Faulty PDR GPS ?

redsoxjaz · 09-14-2021, 10:43 AM

I hope this is the best forum for this question, I figure most of us 1LE owners are the users of the PDR system.

For two track days I have had issues with the PDR System.

On my first track day I had a heck of a time marking the start/finish, the button would be greyed out and claim I was not in view of satellites. Finally got it marked ten minutes into the last session.

On my second track day the PDR did not recognize the previously marked line, so I switched to a new card and attempted to mark a new line but had the same problems from day 1...... I did finally get it marked but the system had a hard time tracking my car correctly. It only began timing and tracking my car after about 10 minutes of driving. (see attached photo).

Has anyone replaced the gps antenna under warranty or on their own? Any advice to "reboot" or clean up the system on a track day so it finds the car?

THANKS.

MatthewAMEL · 09-15-2021, 09:38 PM

Were those two track days weeks/months apart or the same weekend?

In aviation we use a RAIM Forecast. It's basically a GPS outage map.

There are also some parts of the country that can't use GPS due to interference from local signals.

https://sapt.faa.gov/outages.php?out...Resolution=0.5

If your phone has no issues with GPS location while right next to your car, then I would start suspecting something is up with the vehicle.

redsoxjaz · 09-16-2021, 08:19 AM

Thanks for the reply and the link. The course is near an Air Force Base but the outings were a month apart and Racechrono Pro had no issues working from my iPhone.

I have made an appointment with the dealer, but I always like to self-fix if I can. Doesn't seem like that's a possibility here.

xriry · 09-20-2021, 08:42 PM

The last track day I did, the GPS seemed to bounce around for the majority of the time it was recording. Then near the end it found the track. The next session the gps tracking was fine. weird.

tomster · 08-31-2023, 05:42 AM

I am having these same problems with my 22ZLE. So far on 3 different tracks. While my buddy with me in a 18 ZLE on the same day isn't having any trouble.

I never had this problem with my 18ZLE or my 18CTS-V.
Has any one found a fix?

I dropped my car off to the dealership yesterday to look at this and a rear diff noise. It would be nice to show them a example where the same problem was resolved.

tomster · 08-31-2023, 06:15 AM

https://youtu.be/ikoag09HUqQ?si=slMxJDAYNOGVUnTP

09-14-2021, 10:43 AM	#1
redsoxjaz Drives: 2021 2SS-1LE-A10 Join Date: Aug 2017 Location: Nebraska Posts: 21	Faulty PDR GPS ? I hope this is the best forum for this question, I figure most of us 1LE owners are the users of the PDR system. For two track days I have had issues with the PDR System. On my first track day I had a heck of a time marking the start/finish, the button would be greyed out and claim I was not in view of satellites. Finally got it marked ten minutes into the last session. On my second track day the PDR did not recognize the previously marked line, so I switched to a new card and attempted to mark a new line but had the same problems from day 1...... I did finally get it marked but the system had a hard time tracking my car correctly. It only began timing and tracking my car after about 10 minutes of driving. (see attached photo). Has anyone replaced the gps antenna under warranty or on their own? Any advice to "reboot" or clean up the system on a track day so it finds the car? THANKS.

09-15-2021, 09:38 PM	#2
MatthewAMEL Drives: 2023 CT5 Blackwing Join Date: Sep 2016 Location: Orlando Posts: 1,617	Were those two track days weeks/months apart or the same weekend? In aviation we use a RAIM Forecast. It's basically a GPS outage map. There are also some parts of the country that can't use GPS due to interference from local signals. https://sapt.faa.gov/outages.php?out...Resolution=0.5 If your phone has no issues with GPS location while right next to your car, then I would start suspecting something is up with the vehicle. __________________ 2017 HBM SS 1LE Sold 2023 Wave Metallic CT5-V Blackwing M6

09-20-2021, 08:42 PM	#4
xriry Drives: 2018 Camaro SS 1LE Join Date: Apr 2021 Location: Milwaukee Posts: 1	The last track day I did, the GPS seemed to bounce around for the majority of the time it was recording. Then near the end it found the track. The next session the gps tracking was fine. weird. Attached Images

08-31-2023, 05:42 AM	#5
tomster RedLine Drives: 2022 ZL1 1LE Join Date: Dec 2012 Location: Chicago area Posts: 792 View My Garage	I am having these same problems with my 22ZLE. So far on 3 different tracks. While my buddy with me in a 18 ZLE on the same day isn't having any trouble. I never had this problem with my 18ZLE or my 18CTS-V. Has any one found a fix? I dropped my car off to the dealership yesterday to look at this and a rear diff noise. It would be nice to show them a example where the same problem was resolved. __________________ 2018 GMC 2500 "Blue" (Sold) 2018 ZL1 1LE Hyper Blue" (Sold) 2018 CTS-V "Black" (Sold) 2022 GMC 2500 "Blue" 2022 ZL1 1LE 6spd "Rapid Blue" 2023 ZL1 1LE Auto Rapid Blue (ordered)

08-31-2023, 06:15 AM	#6
tomster RedLine Drives: 2022 ZL1 1LE Join Date: Dec 2012 Location: Chicago area Posts: 792 View My Garage	https://youtu.be/ikoag09HUqQ?si=slMxJDAYNOGVUnTP __________________ 2018 GMC 2500 "Blue" (Sold) 2018 ZL1 1LE Hyper Blue" (Sold) 2018 CTS-V "Black" (Sold) 2022 GMC 2500 "Blue" 2022 ZL1 1LE 6spd "Rapid Blue" 2023 ZL1 1LE Auto Rapid Blue (ordered)

09-16-2021, 08:19 AM	#3
redsoxjaz Drives: 2021 2SS-1LE-A10 Join Date: Aug 2017 Location: Nebraska Posts: 21	Thanks for the reply and the link. The course is near an Air Force Base but the outings were a month apart and Racechrono Pro had no issues working from my iPhone. I have made an appointment with the dealer, but I always like to self-fix if I can. Doesn't seem like that's a possibility here.

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