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Idling and Shifting Problems after Check Engine Light "Fixed" at Dealership


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TotalNoob
New User

Aug 31, 2014, 8:41 AM

Post #1 of 3 (848 views)
Idling and Shifting Problems after Check Engine Light "Fixed" at Dealership Sign In

2010
Chevrolet
Cobalt LT
2.2L 4cyl 5M
~52,500 miles

About 2 weeks ago, the check engine light came on. Auto Zone told me it was either MAP sensor or vacuum hoses. Took it to Chevy dealership two days ago (first chance I got), they told me it was the MAP sensor and that they had to replace the sensor and clean the fuel system* because there was buildup in the throttle body from running it with the bad sensor.

$400 later, everything's fine for a night, but yesterday my husband and I noticed that it was idling high, and it's having trouble shifting. It stays in the lower gear too long, RPMs go over 4 easily, and the vehicle jolts when it shifts.

This has NEVER happened before, so I'm hoping it's not a transmission thing, but I know very little about cars.
Is this something the dealership did when repairing my vehicle?
Should they fix it for free? I'd hate to see this car turn into a complete money pit.

Frown

*Reads on invoice as follows: PREMIUM FUEL SYSTEM SERVICEPERFORM FUEL INDUCTION DECARB SERVICECLEAN THROTTLE BODYPERFORM FUEL INJECTION CLEANER


kev2
Veteran
kev2 profile image

Aug 31, 2014, 10:02 AM

Post #2 of 3 (833 views)
Re: Idling and Shifting Problems after Check Engine Light "Fixed" at Dealership Sign In

return to the repair facility - ask for estimate and relate that your vehicle failed the same day they returned it to you as fixed.

I am guessing the CEL is on ?
The powertrain is computer controlled often an issue will cause the system into a default mode - RPM limits- no transmission shifts - possibly even the AC is disabled all expected as it 'deals' with an issue a DTC the often heard of code.


TotalNoob
New User

Sep 1, 2014, 10:13 AM

Post #3 of 3 (811 views)
Re: Idling and Shifting Problems after Check Engine Light "Fixed" at Dealership Sign In

No, CEL has stayed off since they worked on the car, air conditioning works fine, it does shift but we really have to baby it or the RPM jumps. I'm noticing that when I accelerate very slowly and steadily, it shifts without much of a jolt. Planning on bringing it back to the dealership asap, but they are closed for the holiday.






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