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post #1 of 9 (permalink) Old 12-14-2014, 11:53 PM Thread Starter
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Question My Car Jerks Hard when Shifting.

A few months ago my car started doing this, just every once in a while.
This has now become an everyday problem.

So here is whats going on, when I shift my car from P-D or R-D it jerks and you can hear sort of a thud. When accelerating and shifting it is a hard shift and the car jerks forward. it seems to be the worst when shifting from 1-2.
The check engine light is not on.

One thing I have noticed is when the car is started cold it definitely will have this problem.
If the coolant warms up to at least 160 and I turn the car off and restart it, the problem is gone and my car shifts like normal.

I have a 2005 Cobalt base model. It is an automatic. 2.2 L
Thanks in advance for any input!
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post #2 of 9 (permalink) Old 12-15-2014, 02:40 AM
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You should have a communication code. This problem has often been solved by cleaning the 2 blue connectors on the BCM or try removing the connectors on the TCM, PCM and spray contact cleaner. Disconnect battery first. I suggest doing one connector at a time and testing. This way you will which one cured your problem.

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post #3 of 9 (permalink) Old 05-08-2015, 09:07 PM
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Quote:
Originally Posted by Coby7 View Post
You should have a communication code. This problem has often been solved by cleaning the 2 blue connectors on the BCM or try removing the connectors on the TCM, PCM and spray contact cleaner. Disconnect battery first. I suggest doing one connector at a time and testing. This way you will which one cured your problem.


I'm having the same exact problem! It's made me extremely nervous because I replaced the transmission last summer because clutch material was clogging the shift 1-2 sensors.


I know I have a bad rear transmission mount which might cause clank when shifting from P-R-D.

Do you have pictures and locations for these contacts to try cleaning? I'd really appreciate it!


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post #4 of 9 (permalink) Old 05-09-2015, 05:29 AM
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I just had to clean those ones not too long ago, the car had some intermittent problems with a chime sounds and the RPMS were going crazy. Cleaning those connections solved the problem...

I read all about it in another of Coby7 post, THANKS btw!

BCM is by the passenger seat at the fuse box ( there was my problem, had some corrosion ) you will need a 6MM deep socket to reach the bolt and then spray contact and some electrical grease. Will be the best to insert / pull out a few times just to make sure that everything will be clean.

The TCM / PCM are in the engine compartment driver side . Those ones are locked in place with some clamps and they have good rubber gaskets so they were clean on my car but I still put some dielectric grease and clamp them back.

If you are gonna clean them one at a time I would start with the BCM .

Good luck!
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post #5 of 9 (permalink) Old 05-09-2015, 05:36 AM
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post #6 of 9 (permalink) Old 05-09-2015, 06:53 AM
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Quote:
Originally Posted by Coby7 View Post

So just unplug those two big blue connectors?


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2005 Chevrolet Cobalt 2.2L Base Coupe Automatic
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post #7 of 9 (permalink) Old 05-14-2015, 11:35 AM
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Today I didn't have much time to clean each connector and test drive each so I just cleaned them all at the same time. The ones I cleaned and greased were the bcm plugs, the ecm/tcm fuse in the fuse panel, the G105 ground point and the ground point under the drivers side headlight. I only took two pictures to show some of the things needing cleaning.

I'll post an update soon on how the car feels now.





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2005 Chevrolet Cobalt 2.2L Base Coupe Automatic
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post #8 of 9 (permalink) Old 06-01-2015, 12:00 PM
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Quote:
Originally Posted by samsnerk View Post
A few months ago my car started doing this, just every once in a while.
This has now become an everyday problem.

So here is whats going on, when I shift my car from P-D or R-D it jerks and you can hear sort of a thud. When accelerating and shifting it is a hard shift and the car jerks forward. it seems to be the worst when shifting from 1-2.
The check engine light is not on.

One thing I have noticed is when the car is started cold it definitely will have this problem.
If the coolant warms up to at least 160 and I turn the car off and restart it, the problem is gone and my car shifts like normal.

I have a 2005 Cobalt base model. It is an automatic. 2.2 L
Thanks in advance for any input!
had same problem at first then it hung up in 2nd
code was for the shift solenoid 1-2
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post #9 of 9 (permalink) Old 06-02-2015, 07:22 AM
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Originally Posted by Trikeman72 View Post
had same problem at first then it hung up in 2nd

code was for the shift solenoid 1-2

That's what was wrong with mine last year. New transmission had to be installed.

2005 Chevrolet Cobalt 2.2L Base Coupe Automatic
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