My ABS light stays on. I have had the modgulater and also replaced the secondbox pertaining to the brakes and the light is still on. this is on a 2001 Chevy , Class B motor home. We have less than 45,000 miles on it and this has just started. So far we have spent over 900 dollars on it and so far nothing. Please help. Thank you, Pat Graham
1st of all, what modulator? The EBCM? & what 2nd box? There is only 1 control module for the ABS system. The wheel speed sensors are the best starting point. The recall was only opened on Silverados, Tahoes, & Suburbans & only in certain rust belt states. You may not need to replace them. Cleaning them works sometimes. When the previous repair was performed, was the light cleared? If it wasn't, then I would go & have that done. ANYTIME that your ABS warning lamp is illuminated (regardless of the light's color) your ABS system will not activate.
You did not indicate the color of the light,if it is orange it is more likely that it is a wheel sensor or wiring,if it is red then it is likely to be the ABS control unit,also make sure the master cylinder is full it will also turn the light on.The brakes will work just like normal brakes in the case of total failure of the ABS,you will still have power assist just not ABS
The 1999 through 2003 Chevy P/U had a problem with faulty wheel sensors and ABS modules that go bad. I am not sure if this affects your modle but you could ask to see the bulletins on those models. Or you could do a google search but you will get many responces. Gm seems to have a problem with this across the board.
Most of the time the problem is with the sensor simply because it is the most vulnerable. One of the common and quickly fixed problems with GM truck is corosion under the sensor pushing it up enough to lose the reading from the hub. If this is the culprit it can be fixed by carefully removing the sensor, plugging the hole with something that will GAURANTEE no dirt or rust gets into the sensor hole and cleaning the rust from around the area. DO NOT GRIND the metal down as you have only a milimeter or so room for error hence the ability of rust to puch your sensor up enough to trip the code. I have done this on several 1/2 and 3/4 ton GMs with no problems. If it is not this then check the wheel bearings. This is another part that will cause the same issue. What side is tripping the code? That's where to start. 45K is not alot of miles for a wheel bearing but my step-daughter and I both have had our new GMs in for wheel bearings with less than 30k. They truly don't make 'em like they used to. Best of luck Pat.
The first thing to check is the fuse box. The ABS system has a fuse inside the fuse box. I think it's a small amp fuse that blows very easily. Check it out. Many times, especially in rigs like Motorhomes they tap a hot wire and add something extra to the system. Another thing that I've seen happen is that it's easy to blow an ABS fuse if you don't have a trailer or tow vehicle wiring hooked up properly. If you tow with it my bet is that's your problem.
