Corrosion at the fuel tank to body harness may cause the Check Engine Light to illuminate or a crank no start condition. This corrosion issue is most commonly caused by a water leak inside the vehicle. Any damaged wiring or connectors will require replacement.
Corrosion of the Fuel Tank Harness Due to Water Leak on Buick Terraza
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Check engine light came on. Was repaired by replacing the harness for EVAP system and fuel system. Also connection in floor.