* Inaccurate or non-functional speedometer: This is the most obvious symptom. The needle might stay at zero, jump erratically, or show an incorrect speed.
* Transmission problems: The transmission relies on the VSS signal to shift gears correctly. A faulty sensor can lead to rough shifting, delayed shifting, inability to shift into certain gears, or even the transmission going into limp mode (reduced power and limited shifting).
* Cruise control malfunction: Cruise control often relies on the VSS signal to maintain speed. A faulty sensor will likely disable the cruise control.
* ABS (Anti-lock Braking System) problems: The ABS system also uses speed sensor input from the wheels. A faulty VSS might trigger an ABS warning light and reduce the effectiveness of the ABS.
* Check Engine Light: The malfunctioning sensor will almost certainly trigger the check engine light to illuminate, storing a diagnostic trouble code (DTC) that can be read by an OBD-II scanner. This code will help pinpoint the specific sensor at fault.
* Odometer malfunction: The odometer might stop working or record inaccurate mileage.
It's crucial to diagnose and repair a faulty speed sensor promptly. Driving with a malfunctioning VSS can lead to unsafe driving conditions, particularly concerning transmission and ABS functionality. A mechanic can use a scanner to identify the faulty sensor and replace it. It's important to use the correct replacement part for your specific vehicle.
