99 silverado z71. i have both of these codes which are..
C0237 Speed sensor erratic, rear
C0238 Stop lamp switch circuit

abs light comes on at different times....normally above 30 or so...but really all over the place. sometimes just flashes on then off...others, comes on and stays for longer... bumps seem to trigger as well as hitting brakes.....

i have noticed the red brake light flash on before as well......

any ideas?

 

about 2ys ago GM had a recall on the ABS sensors in the front end of these trucks. The sensors fail and can cause brake failure to the point that you dont stop when needed.

 

Battery, heater core, and now this?

 

have to know that the truck is driven very little...so everytime i drive, i have been finding something...just now posting up with all info gained so far...i know it looks like alot all at once...that is why though

 

I have something that will fix all your problems.. j/k

 

feel that way sometimes..prob 4 out of the list right off the bat..haha

 

i still need some help on what to do here guys?

 

the sensor in the t-case is prolly going out, and as for the stop lamp code, you can ignore that, i see it in a number of trucka for no reason @ all.....mine included.