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Discussion Starter #1
Hey everyone! New here. 06 cobalt LS 2.2L getting a reduced eng pwr and it came up code P1818 - TFP valve position switch indicates drive without drive ratio.

Not sure what that means or how I can fix it. Google isn't giving me much info. Any help?
 

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Chances are you are low on transmission fluid, top up and check for leaking cooling lines going to radiator.
 

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Transmission fluid level was good but I added some more fluid. Still coming up eng pwr reduced sporadically.
 
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