Q: Break light and abs light on

asked by on January 26, 2017

My car starated running like crap the break light and the abs light come on and it will hesitate to go most the time won't go backwards when in reverse and the speedometers not working

My car has 143000 miles.

Hi There, It sounds like you may have two separate issues going on here. The ABS control module controls the activation of the ABS system based upon inputs from the ABS wheel sensors. When this module is not working properly you may notice it inadvertently activating the ABS system causing the brakes to lock up randomly or simply causing the ABS light to come on. In some cases it may not activate the system at all and may be related to inaccurate input data from the wheel sensors.

The speedometer and reverse problem may suggest a failing speed sensor. The transmission speed sensor is a magnetic sensor that provides this information, allowing the transmission to shift smoothly. The sensor counts the internal number of revolutions of the transmission and transmits that information to the transmission control unit, where the data is used to determine the rotational speed. As the rotation increases, the control unit directs the changing of gears. When this is not working properly, this may cause the transmission to shift erratically or in some cases not at all. I would recommend having an expert from YourMechanic come to your location to take the car for a test drive to more specifically determine the cause for this.

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