Reading through posts I have determined I have a bad TCCM. My question is if that could cause my ABS module to cycle all the time? The only way I can get it to stop cycling is if I either disconnect the battery or unplug the main connector from the ABS module. I am leaning towards a bad abs module and a bad tccm, but with both going out at the same time it has me wondering. Thanks for any help!

 

sounds like abs module or one of the speed sensors in the rear diff or the wheel bearings are giving the wrong speed or an intermittent signal. at least thats what is going with my abs do your abs and brake lights come on when they do your abs module shuts down

 

Here are my symptoms:

ABS is constantly cycling unless battery is disconnected or main plug from abs module is disconnected

4x4 shift **** has no lights on and truck will not shift to four wheel drive, doesnt matter if abs module is plugged in or not.

My main question is if the tccm and abs module communicate to each other or if they are completely seperate. If they are seperate, that would mean I have a bad abs module and a bad tccm, but if they communicate one could be causing both problems. Thanks for any help or thoughts.

 

i have a dumb question, did you check the fuses for the 4x4 and the abs?

 

Yep, all fuses are good.