I had this same problem on my 2006 Uplander. We had it in several times and the technicians could not replicate the problem. Unfortunately my problem was not continuous but would occur every time I turned Left. They were telling me the sensors were defective. The last time I took it to them I asked to check the ABS thouroughly. Turns out they found the wiring harness had been nicked and was causing intermittent faults in the ABS circuit.
I had the master cylinder replaced a few months ago and the light hasn't come on since. It was under warranty.
Have vehicle scanned to determine the problem
The computer has detected a problem with the emissions system.
There is a sensor in the side of the radiator that is most likely defective.
Brake lights? Check brake light switch for adjustment or replacement
try replacing brake light switch sounds like you have a short in it
You have a problem with the SRS. Due to the danger with working on the SRS, this is not a DIY repair. Seek out a professional for this repair.
Stay with Me - 2005 was released on: USA: December 2005
If the trunk lid isn't actually ajar, the switch has gone out of alignment, or it broke.
Have you checked the spare tire yet? I hear that if the spare is too low the light will stay on.
The brake light switch is under the dash, and whenever the brake pedal is touched the brake light comes on. If the switch has failed or is out of adjustment it will leave the brake light on.
The computer has detected a malfunction. You need to have it checked for codes. You can then diagnose the code.
untill they are repaired