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......
DTC U1838 CHECK ENGINE LIGHT ON. PLEASE HELP
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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
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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Your friend thinks the HV battery charger is in the trunk?
APM is located in the rear of the Gen1 near the AGM battery but is not responsible for charging the HV battery pack...
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.
I would say your battery is junk and your charger is operating as it should.
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.
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.
I just looked, it's $143, which is still a pretty good deal with free 1-day shipping.
It should work until you can install the specified Group 47 AGM battery.
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