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post #1 of 4 (permalink) Old 04-02-2014, 01:47 PM Thread Starter
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Help please! My son bought a used 2010 Chevy Cobalt in November. Within a few days, he started having problems with it. All of the gages on the dashboard started going crazy, the gas guage would go up and down, it said low fuel. The check engine light would come on and he couldn't tell how fast he was going. The tacometer display would say things like power steering, low fuel, etc. The car would also, jerk a little when this happened. We can't figure out what is causing this. Has anyone else had similar problems?
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post #2 of 4 (permalink) Old 04-02-2014, 03:18 PM
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Your losing GMLan communication. There's a fuse in the BCM upper left corner that corrodes and pits from the square waves from data. Change or flip this fuse to clean its tabs and terminals. Try this first if it fixes it it cheap. Not always the cure but has been for a few.

OEM radio?


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post #3 of 4 (permalink) Old 04-03-2014, 06:23 AM Thread Starter
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Thank you so much, I will try that. As for the radio, we were told when we bought the car that the radio doesn't work and that they would put a new one in but, my son doesn't trust this place very much so, he never took it back to have a new radio installed. Do you think that could be part of the problem?
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post #4 of 4 (permalink) Old 04-03-2014, 06:47 AM
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Low speed GMLan wire is a dark green wire that goes to all the modules, TCM, ECM, TDM, radio, RKE and BCM. Some people while installing new radios have mixed up this wire with an other green wire leading to similar symtoms. If you still have problems after changing the low speed GMLan fuse, I would look at disconnecting the radio completely if it's not working anyways. What ever is wrong with the radio might be pulling the GMLan circuit down to the point that it makes it malfunction. This car is like a LEGO, everything snaps together, so very easy and simple to take the dash apart. Dk-Gr wire in question is seen here on pin #38.


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