Originally Posted by Bama Rambler
According to the owners manual, the Wrench icon;
Illuminates when the system has detected a powertrain or an all-wheel drive fault.
It's possible that the prodigy backfeeding power into the brake switch circuit makes the computer think there's a problem.
Answer Mike's questions and we can possibly help more.
The neat thing about the wrench icon is that you can use good
OBD II to tell you exactly
what's wrong. Everybody knows that you can use a cheap OBD II scanner to get the "P" (Powertrain codes). Most people don't know that if you get/borrow a real
OBD II scanner, you can also get the "Body" (B) and "Chassis" (C) codes. I've been tempted to write a free app for Android to do this, but it's way down on my list of priorities.
When the wrench is displayed, if you scan the car with a real OBD II scanner, you can find out what the car is unhappy with. The dealer will probably nick you $75 to do this. The local electrical/electronic specialist, Auto-Tek, will not only do it for free, but they won't let me pay them or tip them, either. The last time I went there, it was a problem with Auto-Level on the GMC TV. I just wanted a hint of where to look. Their guy spent about two minutes and said "C5990, right rear air shock." I crawled underneath (right on the spot) and sure enough, the plastic clip holding the air hose was gone and the hose had popped off.
The reason it took two minutes was that he first said "There are no Body codes set." I said "It's a Chassis code, I think." Then he scanned for the C codes and there it was.