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I have a 2007 cobalt with a 2.2l. The car drove fine one day and the next day it’s throwing the U0101 code. Power steering light flashing, traction control light is on, car will not shift, and the speedo does not work. J have recently replaced the Tcm with a new one and had it programmed to the vehicle but still did not resolved the problem. Anybody have any ideas???
 

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Yeah, try re-seating the 2 blue/gray connectors on the BCM. If it works for you then add dielectric grease to prevent this from happening again.
 
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