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post #1 of 21 (permalink) Old 12-17-2018, 11:59 AM Thread Starter
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Shifter locks in Park

The shifter, 2007, auto trans , locks in park. Seat belt on, foot on brake, doors locked, sitting snug in the seat, it locks in park when I tried to go. I turn it off and start over, sometimes it works fine, other times it locks in park. Tried lifting my foot off then on the brakes, toggle the lock switch, lock unlock the belt, sqiggle in the seat to make the switch click. Nothing makes sence, then all of a sudden it unlocks and I go.
I don't have a code reader right now and I thought this might be a problem someone else experienced here.
I'm pretty sure it has to do with one of the switches not sending or working correctly.
Any imput on this is welcome, Thanks.
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post #2 of 21 (permalink) Old 12-17-2018, 01:10 PM
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I never had this problem with any of my 3 Cobalts but did with my wife's G6. Turns out they have the same BCM and in my wife's G?'s case I just removed the 2 blue/gray connectors ( P1 & P2 )from the BCM sprayed them with brake cleaner, let them dry, added a bit of dielectric grease and voilà! It hasn't acted out since, this was 2 winters ago.


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post #3 of 21 (permalink) Old 12-17-2018, 03:44 PM Thread Starter
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Thanks Coby7, I'll give it a try. This was weird as only intermittent electrical problems often are. While I'm at it I'll check as many connectors as I can find. This is Florida and humidity has been known to cause problems with corroded connections.
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post #4 of 21 (permalink) Old 12-18-2018, 03:06 PM Thread Starter
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So I poked around the engine bay power/fuse box and found it to be loose. Looking for a way to tighten things up I caused a spark from the positive battery treminal to the regulator or whatever. Now the display on the speedometer is flashing, service traction and power steering. The temp reading and most other information is gone also. Tried disconnecting the battery positive in the trunk to reboot the system but everything is the same.
Tomorrow in the light I'll check for blown fuses. I really need to pick up a code reader before I really make a mess.
What a day........
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post #5 of 21 (permalink) Old 12-18-2018, 05:50 PM
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Yeah you probably blew a fuse. Report back...

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post #6 of 21 (permalink) Old 12-18-2018, 08:35 PM
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Wait, little off topic, but the g6 uses the same bcm as cobalts? I thought they were different and the reason the g6 shifter couldn't be made to work in the cobaltc
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post #7 of 21 (permalink) Old 12-19-2018, 05:40 AM
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Quote:
Originally Posted by rrob5382 View Post
Wait, little off topic, but the g6 uses the same bcm as cobalts? I thought they were different and the reason the g6 shifter couldn't be made to work in the cobaltc
Based on Rock Auto, no, they don't. It shows the G6's BCM as being in the Malibu and Aura, which makes more sense.

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post #8 of 21 (permalink) Old 12-19-2018, 07:00 AM
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They have a different firmware but are electronically the same. Physical appearance is identical.


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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; 12-19-2018 at 07:02 AM.
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post #9 of 21 (permalink) Old 12-19-2018, 07:09 AM
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Well yeah, why would GM spend extra money to use a different module housing - especially at that time.

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1998 Chevrolet Cavalier - Wrecked/Donated
2007 Chevrolet Cobalt LT - M62 Supercharger, Ported Throttle Body, 42 lb/hr Injectors, Intense 2.9" Pulley, Cobra Heat Exchanger, SS/TC Exhaust, TTR Engine and Trans Mounts, Trifecta Tune, ZZP Header and Downpipe, '08+ FE5 Struts/Shocks, SSC Springs, FE5 Control Arms, SS/SC Front Swaybar, Powell Hardcore Rear Swaybar, 18" MSR 045s, Dunlop ZIIs, Nightshaded Tails/Side Markers, Shorty Antenna, Black Bowties, Black Grilles, Black Headlights, Dual JL 12" w1v2 Subs, A/D/S Front/Rear Speakers, Pioneer 7" Touchscreen, G85 Recaros, Leather Rear Seats, 160 MPH Cluster.
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post #10 of 21 (permalink) Old 12-19-2018, 12:32 PM Thread Starter
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Alright , I really screwed up. The part I grounded the terminal to is the TCM trans controller, controls the shifting of the automatic. Right now the car is stuck in low gear. Auto zone read the codes and U0101 lost communication to TCM came up. Tried to reboot by disconnecting the battery again, no good. I'm going to have to get this part now, we need the car now.
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