One problem related to starter has been reported for the 2003 Chevrolet Blazer. The most recently reported issues are listed below.
Vehicle stalled while driving, but will restart when key was turned in the ignition. Vehicle was serviced 5 times in which a diagnostic test was performed, no failure code found. Then, dealership removed the automatic starter system, and the vehicle only stalled once. A year later, the service engine light came on while driving. Dealership replaced the computer chip, but the light came back on.