John Deere 000084.14 – PTP / SCC: Wheel Speed Sensor Voltage Out of Range

The control module has detected an abnormal voltage level in the Vehicle Speed Sensor (VSS) circuit, indicating a Hall effect VSS supply voltage out of range, or a missing wheel speed sensor on the CAN bus. This communication loss or voltage irregularity can cause erratic speedometer readings, malfunctioning cruise control, transmission shifting issues, and may force the vehicle into a restricted limp mode.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7R 210
• 7R 230
• 7R 250
• 7R 270
• 7R 290
• 7R 310
• 7R 330
• 7R 350
• 8R 230
• 8R 250
• 8R 280
• 8R 310
• 8R 340
• 8R 370
• 8R 410
• 9360R
• 9370R
• 9410R
• 9420R
• 6M Series
• 5M Series
• 6D Series

1. 1

   Carefully inspect the wheel speed sensor, its connector, and the wiring harness for any signs of physical damage, corrosion, or loose connections. Poor crimps or damaged wires can cause resistance and voltage drops.

2. 2

   If other codes are present, such as those related to battery voltage (SPN 168) or CAN bus errors (SPN 625/FMI 9), they should be addressed first.

3. 3

   For active sensors, which require power from the vehicle, test the vehicle-side harness for the correct power supply and ground with the connector unplugged and the ignition in the appropriate position. Some systems use a 5-volt supply, while others may use the battery's voltage.

4. 4

   If the sensor is a two-wire passive type, its internal resistance can be checked using a multimeter set to Ohms. Disconnect the sensor and measure the resistance across its terminals. A reading outside the manufacturer's specified range (a common range is 800-2000 ohms) may indicate a faulty sensor. An open line (OL) or a reading near zero suggests an internal fault. Note: Do not perform a resistance test on an active (three-wire) sensor, as it can give misleading results.

5. 5

   With the sensor still disconnected, set a multimeter to AC volts and connect the probes to the sensor's terminals. Spin the wheel by hand; a healthy passive sensor should generate a small AC voltage that increases with wheel speed.

6. 6

   Using an oscilloscope is the most reliable way to check the signal output of an active sensor to confirm proper operation.

1. 1

   Repair Wiring and Connectors

   If the diagnostic checks reveal damaged wiring or corroded connectors, repair or replace these components first. Ensure all connections are clean and secure.

2. 2

   Replace the Wheel Speed Sensor

   If the sensor is identified as the faulty component, it will need to be replaced. The sensor is typically located at the wheel hub.

3. 3

   Calibrate

   After replacement, some systems may require calibration, which can sometimes be done through the tractor's display by driving a known distance. For PowerShift transmissions, calibration procedures may be necessary after certain repairs.