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Lost GPS signal

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18K views 23 replies 9 participants last post by  maxbee25  
#1 ·
My truck lost its GPS signal-the Driver info screen says "CAL," and my compass always says "N." The owners manual recommends driving to an "open area," so it can re-acquire a signal. Well, I've been driving around for a couple of days now, plenty of open areas to one degree or another, and it still says "CAL," and "N." Any suggestions? Thanks...
 
#2 ·
This is a 2015, right?

In the old days, you had to go to an open area and drive around in a slow circle to allow it to re-acquire it's bearings.
 
#10 ·
Is there by chance a turn off GPS feature?

Driving around in circles in an open area sounds like an easter egg in the owners manual. They put that in there just to see if anybody read it. I have a GPS running watch (with a small antenna) and it gets signal in the woods. Not with great accuracy, however it has signal. There are times when it takes a while to acquire, in open areas or not. But it has not failed me in 4 years.

I'd like to watch you guys driving around in circles.

Anyway, If there are no on/off controls for GPS then I'd say contact the service department. And get it logged as another feature that works intermittently.
 
#12 ·
The drive around in circles was simply for re-setting the compass: Not sure about the GPS. Had same issue with my 2001 Tahoe and my 2009 Wrangler. Agree if the GPS is truly off, then either a reset or a service call.
 
#11 ·
Sounds like an episode of "The Carbonaro Effect"
 
#13 ·
LOL, well, the OnStar light in the mirror is green--still no GPS signal tho. I didn't have anyplace to go tonight so haven't tried the circle drive trick but I'll take it out sometime soon and see if I can get a lock. Shucks, I should just hit the onstar button and ask them for help-maybe save me a drive back to the dealership.
 
#15 ·
I can see the operators at Onstar central now, elbowing the operator next to them...Hey check it out, they're doing it, they're doing it. I'm gonna wait til he's done and tell him to go clockwise instead! Then I'm gonna tell him to rub his calf on the assist step to finalize the process.
 
#19 ·
The calibration procedure is valid and is required only for the digital compass using a Hall-effect magnetoinductive or magnetoresistive sensors.

It is not required for the GPS or a true magnetic compass.

Background for the calibration procedure.
Calibration is the process used with all non magnetic sensors to separate the earth's magnetic field from magnetic field distortions created by the environment into which the sensor is placed. An example of this would be the hard-iron magnetic distortions created by the engine and body of an automobile. By implementing a simple calibration routine with the sensor in a fixed position within the car, the maximum and minimum field strengths can be determined and then used to correct the sensor output for the distortions present.
 
#21 ·
Well, the dealership replaced my faulty Onstar module yesterday--took a couple of hours. The bad unit was just a flat box, about 6"X8"-looked like your typical black mystery computer box. It was behind the dash but they didn't have to do much disassembly and they seem to have got it all back together correctly--no gaps or noises. Sure is nice to have all my little gadgets working again! My media is accessible again, my Compass works, Navigation is back...looks like it's good and fixed!