🐖 Vehicle Speed Sensor Problems

The P0502 stands for “Vehicle Speed Sensor A Low Input.” It’s logged when the PCM detects a low input voltage signal from VSS A. Some problems that could trigger the code include a faulty VSS, metal debris buildup on the speed sensor, and wiring harness issues. When you have a faulty speed sensor, you will often see the P0500 trouble code. The speed sensor is used not only to control the speedometer, but also to control the cruise control system and it may be used to control the way the engine runs. If the indicator light on your engine is on, you can check the trouble code with a scanner. 3. Anti Lock Brakes Stop Working. The system that is most affected by a bad wheel speed sensor is your vehicle’s anti-lock braking system. If your ABS stops working properly, it can cause your brakes to lock up or skid. This can obviously be very dangerous, so getting the problem fixed as soon as possible is important. Will a wheel speed sensor cause brake problems? Of course, a bad wheel speed sensor can result in brake issues. However, the problem does not usually span across to the regular brake system in the vehicle. The problem often affects the anti-lock brakes. A defective wheel speed sensor will affect a car’s anti-lock brakes and make it malfunction. The Vehicle Speed Sensor produces 8 pulse per rotation which a stock computer assumes 8000 pulses per mile. The Vehicle Speed Sensor (VSS) is a variable reluctance sensor that generates a waveform with a frequency that is proportional to vehicle road speed. When the vehicle is moving slowly, the sensor produces a low frequency signal. As the Subaru Legacy owners have reported 2 problems related to speed sensor (under the vehicle speed control category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Subaru Legacy based on all problems reported for the Legacy. A bad speed sensor can affect the speedometer. The erratic or inaccurate speedometer reading is one of the common signs of a bad speed sensor. If the reading of your speedometer is constantly going up and down, then there is a chance of a failed vehicle speed sensor. Your vehicle will continue to run without a working speedometer. However, some vehicle speed sensor locations may differ from others; hence, the need to check your vehicle’s manufacturer’s manual to be sure. 3. Unplug The Wires And Remove The Sensor. Use a pair of pliers or screwdrivers to unplug the black and white wires from the wheel speed sensor and remove it. More About Input Speed Sensors. Located on or inside your vehicle’s transmission, the turbine speed sensor measures the RPM of the turbine shaft. Once the PCM or TCM detects an irregularity in the turbine speed input, it will trigger the illumination of the Check Engine Light. IITV.

vehicle speed sensor problems