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Discussion Starter #1
Hey guys! Friday night I got a CEL and started noticing some issues with my transmission while driving and shifting into reverse or drive.

I checked the CEL and the ONLY code I get is P0700, there are no associated codes.

There are a couple issues I am able to notice. The first is when I shift into drive or reverse it kinda 'slams' into gear. It kinda jerks the car and its a loud 'thunk'
Second is it doesn't seem to want to go into 4th gear. Driving at 60 mph I am up over 3000 rpms.

I am thinking it is a shift solenoid, but talking to a couple guys they were saying it sounds like the torque converter. I don't have any experience with auto trans maintenance and trouble shooting other than occasionally changing the fluid and filter, so any help is appreciated!
 

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Start by doing fluid level check and looking for leaks. Cobalts have been known to have fitting failures at the radiator. Then do a good cleaning and re-seating of connectors at the TCM and BCM. Reset the code and go try it out.
 

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Discussion Starter #3
I double checked the electrical connectors this morning, and they seem fine, next step for me is grab some fluid and see if it's low, figure I'll just buy the solenoids too so I can start working on that right away if the fluid top off doesn't work.
 

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Make sure your car is up to temperature and level on the hoist.
 

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On mine when it started doing this I cleaned all of the grounds in the engine bay (such as the one under the headlight) and then added a bolt through the tcm with a wire attached to it and ran it to the strut tower as a redundant ground. I also went and redid all of the wiring looms with a fabric cover instead of the cheap, brittle plastic that was installed in the first place. After all this my issue stopped. But usually if it's a ground issue, it'll throw a P0700 and then a Shift Solenoid A/B Low Voltage (but these cars sometimes have a mind of their own and don't throw any of the codes.)
 

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Discussion Starter #6
Sorry for the lack of response, I finally got the P0974 (P0973 I cant exactly remember now lol) code that called out the shift solenoid issue. I saw the solution you did on youtube, theseabass, but I already have enough random wires flying around my engine bay I didin't want to add another, and getting to where the solenoids are didn't seem very hard, and it wasn't. It took me a couple afternoons, and the hardest part is dropping the subframe which wasn't very hard. I'll give a brief run through here:

First lift up the front of your car and remove the wheels

Next remove the axle nut from the left hand side

Remove the LCA from the steering knuckle (on both sides)

Remove the drivers side axle from the transmission

Remove the 2 bolts attatching the steering rack from the subframe

Remove the sway bar bracket bolts and the sway bar end links

support the engine with a jack or an engine hoist

Remove the front and rear trans mounts

Remove the 4 subframe bolts and lower the subframe. (you'll want a jack or 2 for this depending how strong you are lol)

Now you have access to the side panel of the trans. there are like 9 or ten (I'm just guessing) bolts with a 13 mm head going all the way around. None of them were all that tight so taking them off was pretty easy. You will have to remove the shift cable bracket on the top by where the trans filler cap is (under the fuse box) and remove the cable from the shift arm or w/e its called.

Once youve done all that some gentle prying and the panel should pop right off. Some careful car yoga to wiggle the panel out and you are in. The solenoids are held in with a clip that you can easily pull out with a pair of pliers. Put the new solenoid in, and reverse the steps to put it all back together.

You will dump out almost all your trans fluid so be ready with about 7 qts of fluid when you are done, and always double check your torques.
 

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Did it work?
 
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