Okay haven't posted in probably a year but I'm having the same issue I did a year ago and I need to fix this soon since I'm trying to sell the sunfire. I've got an 03' sunfire and last winter and again this winter the abs and e-brake light come on when it's cold. Anything below about 10 degrees Celcius the lights are on, when the weather warms up they don't come on. Someone had mentioned maybe they are holding mosture, but if I take the car to the car wash when I get back in the car because it warmed up in the car wash the lights are out. I've checked all the wires, made sure brake fluid is full, cleaned up all the connections and put di-electric grease on them just to make sure it's not a moisture issue. I've had it scanned for abs codes and it's not bringing up a wheel speed sensor code at all so I'm lost at what to do now. Any ideas? I mean I guess in a month or so the weather will be good and the lights will be out and I can sell the car, but I'd rather fix the issue. If I slam on the brakes the abs is functional on all 4 tires (checked it in an alley) Any help apprecited, thanks.
I'm thinking its time to bring it to a shop.
Check your brake light bulbs and your hazard switch
Well I have an update, after taking a heater to all the sensors and not finding one of them to be a problem. I looked at the brake pressure modulator and thought I wonder if I put some heat to that if that would make the light go out, sure enough heating it up made the abs light go out. Any ideas on what would make the bpmv sensitive to the cold?
And as for taking it to a shop, I work at a chevy dealer and I know what goes on in the back. It's the last place I'd take my car, and after asking some techs about the abs problem their solution was to replace all the speed sensors rear hubs and all. ummm yea typical shop solution "just replace parts until one of them turns out to be the right one duh" And now after figuring out it's not a sensor I'm glad I didn't follow their numpty idea and waste a lot of money.
sounds like your chevy dealership blows...
most shops would accurately diag your problem before replacing parts
Speedline02 (GME Chat!!) wrote:sounds like your chevy dealership blows...
most shops would accurately diag your problem before replacing parts
Replace most with many and I'll agree.
I've worked in a couple mechanic shops and a ford dealer and never really seen anything but replace parts and hope for the best. Unless the problem is obvious or the diagnosis can be found by plugging it in to a computer it seems even the most experienced journeymen are at a loss. It drives me nuts. A good friend of mine is a 3rd year and when it comes to by the book problems he's great, but if it's an odd or out of the ordinary problem he has no idea what to do other than start replacing the cheap parts and work your way up. But now I've figured out the problem and just can't find the cause, why would the pressure control be sensitive to the cold?
just a thought, could moisture contamination cause this? I don't see why there would be moisture in it but it's possible and it could be causing the cold sensitivity. any thoughts?
If there is a broken part it can be diagnosed and it can be fixed, simple as that. I think im gonna make a post about how a shop is supposed to handle your car
