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P1518 Code


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I have a 2003 Sierra 2WD with a 4.8. Yesterday on the highway aduring a 45 minute run I got an engine light along with traction control light and reduced power message. I was able to get it home with out shutting things down. When I got home I scanned it and got P1518 code. I shut the engine off and started up a again and the power was normal only the engine light was on. Looking at posts regarding this code. Can anyone tell me were these ground locations are and what they look like. G104 and G103. I can't seem to find them behind along the firewall.

 

Thanks in adveance and if anyone else has any suggestions.

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