# Service bulletin SC343\_TSB\_R1

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11025858
- Published by NHTSA: 2025\-12\-01
- Manufacturer's number: SC343\_TSB\_R1
- Manufacturer's date: 2025\-11\-18
- Campaign id or software version: SC343
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: PDC LOGIC IMPROVEMENT AND PRA REPLACEMENT FOR DTC PIB7700 \(SC343\) \- This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information to upgrade the Powernet Domain Control ‘PDC’ system software on certain 2025MY EV6 \(CV1a\) vehicles produced from December 10, 2024 through June 24, 2025, built at a Kia assembly plant in the US. Due to a PDC software logic error in the subject vehicle, the pre\-charge resistor may become damaged if the vehicle is abnormally turned ‘OFF’ \(e.g. turned ‘OFF’ while the gear selection is in ‘Neutral’\). If the pre\-charge resistor becomes damaged, the vehicle may not go into ‘READY’ mode. Customers may experience the illumination of the service warning light, and the vehicle may set DTC P1B7700. If DTC P1B7700 is stored, technicians are to replace the PRA before upgrading the ‘PDC’ software.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025858-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025858-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Trouble codes named

P1B77

## Vehicles listed

- 2025 KIA EV6

## Other bulletins for the same vehicles and component

- [PI2606\_TSB](/bulletins/11037375.md), 2026-09-18, Service bulletin: ELECTRICAL SYSTEM. TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: This bulletin provides information to upgrade the 12\-volt battery \(“12V battery”\) diagnostic software for certain 2025MY EV6 \(CVa\) vehicles produced from December 17, 2024 through November 5, 2025. The subject vehicles are equipped with a 12V battery which requires periodic inspection and maintenance. To provide enhanced monitoring of the 12V battery’s performance, the software upgrade will periodically conduct 12V battery performance tests and provide drivers with advance notice of sub\-optimal 12V battery performance.
- [PI2606\_OWNR](/bulletins/11037374.md), 2026-09-18, Other: ELECTRICAL SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: OWNER NOTIFICATION \(PI2606\) \- This document is the owner notification advising that Kia is conducting an important Product Improvement Campaign on certain 2025 MY EV6 vehicles, manufactured from December 17, 2024 through November 5, 2025, to upgrade the 12\-volt battery \(“12V battery”\) diagnostic software logic.
- [PI2606\_QA](/bulletins/11037373.md), 2026-09-18, Other: ELECTRICAL SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: QUESTION AND ANSWER \(PI2606\) – This document is the Question and Answer Guide containing the most frequently asked questions regarding Product Improvement Campaign PI2606.
- [PI2606\_DPSM](/bulletins/11037372.md), 2026-09-18, Other: ELECTRICAL SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: DEALER PARTS AND SERVICE MANAGER MEMO \(PI2606\) \- This document is the announcement to dealer Parts and Service managers advising that Kia is conducting an important Product Improvement Campaign on certain 2025 MY EV6 vehicles, manufactured from December 17, 2024 through November 5, 2025, to upgrade the 12\-volt battery \(“12V battery”\) diagnostic software logic.
- [PI2606\_DP](/bulletins/11037371.md), 2026-09-18, Other: ELECTRICAL SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: DEALER PRINCIPAL MEMO \(PI2606\) \- This document is the announcement to the dealer principals advising that Kia is conducting an important Product Improvement Campaign on certain 2025 MY EV6 vehicles, manufactured from December 17, 2024 through November 5, 2025, to upgrade the 12\-volt battery \(“12V battery”\) diagnostic software logic.
- [PI2605\_TSB](/bulletins/11036781.md), 2026-09-03, Other: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT CAMPAIGN: BMU LOGIC IMPROVEMENT \(PI2605\) \- This bulletin provides information regarding a Battery Management System \(BMS\) software update for certain 2025\-2026 EV6 \(CV1 eGT, CVa\) vehicles as listed in the table below. To improve the diagnostic monitoring of the high\-voltage battery in the subject vehicles, Kia has developed enhanced BMS software to improve the detection logic and system response in cases of moisture intrusion into the high\-voltage battery.
- [TSB\_CLI049\_R2](/bulletins/11036628.md), 2026-09-02, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. TECHNICAL SERVICE BULLETIN: PARTIAL REPAIR – ELECTRICAL A/C COMPRESSOR \- This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information regarding the partial repair of the Air Conditioning \(A/C\) compressor assembly on some 2011MY\~ Optima Hybrid \(TF HEV, JF HEV/PHEV\), 2015MY\~ Soul EV \(PS EV\), 2017MY\~ Niro \(DE HEV/PHEV/EV\), 2022MY\~ EV6 \(CV\), 2021MY\~ Sorento \(MQ4 HEV/PHEV\), 2023MY\~ Sportage \(NQ5 HEV/PHEV\), and 2023MY\~ Niro \(SG2 EV/HEV/PHEV\) vehicles.
- [PI2605\_QA](/bulletins/11036467.md), 2026-08-29, Other: FUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: QUESTION AND ANSWER \(PI2605\) \- This document is the Question and Answer Guide containing the most frequently asked questions regarding the Product Improvement Campaign PI2605.
- [PI2605\_OWNR](/bulletins/11036466.md), 2026-08-29, Other: FUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: OWNER NOTIFICATION \(PI2605\) \- This document is the owner notification advising that Kia is conducting a Product Improvement Campaign on certain 2025\-2026 MY EV6 vehicles to upgrade the Battery Management System \(BMS\) diagnostic software logic. Our records indicate that you own or lease one of the potentially affected vehicles.
- [PI2605\_DPSM](/bulletins/11036465.md), 2026-08-29, Other: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. PRODUCT IMPROVEMENT CAMPAIGN: DEALER PARTS AND SERVICE MANAGER MEMO \(PI2605\) \- This document is the announcement to the dealer Parts and Service managers advising that Kia is conducting a Product Improvement Campaign on certain 2025\-2026 MY EV6 vehicles, manufactured from December 17, 2024 through May 29, 2026, to upgrade the Battery Management System \(BMS\) diagnostic software logic.

JSON: [/v1/bulletins/11025858](/v1/bulletins/11025858)

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