Having problems with your 2003 Hummer H2 ?
Reduced engine power, warning displayed in panel. No acceleration
Hummer H2 ,2003- 4.3 vortex.
Tried disconnecting battery to reset, failed.
Needs to be put on computer to read codes to see whats going on.Could be one of many things going on there.
Repair Help & Product Troubleshooting for 2003 Hummer H2
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