[Mcavell09]

A few days ago I had my windshield replaced by Safelite. All went well but now I'm stranded at a restaurant with my son on a 95 degree day. Car goes into " Initializing - wait to shift" mode but nothing ever happens. Everything else works fine Windows operate, radio and everything else works just no main battery power. Throws code P0C78. I tried clearing it with a code reader and it come right when I try to start the car again. I have tried disconnecting the negative on the 12v for 10 minutes same issue. I tried resetting the car by holding in power button for however many seconds and then walking away for a half hour. I have read that there are sensors on the windshield and if not hooked back up correctly they could be a problem. Any other ideas? I am pretty certain I will have to have the car towed to dealer at this point.

Thanks

 

[Aseras]

P0C78 is bad. That's not from the windshield. That's just bad timing.

If it were a sensor you could use the "pocket" to start the car.

 

[jcanoe]

A few days ago I had my windshield replaced by Safelite. All went well but now I'm stranded at a restaurant with my son on a 95 degree day. Car goes into " Initializing - wait to shift" mode but nothing ever happens. Everything else works fine Windows operate, radio and everything else works just no main battery power. Throws code P0C78. I tried clearing it with a code reader and it come right when I try to start the car again. I have tried disconnecting the negative on the 12v for 10 minutes same issue. I tried resetting the car by holding in power button for however many seconds and then walking away for a half hour. I have read that there are sensors on the windshield and if not hooked back up correctly they could be a problem. Any other ideas? I am pretty certain I will have to have the car towed to dealer at this point.

Thanks

I recall viewing a video on Youtube that covered replacing a windshield on a 2017 Volt here. I recall that there is a bracket that needed to be attached to the new glass for the forward collision camera but no other wires. Maybe your issue is unrelated to your recent windshield replacement.

 

[scottf200]

A few days ago I had my windshield replaced by Safelite. All went well but now I'm stranded at a restaurant with my son on a 95 degree day. Car goes into " Initializing - wait to shift" mode but nothing ever happens. Everything else works fine Windows operate, radio and everything else works just no main battery power. Throws code P0C78. I tried clearing it with a code reader and it come right when I try to start the car again. I have tried disconnecting the negative on the 12v for 10 minutes same issue. I tried resetting the car by holding in power button for however many seconds and then walking away for a half hour. I have read that there are sensors on the windshield and if not hooked back up correctly they could be a problem. Any other ideas? I am pretty certain I will have to have the car towed to dealer at this point.

Thanks

Wonder if that code is similar to what is on the GM Spark.

 

[Mcavell09]

P0C78 is bad. That's not from the windshield. That's just bad timing.

If it were a sensor you could use the "pocket" to start the car.

I unfortunately feel you are correct. I'm going to try replacing the 12v battery just for fun and see if that would do it but I am not very optimistic.

 

[somms]

If it is being caused by a faulty K10, you could attempt to remove the CHCM fuse and see if this makes any difference.

Otherwise, Gen1 Service Manual points to either a failed HPCM2 or battery pack as being possible culprits for this specific P0C78 DTC...good luck!

 

[Mcavell09]

Just to let anyone interested know, the volt has been in the shop for 3 days still with nothing to report. I will continue my updates if we ever figure this out.

Thanks

 

[turboguy327]

Just to let anyone interested know, the volt has been in the shop for 3 days still with nothing to report. I will continue my updates if we ever figure this out.

Thanks

Probably would have helped the tech if you didn’t delete all the history for him... They should charge extra for the extra work.

 

[Tacoma]

What year is your Volt?

 

[Aseras]

Probably would have helped the tech if you didn’t delete all the history for him... They should charge extra for the extra work.

Codes are stored in history, FOREVER. You don't see them with a regular obd2 tool, but you can with GDS.

 

[Mcavell09]

What year is your Volt?

2012 - manufactured late 2011 183,000 miles m/l.

 

[Mcavell09]

Probably would have helped the tech if you didn’t delete all the history for him... They should charge extra for the extra work

Thanks for such a thoughtful reply. As most know your history stays on the car when using an at home style tester plus I picture and write down everything. The tech says he appreciates the knowledge and help.

Also in the almost 7 years I have owned this car if I never trouble shot the issue myself I would have been in the shop at least once a year for random little issues like the battery coolant sensor, a few software bugs in the 2012 or just getting bad gas once. When your battery is out of warranty if you're smart you'll research and fix the things you can yourself.