Intermittent Gauges and DIC - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 18 (permalink) Old 09-27-2012, 05:17 AM Thread Starter
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Intermittent Gauges and DIC

I'm still having intermittent gauge problems with DIC indicating things like Low Fuel and Power Steering. This all started about 2 weeks after the power steering motor was replaced in the recall. Also transmission hard shifting is usually one of the problems that come with this.
About 3 months ago I removed every connection to the ECM, BCM, TCM and Fuse block, cleaned with electronic connector cleaner and applied dielectric grease, then reconnected. Everything seemed to clear up except hard shifting. I took it into Chevrolet for diagnostics. Car had almost 40000 miles on it.
Problems was diagnosed to be the internal transmission harness had high resistance. When they removed the harness they told me it looked like something has smashed a section of the harness. After replacing the harness the transmission shifted normally and no more intermittent problems... for about 3 months, then everything started again. This has been going on now for about 20k miles. Sometimes turning off the car and restarting it will correct everything including hard shifting and sometimes the hard shifting is still there until an extended time before restarting. I've read that the ignition switch in the steering column, not ignition cylinder, can cause this if it is becoming intermittent in applying 5Volts to the computer buss. I've bought an AC Delco ignition switch but have been hesitant to replace it for fear that the anti-theft system will need to be reset with a Tech-2 scanner.

Can someone let me know if I can change the ignition switch without requiring a trip to the dealer after replacement on the back of a wrecker?
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post #2 of 18 (permalink) Old 09-27-2012, 05:40 AM
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Disconnect Your battery, change the switch and re-connect, then you should have no problem with the "TDM". If you still have hard shift problems after this, try cleaning the ground terminal (G105) on your engine or at least making sure it is tight.

Low fuel is probably a seperate problem. GM has a solvent you add to a full gas tank that cleans the sending unit and clears the intermittents that cause your low fuel indication to come on.

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Last edited by Coby7; 09-27-2012 at 05:45 AM.
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post #3 of 18 (permalink) Old 09-27-2012, 05:44 AM Thread Starter
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Thanks Coby7. Is G105 on the front drivers side of the engine?
I'm going to change the switch this weekend if nothing more pressing comes up.
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post #4 of 18 (permalink) Old 09-27-2012, 05:47 AM
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post #5 of 18 (permalink) Old 09-27-2012, 07:01 AM Thread Starter
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Thanks for the diagram and photo. Those always help. I'll work on that ground this weekend also.
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post #6 of 18 (permalink) Old 09-27-2012, 10:01 AM Thread Starter
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I found instructions for replacing the lock cylinder on AutoZones website but could not find instructions for replacing the switch itself. I assume to replace the switch I have to remove the lock cylinder, then remove the switch. Is there any additional dis-assembly required beyond the lock cylinder before I can access the switch?
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post #7 of 18 (permalink) Old 09-27-2012, 10:16 AM
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I will look it up when I get home. Seems to me you don't have to pull the cylinder. It just sits on the end held in with two screws.

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post #8 of 18 (permalink) Old 09-27-2012, 06:30 PM
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Here is the how to from the GM service manual that I just downloaded. READ THE LAST PART

---------- Post added at 10:30 PM ---------- Previous post was at 10:11 PM ----------

30-Minute Immobilizer Relearn
This 30-minute relearn procedure will relearn the start enable password between the theft deterrent module (TDM) and the engine control module (ECM).

With a master vehicle key, turn ON the ignition, with the engine OFF.
Observe the security indicator. After approximately 10 minutes, the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1-3 two more times for a total of 3 cycles or 30 minutes.
Important: The vehicle learns the password on the ignition switch transition from OFF to RUN. You must turn the ignition OFF before attempting to start the vehicle.

With a master vehicle key, start the vehicle. The vehicle has now learned the key transponder information and/or the ECM has now learned the fuel continue password.
If additional keys are required to be learned, refer to Adding Keys .
With a scan tool, clear any DTCs.

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post #9 of 18 (permalink) Old 09-28-2012, 05:47 AM Thread Starter
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Is the master vehicle key something that only dealers have or is it one of the keys that came with the car?
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post #10 of 18 (permalink) Old 09-28-2012, 05:54 AM
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Yes, that is all the keys programmed that you normally use to start your car.

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Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

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Last edited by Coby7; 10-01-2012 at 01:50 PM.
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