Greetings. I couldn't find this topic - maybe I missed it. But I have a 2002 Grand Prix SE and have ABS light on, TRAC light on. I need some suggestions on how to troubleshoot. What is happening is when I start the car, the lights are OFF. After driving a little bit, they come on. Sometimes after a few feet of travel, or can be a mile or so. Sometimes after pressing the brake pedal, sometimes not. The code I get is p0045(circuit malfunction). I have checked the sensor with an ohm meter - 1.082kohms. I have this reading all the way back to the main connector on the ABS module(pins 22 and 23), so I believe the wiring harness is good. I checked the millivolt signal at the main ABS connector with the car on a jack, and spinning the tire - 100 to 400 mv depending on tire speed. Was thinking the ABS module could be bad. With winter coming, I would like to get this fixed.
Any suggestions?
Bryan
