First off, I need to say "Thanks" to Jesterville for getting this thread going. Next I want to share with those who find this thread what I went through to get this problem fixed. I even took photos That may help someone down the line. First off the "official" name of this part is Battery Current Sensor. (BCS) I did some research. GM made two different versions. A 5v version and a 10V version. You can turn the car on and put a meter across the middle and red wire to determine which voltage your car takes. This can be done with the connector unplugged. Rumor has it the voltage difference is based on the options your car has. The part number is: 13505369 for the 10v version. (What my GXP takes.) I looked at mine with Jesterville's photo in my head and guess what? Same damage. Same thing! Here is a photo of my Battery Current Sensor. 2007 GXP 2a.jpg
My next stop is a auto parts store. They have never heard of a BCS. I take them out to my car and show them. Still never heard of it and nothing, no part is listed on their computer. I next go to a brake specialist, (Ryhmes with "Makes-Fuss") and show them. They too have never seen this part or heard of it. Funny since this part caused my brake lights to fail, Traction control to fail, ABS to fail, and my Stabiltrak all to fail. Which left me forced to go to my local GM dealership. I pull into the service center and show them what I think my (and Jesterville's issue) is. They look at me like I am stupid and said THEY would take a look and TELL me what the problem is. Not the Grand Prix forums! An hour later they came back with the brake pedal switch failure theory and a $222 estimate! Of course I said "Gimme my car back." More research to be done. I found that the 10volts comes from the Brake Control Module. Which is why it would cause all these brake issues. I then disconnected the BCS and guess what? All my error messages went away and my brake lights came on. I then called the GM parts dept locally and spoke with the parts MGR. He had never heard of this part I was describing to him. But he did find it on his computer. I told him I needed the 10v version. Luckily he had that one in stock, sitting on his shelf. Only $21, All this hassle over $21? Here is the photo of the bag it came in. Part Bag1a.jpg Here is a photo of the new part. New Part a.jpg Problem Fixed! Thank You Jesterville, Thank You Grand Prix forums.
