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changed PCM now fuel gauge reads empty

S

seriousnuke72

New member
Changed my PCM. and now it wont start and the low fuel light comes on and fuel gauge reads empty. I put the old one back in and it registers fuel and starts. Need help ASAP thanks.
 


Its a 99 grand prix gt and the new PCM is out of a 2000 Buick I got female the salvage yard. Numbers match but I wondered if the Buick being in an accident for some reason the fuel has been shut down?
 
Wait, why would you swap out a pcm from a Buick, was yours broken or what?

Hopefully someone else will chime in but I dont know about transplanting a pcm from a completely different vehicle... I know it could be the same motor but different security systems and fuel pumps/fuel delivery, electrical systems, etc
 


I hope that PCM was tuned or something...other then that why would u swap it ?

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