P1818 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 11-28-2016, 01:17 PM Thread Starter
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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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post #2 of 4 (permalink) Old 11-28-2016, 02:34 PM
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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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post #3 of 4 (permalink) Old 11-28-2016, 02:59 PM Thread Starter
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I did have a coolant leak around the connector piece. Going to check the transmission now. Thanks
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post #4 of 4 (permalink) Old 12-03-2016, 11:15 AM Thread Starter
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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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