Hyundai Identifies Reasons for Ioniq 5’s 12V Battery Discharge and Discloses Solutions

Hyundai Ioniq 5 owners have reported 12-volt battery drain issues, leaving their cars unable to operate. Several owners have submitted their complaints on the InsideEVs Forum, with the earliest complaint being from July 2022. The 12-volt battery powers all the electronic components of the car, including screens, windows, and door locks. The owners have reported that the battery will drain, leaving them stranded and unable to access their vehicles.

Fortunately, Hyundai has found two causes for this problem and has implemented some solutions. The main cause of the issue is unauthorized Bluelink use by third-party apps that are waking up the car too often. Unauthorized third-party Bluelink apps are requesting information too frequently from the Ioniq 5, causing a significant draw on the battery until it goes to sleep. This issue has been resolved by limiting Bluelink server traffic to 20 transactions per day and blocking certain problematic unauthorized apps. Customers were also advised to change their Bluelink password.

The second cause of the issue, which was not covered in the video but was communicated to InsideEVs, is related to the Integrated Charging Control Unit (ICCU). To solve this issue, the ICCU and ICCU fuse need to be replaced. Some vehicles that only had the ICCU fuse replaced also incurred Diagnostic Trouble Code P1B77 as a result of ICCU failure. DTC P1B77 cases required the Power Relay Assembly (PRA) in the EV battery to be replaced as well.

Hyundai has confirmed that the ICCU campaign in Korea for coolant leak is not related to the above issue. The rumor that has been circulating on forums lately is false, and it only applied to vehicles before the 4/23/21 production. The above issues have not been specific to such a manufacturing period.

Most of the vehicles affected by the 12-volt battery drain issue have been resolved since January 31. However, some vehicles required 12V battery replacement due to failure to take charge after the battery was dead too many times or for too long before January 31.

If you own a Hyundai Ioniq 5, Kia EV6, or Genesis GV60 and have encountered 12V battery drain issues, please share your experience in the comments section.

1 comments
  1. Bought used with all issues supposedly addressed for battery issues. 12 volt battery is being vampire drained as soon as car is turned off. Running a BM2 to monitor voltage. Disconnect negative battery terminal, battery holds charge. Connect negative terminal, big spark and car drains the battery in about 40 minutes with car off. Taking to dealership tomorrow.

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