Mechanics

SATURN L300 SENSOR PROBLEM

2002 Saturn L300 • 71,500 miles

2002 Saturn L300 w/approx 71500 miles.
Service Engine Soon light is on (not the wrench light) - no fault codes show up on the tester
ABS light is on w/fault code P0500 for wheel speed sensor. Wheel sensor was replaced but did not correct the fault. (Dealer says it's the BCM)
Cruise control inop (fuses are OK)
Odometer lighting has failed.
All of this happened about the same time.

Can all of these items be due to a bad BCM?
Thanks.
Avatar
Larryol
October 16, 2012.



You need to stick to one question and not keep starting a new one to post replies if you do it makes it so much harder to help you. Lets stick with this question post your replies here. So far it doesnt seem like a bad body control module I have replaced tons of them when I worked at the saturn dealers.I will back on here later have a few things to take care of.


Saturntech9
Oct 16, 2012.
Some additional information. P0500 also lists "vehicle speed sensor A". This sensor was replaced by the Chevy dealer a month ago but did not not resolve the ABS light. They said the next thing was the BCM. My biggest concern is the recurring SES light that does not throw a code and even after reset it comes back on within 20 minutes. Engine has had a tune up (plugs, fuel injector cleaning (replaced one of them)) and seems to run fine.


Tiny
Larryol
Oct 16, 2012.
Here is the trouble tree for the code P0500 it doesnt say anything about the speed sensor or bcm does it?ALso what kind of scan tool are you using when you cant find any codes when the check engine light comes on?


Saturntech9
Oct 17, 2012.
The scan tool I am using is a Craftsman 87702. The Chevy dealer's scan tool also shows no fault code for the SES light. That's why they don't know what to do about the problem.
If neither scan tool shows a fault code, what else could cause the fault?

Regarding the P0500 code, the tool shows a speed of zero mph. I will try the procedure you provided.

As for the cruise control, I related it to the BCM because they both tie into the same under hood fuse.


Tiny
Larryol
Oct 17, 2012.
New information. I went back to look at the service records. What the dealer replaced was the right rear wheel speed sensor cable assembly. As stated before, this did not correct the ABS light. They then stated in the repair order that the wheel sensor was not communicating with the EBCM and it needed to be replaced. Is your previous advise still valid?
Thanks.


Tiny
Larryol
Oct 17, 2012.
For the code P0500 it still applies because it has nothing to do with the right rear wheel spped sensor see what you can find.


Saturntech9
Oct 18, 2012.