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post #1 of 14 (permalink) Old 06-07-2016, 04:57 AM Thread Starter
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Mechanic Stumped on "Gas/bad Shifting"

My trusted mechanic has had my sons 2007 Cobalt (118k) for 2 weeks and is stumped.

The car seems to have trouble shifting (auto) into the next gear and will rev past 3k until you "feather" the gears into place.

The usual fuel filter replacement etc. was done and I don't believe the car is giving up any codes. He seems to think the transmission itself is fine as it has the problem with all the gears?

I didn't pay much for the vehicle but would like it to last awhile for university use.

We have had it for 5 months and so far I have:

4 dealer recalls (locked ignition key etc.)
Replaced signal switch
Replaced driver door speaker.
Fuel filter and lines replaced.

Any help would be much appreciated, thank you.
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post #2 of 14 (permalink) Old 06-07-2016, 06:44 AM
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May just be a bit of corrosion on the BCM P1 and P2, just unplug them and re-plug a couple of times and make sure they are well seated. Maybe add a little dielectric grease to keep the moisture out.


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post #3 of 14 (permalink) Old 06-07-2016, 09:36 AM Thread Starter
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Thank you for the quick reply.

Will forward to mechanic asap.
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post #4 of 14 (permalink) Old 06-07-2016, 10:52 AM
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If he has a good code reader, there should be a communication code set between BCM / TCM and cluster.

Maybe also flip the fuse in the upper left corner called ECM/TCM in case it has corroded too!!!!


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Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

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Last edited by Coby7; 06-07-2016 at 10:54 AM.
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post #5 of 14 (permalink) Old 06-07-2016, 12:59 PM
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Quote:
Originally Posted by Coby7 View Post
If he has a good code reader, there should be a communication code set between BCM / TCM and cluster.
And if he doesn't have a good code reader, find a better mechanic!


Quote:
Originally Posted by Plain Jane View Post
Believe me, these cars have a habit of growing on their owners. Your feelings will only strengthen over time...
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post #6 of 14 (permalink) Old 06-07-2016, 01:15 PM
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There are some very good mechanics out there that don't have a high end code reader that would let them check that.
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post #7 of 14 (permalink) Old 06-08-2016, 07:06 AM
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Haha, it was just a joke. I thought the idea of a professional mechanic without all the tools was a bit funny.


Quote:
Originally Posted by Plain Jane View Post
Believe me, these cars have a habit of growing on their owners. Your feelings will only strengthen over time...
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post #8 of 14 (permalink) Old 06-08-2016, 09:39 AM
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A communication code would just verify what I think the OP's problem is. It wouldn't confirm but would sure tell this is the right track to pursue.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

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post #9 of 14 (permalink) Old 06-09-2016, 10:07 AM Thread Starter
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Picking up today as it appears to be fixed.

The mechanic said "transmission Range Sensor" problem I think.
It wasn't allowing the vehicle to shift properly and over revved.

Time will tell, picking up today or tomorrow.

BTW, thank you for the suggestions.
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post #10 of 14 (permalink) Old 06-09-2016, 04:59 PM
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''Transmission Range Sensor'' , I think you will be visiting your mechanic soon. This sensor will not make your transmission shift hard, in fact once the shifter is in drive, this sensor doesn't do anything other than to tell the CPUs that the car is expected to go forward.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly

Last edited by Coby7; 06-09-2016 at 05:48 PM.
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