial information needed to determine ground speed and control automatic shift points. Consequently, this can result in erratic shifting, an inaccurate speedometer, illumination of the transmission warning light, or a complete failure to shift.

• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T7030
• T7040
• T7050
• T7060
• T7070
• T7.170
• T7.185
• T7.200
• T7.210
• T7.220
• T7.230
• T7.235
• T7.245
• T7.250
• T7.260
• T7.270
• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• TM190
• TS100A
• TS110A
• TS115A
• TS125A
• TS135A
• TS90
• TS100
• TS110
• TS115
• TL70
• TL80
• TL90
• TL100
• TG210
• TG230
• TG255
• TG285
• TG305

1. 1

   Visually inspect the wiring harness leading to the transmission output speed sensor for signs of damage, chafing, cuts, melting, or corrosion.

2. 2

   Inspect the electrical connectors at the sensor and the TCM for corroded, bent, or pushed-out pins, and ensure they are free of moisture or debris.

3. 3

   Perform a sensor resistance test: disconnect the sensor (e.g., connector C038 on some models) and measure resistance between its two pins. Expected reading is 0.80K to 1.2K Ohms (800 to 1200 Ohms). Replace if outside this range.

4. 4

   Perform a harness short-to-ground test: with sensor and TCM disconnected, test the signal wire between the sensor connector and the TCM connector for continuity to ensure the wire is not broken. Then, check the signal wire for continuity to a known good chassis ground. Infinite resistance is expected; continuity confirms a short in the harness.

1. 1

   Prepare machine

   Park the tractor on a level surface, engage the parking brake, turn off the ignition, and disconnect the battery ground cable.

2. 2

   Locate and access sensor

   Locate the transmission output speed sensor on the transmission housing. Remove any access panels or components (like the air cleaner housing) if necessary for clear access.

3. 3

   Clean area and remove sensor

   Thoroughly clean the area around the sensor. Disconnect the electrical connector, remove the securing bolt or nut, and gently twist and pull the sensor to remove it. Be prepared for minor fluid loss.

4. 4

   Install new sensor

   Lubricate the new sensor's O-ring with clean transmission fluid. Insert and rotate the sensor until seated, then tighten the retaining bolt to the manufacturer's specified torque (e.g., 5.5 Nm). Do not overtighten.

5. 5

   Reassemble and test

   Reconnect the electrical connector, reinstall any removed access components, and reconnect the battery. Start the tractor, clear the fault code, and test drive to verify normal transmission shifting.