Fixing a Jeep ABS / Traction Control / ESP BAS Light - Time for a Wheel Speed Sensor - Fault C100A

The Jeep decided that it needed some attention and turned on 4 warning indicators - Traction Control, ABS, ESP BAS, and the Service 4WD System message! Also, it won't let me turn on cruise control! That is a pretty big list of faults. Time to find out why! Follow along as I show how to fix this issue.

This particular Jeep is a 2006 Grand Cherokee Limited with the 5.7 Liter V8, but it also works on the V6 model and many other years. You may need a different wheel speed sensor than the one I show here, but call your local car parts store and they can help you get the correct part.

To diagnose this problem, I am using the "AlfaOBD" app paired with my OBDLink MX+ reader. You can find the "AlfaOBD" app in the play store (only available for android at this time), and you can find the OBDLink MX+ on Amazon.

The AlfaOBD app indicuated a fault C100A which is a faulty left front wheel sensor. Since it did all the hard work of figuring out which sensor is bad for me, let's get a new one and get it installed!

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Reference:
ABS - Antilock Braking System
ESP - Electronic Stability Program
BAS - Brake Assist System

Note - your vehicle should only be serviced by a licensed repair facility or by the dealership.