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Service engine soon light on 1999 gmc sierra 5.3 ltr engine. What causes it?
Wiki User
∙ 13y ago
The service engine soon light comes on when there is a problem with the engine or transmission. They are both monitored and controlled by a computer. You will need to take the car to a shop or AutoZone can read the codes for free. This will at least tell you what area is setting the light.
Wiki User
∙ 13y ago
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