Two problems related to automatic transmission control module have been reported for the 2003 Chevrolet Suburban. The most recently reported issues are listed below.
2003 Chevrolet Suburban with traction control. Control cuts in when making sharp turn from side road onto main highway. This causes vehicle to rapidly slow to almost a stop until transmission catches up and vehicle speed increases. Dealer says it is because of sensors in wheelbearing and the wheelbearings need to be replaced. This is a definite hazard when entering a high speed (55 mph or higher) highway from a side road. I complained to gm and they said there were no recalls about this. Dealer says they have had problem on several vehicles.
Check engine light illuminated after 300 miles travel. Hard shift from first to second (felt like transmission dropped from vehicle. This first occurred six months after purchase of 2003 Chevrolet Suburban (new). Dealer re-programmed transmission control module. Same problem on return trip four days later, and six more times in the past 2 1/2 years. Four separate gm dealers, in two states, have attempted fix via: 1. Re-program tcm, 2. Replace transmission solenoid, 3. Replace transmission valve body and re-program tcm. Still not fixed.