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hello friends i have a problem the car was stopped for while yesterday i tried to start the car and surprise the check engine light is on . from where should i start to fix the problem? can it be HV inverter wires or some blown fuse? thanks a lot......
 

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hello friends i have a problem the car was stopped for while yesterday i tried to start the car and surprise the check engine light is on . from where should i start to fix the problem? can it be HV inverter wires or some blown fuse? thanks a lot......

 

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Discussion Starter #3 (Edited)
Thanks a lot i have few more questeions can bad 12v battery be cause of DTC U1838? and are there any kind of fuses to check at.
first? and which one is T18 battery charger?
 

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Thanks a lot i have few more questeions can bad 12v battery be cause of DTC U1838? and are there any kind of fuses to check at.
first? and which one is T18 battery charger?







THE CAR WONT START AFTER FRONT ACCIDENT

Pic above taken from the thread you posted back in July following the accident which exposed your T18 Lear 3.3kW charger located directly behind the front bumper passenger side.

Pay particular attention to connectivity of pins K&L leaving the X1 connector as these provide the High Speed GMLAN Serial Data signals you seem to missing according to DTC U1838
 

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Discussion Starter #5
today i checked all fuses they are ok. than i move to trunk and i checked battery charger box wires it's next to 12 volt battery, it only has one HV wire and on other side it ground. i took the multimeter and check 12v battery voltage at first it vas 12.05V. then i check the voltage to that battery charger box. and the voltage was 11.8V. my friend told me it may be the issue of battery charger wich is in the trunk. what do you think guys? i don't know why but i think that my 12V battery is just too weak that's why i get this trouble..
 

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Discussion Starter #6
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also please look at this pic the HV connector in that place is little cracked i will add detailed picture tomorrow
 

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today i checked all fuses they are ok. than i move to trunk and i checked battery charger box wires it's next to 12 volt battery, it only has one HV wire and on other side it ground. i took the multimeter and check 12v battery voltage at first it vas 12.05V. then i check the voltage to that battery charger box. and the voltage was 11.8V. my friend told me it may be the issue of battery charger wich is in the trunk. what do you think guys? i don't know why but i think that my 12V battery is just too weak that's why i get this trouble..
Your friend thinks the HV battery charger is in the trunk?:confused:
APM is located in the rear of the Gen1 near the AGM battery but is not responsible for charging the HV battery pack...
 

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Discussion Starter #8
he is not experienced. so what do you think can it be faulty ARM charger or you think its HV battery charger in front of car? also as i said my battery is weak 12.05V can it be the cause of DTC?
 

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just to be clear - you/he were not able to start the car -- even with a jump from another battery via jumper cables ?
 

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Discussion Starter #10
the car starts but i have check engine light and DTC U1838. any advice how to check ARM charger?
 

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the car starts but i have check engine light and DTC U1838. any advice how to check ARM charger?
Check voltage at 12 volt battery after the car had been sitting a while, then start the car and check the voltage again. If the voltage is up a whole bunch the ARM charger is working, if not you can be sure it isn't working.
 

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Discussion Starter #12
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today i did some test, at first i disconnect the battery and check voltage, then i connect it and check it again, after that i start the car and checked voltage on battery and ARM
 

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can i use any type of 60AMP battery? or volt needs specific one?
The Volt's OE 12V battery should only be replaced with an equivalent Group 47 12V absorptive glass mat (AGM) battery. Do not install a conventional 12V lead-acid battery in the Volt. The 12V charging system is only designed to maintain an AGM type battery.
 

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The Volt's OE 12V battery should only be replaced with an equivalent Group 47 12V absorptive glass mat (AGM) battery. Do not install a conventional 12V lead-acid battery in the Volt. The 12V charging system is only designed to maintain an AGM type battery.
Definitely the original type AGM battery but not for the reason of charging differences.
The AGM for the Volt has a vent tube to keep gasses from being vented into the interior of your car. I bought a 12 model a year and a half ago and just decided to put a new battery in it. When I changed it I found it had a regular lead acid battery in it from a previous owner. It was charging just fine and I didn't know I was breathing acid fumes but It isn't a good idea to do so.
Here is where I bought my new battery-----https://www.ebay.com/itm/ACDelco-47AGM-Professional-AGM-Automotive-BCI-Group-47-Battery/153210426488?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Looks like the listing has ended, I paid $139 which was very cheap for an original equipment battery.
 

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Definitely the original type AGM battery but not for the reason of charging differences.
The AGM for the Volt has a vent tube to keep gasses from being vented into the interior of your car. I bought a 12 model a year and a half ago and just decided to put a new battery in it. When I changed it I found it had a regular lead acid battery in it from a previous owner. It was charging just fine and I didn't know I was breathing acid fumes but It isn't a good idea to do so.
Here is where I bought my new battery-----https://www.ebay.com/itm/ACDelco-47AGM-Professional-AGM-Automotive-BCI-Group-47-Battery/153210426488?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Looks like the listing has ended, I paid $139 which was very cheap for an original equipment battery.
A conventional lead-acid battery would not vent acid fumes but in the event of a collision or rollover the conventional battery case could rupture and spray sulfuric acid electrolyte solution inside the vehicle. When charging a conventional battery could vent hydrogen and oxygen gas but not acid fumes.

The AGM battery is a type of valve regulated lead acid battery that would only vent excess hydrogen and oxygen from the pressure relief valve if the battery was being excessively overcharged. The tube is attached to ensure that any gases vent outside the passenger compartment but in normal operation the AGM battery is sealed. The AGM battery allows engineers the flexibility of placing the 12V battery inside the passenger compartment of the vehicle, the AGM battery can be installed in any orientation due to being sealed. The vent tube is provided in case the battery ever is subjected to overcharging and needs to vent built up gases.

As a short-term solution you could install a conventional 12V lead-acid battery in the Volt until the correct AGM battery could be obtained but the specified charging voltages and charging curve of a conventional lead-acid battery and an AGM battery are not the same. A conventional 12V battery installed in the Volt would not be properly charged. An AGM battery could easily be damaged by overcharging using a conventional battery charger. If an AGM battery case were to rupture due to a collision very little electrolyte would leak from the battery as the electrolyte is fully contained in fiberglass matting like a damp sponge.
 

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Discussion Starter #19
ok now i see that AGM is much better but before i can find in good price range, can i install a regular 60AMP battery? and not to be afraid that the car will get any DTC and issue?
 

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ok now i see that AGM is much better but before i can find in good price range, can i install a regular 60AMP battery? and not to be afraid that the car will get any DTC and issue?
It should work until you can install the specified Group 47 AGM battery.
 
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