Anti-theft Light - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 04-09-2014, 04:08 AM Thread Starter
Join Date: Dec 2013
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Anti-theft Light

Hey everyone. I'm running into an issue where my anti-theft light is turning on and off causing the gauges on the car to bottom out and then reset back on again. There doesn't seem to be any issue with performance at all but still concerned. Any thoughts?

Thanks in advance for your time.

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post #2 of 4 (permalink) Old 04-09-2014, 08:40 AM
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Location: Ottawa, Canada
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Try this:

---------- Post added at 11:40 AM ---------- Previous post was at 11:36 AM ----------

Also this one:

http://www.c obalt

(remove the spaces in c obalt
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post #3 of 4 (permalink) Old 04-09-2014, 12:05 PM
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Have you checked fuse#25 TCM/ECM in the BCM. You seem to be losing GMLan and this fuse eventhough it is named TCM/ECM it is actually the GMLan translatter circuit. This circuit takes care of all communications between all CPUs (TDM,ECM,TCM,EBCM,BCM,IP and even radio) These are square waves and as a side effect it tends to corrode and pit the fuse tabs. Pull and spin fuse 180 or replace altogether. Esecially if it looks like this one.

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post #4 of 4 (permalink) Old 04-12-2014, 07:35 PM
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Hey Dr3wk,

I’m sorry to hear of this concern with your vehicle. I cannot guarantee anything, but I will be glad to take a further look into this for you. Please send us a private message referencing your concern if any extra help is needed. Thank you.

Kristen A.
Chevrolet Customer Care

Have you checked into Chevrolet Owner Center? You can maintain service history, check on warranty or recall information, and more. Visit!
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