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post #1 of 4 (permalink) Old 05-20-2018, 07:55 PM Thread Starter
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05 Cobalt No Speedometer,Not Shifting and Power Steering Message

Hi all,

I have the issue with my 2005 cobalt with the speedometer not working, the car does not shift and the power steering message displays on the dash.

I have tried grounding the TCM and changing the associated fuse but the issue persist.

I read on this fourm some people replace their output speed sensor.

How hard is this to do? Will I lose transmission fluid?
I found this thread ( https://www.yourcobalt.com/forums/pro...ed-sensor.html ) but I am not sure If I can just purchase the part and plug in the new one or are there more steps?

If this does not work I guess I will try replacing the TCM.

I brought my car to my mechanic and he can not figure it out. I do not really have any mechanical skills but I am trying my best to wing it. Any help would be greatly appreciated.
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post #2 of 4 (permalink) Old 05-25-2018, 06:54 PM
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any dtc's
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post #3 of 4 (permalink) Old 05-28-2018, 06:12 PM
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Clean and re-seat connectors on ECM, TCM and BCM. I suggest you do this one module at a time so you know which one is causing loss of communication. You may not have a CEL but I'm sure you have a pending "U" code or in history. Once you find which connector was causing it clean again and add dielectric grease. I would start with the 2 blue/gray connectors on the BCM, this is where the GMLan gets amplified clipped and restored. You may also want to check your oil pressure sending unit to make sure it's not leaking oil and then running down along the wires all the way to the ECM. Oil in a connector tends to wreak havoc.
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post #4 of 4 (permalink) Old 05-28-2018, 07:08 PM
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Sounds like something I would write. Oh wait exactly what I wrote in a previous post... word for word.


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Last edited by Coby7; 05-28-2018 at 07:11 PM.
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