Lights on dash

JOE THE MARINE

MEMBER
2002 CHEVROLET BLAZER
4.3L
V6
4WD
AUTOMATIC
173,000 MILES

Every once in awile, my ABS and BRAKE Light goes on and if I stop and shut the car off, and turn it back on, its off. This happens sometimes if I am driving short distances and 10-15 miles. I HAD THE BRAKES DONE not to long ago and checked and they are in good shape to pass inspection, The fluid is filled to max. Cant figyre out what it could be, can you help, tks.

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,244 POSTS

Welcome to 2CarPros.

Chances are you have a wheel speed sensor that is failing. These sensors are on each front wheels and the rear wheel speed sensors are controlled by the vehicle speed sensor.. If one is failing, it will turn on the ABS and brake lights.

Now, the tough thing here is they can be checked without any high priced scanner, but since it is intermittent, that will make it difficult. The right scan tool will tell you which wheel is causing the problem.

What I am going to provide are directions explaining how to check a wheel speed sensor, the locations of the sensors, and directions on using the basic tooling needed to check. Take a look through this link:

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

Here is a link that shows in general how one is replaced:

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

On your vehicle, the front speed sensors are part of the hub assembly. I attached a pic and highlighted the connector. If you can, check the fronts and let me know what you find.

Take care,
Joe

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