2004 ABS, Advance Trac Problems

[ExpedFord]

Hello!

Just wondering if anyone might know what may cause my Advacne Trac, ABS, Auto 4WD, & auto doorlocks to malfunction?

I suspect a speed sensor, but don't know how to find out which one(s)?

Thank you!

2004 Ford Expedition 5.4lt

 

[tonydiv]

Easiest thing to do is to clean them all with brake cleaner and a rag. Check the tone wheels (those gear-y looking things on the front axle shafts) too.

I would also feel the front carpet and make sure that there isn't a windshield leak. Water getting in to the GEM module can also make wacky things happen.

 

[ExpedFord]

Wow! Thanks Tony.

Is the GEM on the passenger side?

I found a wet carpet on the pass side when I cleaned the matt the other day.