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I have 2010 Malibu with 86k miles. The Service traction warning and ESC off light started coming on about a week ago. After a while the check engine light comes on with P0301 and P0201 codes.

Took to local dealer and they only performed the recall 13036 Brake Lamp Malfunction recall and said they did not see any codes in the system after 3 days. Picked up car and within a few minutes, the same warnings occurred.

Dealer took another look and now have all the same codes as I told them on day one. They told me it was a bad injector wiring harness that needs replacement @ $280 and that anytime the service engine light comes on the Traction and ESC go off.

Wondering if anyone else has seen the same and this is anything related to the injector harness.
 

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I have a 2011 with 3.6L V6.

I get the Service Traction warning and ESC Off message and never get them together with a CEL. I can almost 100% of the time generate the 2 messages by simply turning the steering wheel. A year ago I replaced the front wheel bearings believing that it might be the VSS (veh speed sensors) that also serve as the ABS sensors. Nope.

The 2 codes you got might be why they recommend the injector harness service. Is yours a 4-cylinder engine? If so, there have been TSBs about the harness near the coil packs needing to be moved and/or shielded plus a ground wire added for the coil packs. What happens is the EPS (electronic power steering) draws so much power that it causes the alternator to charge very strongly. The power passes by the coils and can induce a current in them, causing a misfire. Also, they can misfire and cause an induced current in the EPS that makes it twitch or do other funny stuff. My V6 has hydraulic PS so it doesn't have this issue.

Get them to provide more information on why they recommend the service. You, after all, are the one who is in control of your wallet. Don't go easily into the dark night of misguided advice on services that aren't needed or are completely wrong.
yes a 4 cyl, thanks for the info
 
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