Hyundai DC/DC Converter Input Voltage Sensor Fault
DC/DC Converter Input Voltage Sensor Fault
Quick answer
For certain U.S. 2022–2023 Hyundai Ioniq 5 and 2023 Hyundai Ioniq 6 vehicles, this alert is associated with DTC P1A9096 and an ICCU (Intelligent Charging Control Unit) fault that can cause low 12-volt auxiliary-battery charging. Hyundai’s service campaign directs inspection and, depending on results, an ICCU software update or ICCU replacement.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does DC/DC Converter Input Voltage Sensor Fault mean?
For certain U.S. 2022–2023 Hyundai Ioniq 5 and 2023 Hyundai Ioniq 6 vehicles, this alert is associated with DTC P1A9096 and an ICCU (Intelligent Charging Control Unit) fault that can cause low 12-volt auxiliary-battery charging. Hyundai’s service campaign directs inspection and, depending on results, an ICCU software update or ICCU replacement.
2. Technical explanation
Hyundai identifies P1A9096 as “DC/DC Converter Input Voltage Sensor Fault.” In the cited manufacturer communications, an ICCU fault may cause low charging of the 12-volt auxiliary battery and set this DTC. The supplied evidence does not establish a more specific component-level root cause beyond the ICCU fault condition described in the service campaign.
3. What system is affected?
ICCU (Intelligent Charging Control Unit) / DC-DC conversion and 12-volt auxiliary-battery charging system.
4. How serious is this code?
Potentially significant. Hyundai states that, when this fault occurs, the vehicle may enter reduced-power mode and display a message instructing the driver to stop the vehicle.
5. Symptoms you may notice
- Low 12-volt auxiliary-battery charging.
- Possible reduced-power mode.
- Various warning lights may illuminate.
- An audible chime may sound.
- A large instrument-cluster message may appear instructing the driver to stop the vehicle.
6. Possible causes
- An ICCU fault, as described in Hyundai’s service campaign.
- Not yet established by verified evidence: any more specific underlying component or wiring cause.
7. Can I still drive the vehicle?
Not yet established by verified evidence. Hyundai states that the vehicle may enter reduced-power mode and may instruct the driver to stop the vehicle if the fault occurs. Follow the vehicle’s displayed instructions and arrange Hyundai service.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- If the instrument cluster instructs you to stop, follow that instruction.
- Arrange inspection by an authorized Hyundai dealer or qualified Hyundai service facility.
- Do not attempt high-voltage or ICCU repairs yourself.
10. Step-by-step troubleshooting
- Have a service facility check for DTC P1A9096.
- Have the ICCU system inspected following Hyundai Service Campaign 997 / bulletin 23-01-060H procedures.
- Not yet established by verified evidence: owner-performed diagnostic steps.
11. When to contact service
Contact an authorized Hyundai dealer to determine whether Service Campaign 997 / bulletin 23-01-060H applies to the vehicle and to have the ICCU system inspected.
12. What the service center may check
- Check for DTC P1A9096.
- Inspect the ICCU system under Hyundai’s service procedure.
- Perform the campaign-directed repair path based on inspection results.
13. Possible repair or resolution
- An ICCU software update may be required.
- ICCU replacement may be required.
- The supplied evidence also identifies the campaign as involving ICCU and fuse replacement checks; exact repair selection is determined by Hyundai’s service procedure.
14. Affected vehicles
- Hyundai Ioniq 5 · 2022–2023 · US
- Hyundai Ioniq 6 · 2022–2023 · US
15. Related TSBs / service bulletins
- Hyundai Service Campaign 997 / Technical Service Bulletin 23-01-060H, published July 17, 2023.
- NHTSA Manufacturer Communication 10240086: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2020-2024.zip#nhtsa_id=10240086
- NHTSA Manufacturer Communication 10240085: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2020-2024.zip#nhtsa_id=10240085
16. Recall information
- Not yet established by verified evidence. The supplied sources identify a Hyundai service campaign, not a recall.
17. Official manufacturer information
Verified official evidence: Hyundai bulletin 23-01-060H / Service Campaign 997, published through NHTSA on July 17, 2023. It covers certain U.S. 2022–2023 Ioniq 5 (NE1) and 2023 Ioniq 6 (CE1) vehicles for the described ICCU condition and P1A9096.
- NHTSA: NHTSA Manufacturer Communication 10240085: 23-01-060H · official_tsb
- NHTSA: NHTSA Manufacturer Communication 10240086: 23-01-060H · official_tsb
19. Frequently asked questions
What does P1A9096 mean?
Hyundai identifies P1A9096 as “DC/DC Converter Input Voltage Sensor Fault.”
What vehicles are covered by the supplied evidence?
Certain U.S. 2022–2023 Hyundai Ioniq 5 and 2023 Hyundai Ioniq 6 vehicles.
What can happen when this fault occurs?
Hyundai states that low 12-volt auxiliary-battery charging may occur, and the vehicle may enter reduced-power mode with warning lights, an audible chime, and a stop-vehicle message.
What is the documented repair?
Hyundai directs ICCU-system inspection. Depending on results, an ICCU software update or ICCU replacement may be required.