One problem related to service engine light on has been reported for the 2003 GMC Envoy. The most recently reported issues are listed below.
The contact owns a 2003 GMC Envoy. While operating the vehicle, the service engine light illuminated. While in four wheel drive mode, the vehicle would not accelerate. The vehicle was taken to the dealer where it was diagnosed that the icv was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 150,000.