This procedure covers the replacement of the vehicle speed sensor (VSS) on the transmission, as 2014 Ram 2500 vehicles use electronic speed sensors rather than traditional speedometer cables.

Warnings

Tools required

Parts

• Vehicle Speed Sensor (VSS) × 1 — Use OEM Mopar specification
• O-ring seal for VSS × 1 — Often included with sensor

Fluids

• Mopar ATF+4 — 1 qt

Preparation

1. Park vehicle on level ground and apply parking brake
2. Place wheel chocks behind rear wheels
3. Allow transmission to cool if vehicle was recently driven
4. Raise front of vehicle using floor jack and support securely on jack stands
5. Locate the Vehicle Speed Sensor on the driver's side of the transmission case, near the output shaft
6. Clean area around sensor to prevent debris from entering transmission

Procedure

1. 1

   Access the Vehicle Speed Sensor
   Position yourself under the vehicle with adequate lighting. Locate the VSS on the driver's side of the 68RFE transmission case, near the output shaft housing. The sensor will have an electrical connector attached. Clean the surrounding area with a wire brush and shop rag to remove any dirt or debris.
2. 2

   Disconnect the electrical connector
   Press the locking tab on the VSS electrical connector and carefully pull the connector straight off the sensor. Inspect the connector terminals for corrosion or damage. If corrosion is present, clean with electrical contact cleaner.
3. 3

   Prepare for fluid loss
   Position a drain pan directly beneath the VSS location. Be prepared for approximately 0.5-1.0 quart of ATF+4 transmission fluid to drain when the sensor is removed. This is normal and expected.
4. 4

   Remove the Vehicle Speed Sensor
   Using the appropriate socket, remove the VSS mounting bolt. Carefully twist and pull the sensor straight out of the transmission case. Allow fluid to drain into the pan. Remove and discard the old O-ring seal from the sensor bore.
5. 5

   Inspect the sensor bore
   Wipe the sensor bore opening clean with a shop rag. Inspect for metal shavings or debris, which could indicate internal transmission issues. The bore should be clean and smooth. Use a clean rag to temporarily plug the opening and prevent further fluid loss.
6. 6

   Prepare the new sensor
   Remove the new VSS from packaging and verify it matches the old sensor. Install the new O-ring seal onto the sensor body. Lightly lubricate the O-ring with clean ATF+4 to ease installation and prevent damage during insertion.
7. 7

   Install the new Vehicle Speed Sensor
   Remove the temporary plug from the transmission bore. Carefully insert the new VSS straight into the bore, ensuring the O-ring does not twist or roll. Push the sensor fully into position until it seats completely against the transmission case.
   Torque spec

   Mounting Bolts46 Nm (34 lb-ft)
8. 8

   Reconnect the electrical connector
   Push the electrical connector onto the new VSS until you hear and feel a positive click, indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked in place.
9. 9

   Check and top off transmission fluid
   Lower the vehicle to level ground. Start the engine and allow it to reach normal operating temperature. With the engine running and transmission in Park, check the transmission fluid level using the dipstick. Add ATF+4 as needed to bring the level to the proper HOT range on the dipstick. Typically 0.5-1.0 quart will be needed to replace what was lost.

Reassembly

1. Ensure electrical connector is fully locked onto VSS
2. Verify no transmission fluid leaks are present around sensor after installation
3. Clean up any spilled transmission fluid from undercarriage
4. Remove jack stands and lower vehicle completely

Verification

• Start the engine and verify no transmission fluid leaks around the VSS
• Using a scan tool, verify the VSS is providing speed signal to the PCM (should show 0 mph with vehicle stationary)
• Test drive the vehicle and confirm speedometer operates correctly at all speeds
• Verify the odometer is incrementing properly during test drive
• Check for any speedometer-related diagnostic trouble codes
• Recheck transmission fluid level after test drive and top off if necessary

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