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[pamalaf1]

My name is pam I drive a 99 Silverado 1500 4x4 with a 3 inch lift kit I'm having a problem I can't figure out my code reader gives me code co237 its not a code that has a description so I called gm dealer told me it was speed sensor so I replaced all 3 of them still having same problem cruise control doesn't work right ill be driving highway speeds and my speedo goes crazy and abs light is on and brake light flashing and all of a sudden my truck kicks into passing gear no reason it should have can u please help

[Green 1364]

What speed sensors did you replace? I replaced mine on my 2002 Silverado and even though they were new I had to have them calibrated.

[Brandons72vette]

Welcome Pam!

[99silveradoz71]

Welcome aboard.

[pamalaf1]

What speed sensors did you replace? I replaced mine on my 2002 Silverado and even though they were new I had to have them calibrated.

[pamalaf1]

I replaced the 2 connected to the front wheels and the one to the transmission

[Green 1364]

I replaced the 2 connected to the front wheels and the one to the transmission

The two on the front wheels do have to be calibrated. Mine went and anything below 11 MPH your truck will not stop, happened to me. Replaced mine and dealer told me they calibrate them or they don't work.

[Brandons72vette]

Welcome !