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Discussion Starter #1
Perhaps a bad GPS cable, but I can't find the proper replacement to buy a new one. Dealership was no help, unfortunately. I would attach images, but the system won't let me because my post count is too low.
 

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Sorry. Your description of the problem is too brief for me to grasp it. Could you provide details and the model year of your Volt?
 

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CAL most likely means calibration. Looks like your GPS needs re-calibration. If you suspect a cable issue, consult a service manual for repair/parts. CHILTON has them.

No time for full charge appears if you have a departure time or TOU setting, and the available time is not sufficient to get a full charge.
 

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Discussion Starter #4
Sorry for the sparse details this morning. 2013 model. Is there a cable for the GPS that runs underneath the vehicle?

I would post photos or links to them if I was able, but there appears to be some rule linking post count to image posting approval.
 

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Is your onstar light also red?

Look under the dash, far left side where the obd2 port is. The onstar box is there and it has a breakout you'll see the blue gps that goes to the radio/nav and pink? and maroon ( dont remember the colors ) cables that go to the onstar module. Check to see if any of those are loose. They are "kickable"

If you undo the screw above the obd2 port you can drop the module out and the antennae connectors there go to the onstar module and the gps receiver and back out to that splitter. Check those. Although I'd find it very difficult to remove or dislodge them.
 

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Discussion Starter #7
So all those wires and fuses are good. Is there a wire/cable for the GPS that runs underneath the vehicle?
 

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To all, I'm still having this issue and I don't know what needs replacing in order to fix it. Any thoughts among the crowd?
 

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Okay, I have a suggestion. I remember a few years back having an issue where the compass heading at the top of the driver display did not display a heading and might have said CAL some of the time, and there were a couple other indications I can't remember clearly, though probably the OnStar light was not lit (should normally be green).

IIRC I believe it was fuse F9 in the left side of the instrument panel, but look in the fuse blocks (or the manual diagrams of the fuse blocks) for any related to OnStar. With the car off, yank the fuse, wait 10 seconds to a minute, and plug it back in. This should hopefully reset the related module. (I don't have the big maintenance manual (yet), but my impression is that the OnStar module is basically the circuit card of a cell phone that has a GPS chip of some sort on it that they are using for GPS position; anyone who actually knows please correct me if I'm wrong.)

Hope this helps a little.
 

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This points to a loss of communication between the antenna on the roof and the on-star module. The GPS signal and all other radio transmissions run from the antenna to the on-star and main radio head units. The On-Star modules handles the failed items you listed.
 

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Well, I tried pulling that fuse with no effect on the system. My OnStar light is green for about a minute or so and then turns red.
 

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Well, I tried pulling that fuse with no effect on the system. My OnStar light is green for about a minute or so and then turns red.
I'd guess that your On-Star module has failed then.
 

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Discussion Starter #13
I can still make OnStar calls, start my car remotely, unlock it remotely and get diagnostics from OnStar, though.
 

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I can still make OnStar calls, start my car remotely, unlock it remotely and get diagnostics from OnStar, though.
In this case you have either a main radio head unit failure or the cable between the on-star module and the radio head unit has disconnected or failed. I'm staying away from thinking it's a BCM (Body Control Module) simply because you haven't reported other issues that would point to the BCM.
 
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