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Engin power reduced

RONALDFS

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Joined
Jan 17, 2003
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Location
SPRINGFIELD,MA
my sis has a 2008 ltz which is getting a engin power reduce. code that comes up is the PO641. Once the cam shaft sensor error came up and they replaced the cam sensor and it ran fine for several hours.
now the PO641 code comes uo and they get the engin power reduce, stableltrack goes off, traction control goes off. its not shooting any other codes.

any help will be thankfull,

Ron
 
Last time mine did that it was a poor connection at the throttle body.

I cleaned the connectors, reseated and have not had a problem since.
 
Hey Ron your sis may want to take the 08 to a auto parts store that has a little better code reader.

If you have all those warnings she has to have a bunch of codes that her reader can't read.
 
The PCM puts out a 5v reference signal that goes to multiple modules.  You've most likely got a short circuit somewhere or need to replace the PCM.
 
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