Kia bulletin TSB_TRA112
What it saysThis bulletin provides information to replace the transaxle assembly and upgrade the Hybrid Control Unit Low-Voltage DC Converter (HCULDC) software on some 2022-2024MY Sorento Plug-In Hybrid (MQ4 PHEV) vehicles equipped… NHTSA’s full summary ↓
Kia filed this with NHTSA as a service bulletin dated Sep 9, 2025, received Sep 12, 2025, about the power train. It names 3 model years (2022–2024). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
TECHNICAL SERVICE BULLETIN: TRANSAXLE ASSEMBLY REPLACEMENT & HCU LOGIC IMPROVEMENT - This bulletin provides information to replace the transaxle assembly and upgrade the Hybrid Control Unit Low-Voltage DC Converter (HCULDC) software on some 2022-2024MY Sorento Plug-In Hybrid (MQ4 PHEV) vehicles equipped with a 1.6L T-GDI engine and All-Wheel Drive (AWD), produced from June 29, 2021 through January 10, 2024. Some vehicles may experience an illuminated Malfunction Indicator Lamp (MIL) with DTC P0C4E00 stored, accompanied by a rough transition when the vehicle switches between EV and HEV motive power.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| TSB_TRA112 | Service bulletin | Sep 9, 2025 | 11023106 | PDF, 592 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 3 model years this bulletin names have filed 447 complaints with NHTSA since 2015. 115 of them name Power Train — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2022 Kia Sorento, the 12 owners who gave an odometer reading for Power Train reported it at a median of 21,067 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The drive train and motor slow to a near stop in traffic when trying to clear a lane and makes it very dangerouos for other traffic to have to wait for me to clear a lane. There is something wrong and we complained about this before the warranty ran out, but they could not find anything. The car stops in traffic unexpectedly.
2022 Kia Sorento · Power Train · filed with NHTSA Mar 11, 2026 · ODI 11723548
First AWD Coupler failed at approximately 25,000 miles. It was replaced and the replacement AWD Coupler is failing at approximately 55,000 miles. As the AWD Coupler fails, when accelerating from a stop and turning, a loud clunking sound is heard from the vehicle and a jerking motion is felt.
2024 Kia Sorento · Power Train · filed with NHTSA Jul 31, 2026 · ODI 11753955
1. First incident occurred on 10/29/24. My wife pulled into driveway and placed car into Park. When she shifted to reverse, the transmission didn't respond and the car revved to a very high RPM when she took foot off of brake, no foot on gas. Unable to shift it to go forward or backward.
2023 Kia Sorento · Power Train · filed with NHTSA Dec 11, 2024 · ODI 11630256
In depth: 2022 Kia Sorento transmission and drivetrain problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the power train
Source: same model, same component group9 other manufacturer communications filed against the Kia Sorento under the same component group (power train), newest first. The eight newest are listed; the rest are on the Kia list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB_TRA046_R5 | Service bulletin | Apr 17, 2025 | TECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE - This bulletin has been revised to include additional information. New/rev… |
| TSB_TRA111_R1 | Service bulletin | Aug 22, 2024 | TECHNICAL SERVICE BULLETIN: 8-SPEED DUAL CLUTCH TRANSMISSION EOP SENSORLESS LOGIC IMPROVEMENT - This bulletin has been revised to include ad… |
| TSB_TRA111 | Service bulletin | Jul 31, 2024 | TECHNICAL SERVICE BULLETIN: 8-SPEED DUAL CLUTCH TRANSMISSION EOP SENSORLESS LOGIC IMPROVEMENT - This bulletin provides information to improv… |
| TSB_TRA046_R4 | Service bulletin | May 16, 2024 | This bulletin provides information relating to the correct transmission fluid type and fill quantity requirement for each Kia model. A flush… |
| TSB_TRA108_R1 | Service bulletin | Apr 25, 2024 | TECHNICAL SERVICE BULLETIN: 4WD COUPLING ACTUATOR ASSEMBLY REPLACEMENT - This bulletin has been revised to include additional information. N… |
| TSB_TRA105_R1 | Service bulletin | Apr 8, 2024 | TECHNICAL SERVICE BULLETIN: 4WD COUPLING NOISE INSPECTION AND SNAP RING REPLACEMENT - This bulletin has been revised to include additional i… |
| TSB_TRA105 | Service bulletin | Nov 15, 2023 | TECHNICAL SERVICE BULLETIN: 4WD COUPLING NOISE INSPECTION AND SNAP RING REPLACEMENT - This bulletin provides information to inspect for a kn… |
| TSB_TRA108 | Service bulletin | Sep 28, 2023 | TECHNICAL SERVICE BULLETIN: 4WD COUPLING ACTUATOR ASSEMBLY REPLACEMENT - This bulletin provides information to replace the AWD coupling actu… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Kia, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Kia TSB_TRA112 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the TSB_TRA112 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Kia warranty extension on file lists the ones Kia has filed.
Which vehicles does TSB_TRA112 cover?
The manufacturer filed it against 3 model years: 2024 Kia Sorento, 2023 Kia Sorento, 2022 Kia Sorento. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: 2022 -2024MY Sorento Plug-In Hybrid (MQ4 PHEV): built 29 Jun 2021 – 10 Jan 2024; Sorento PHEV (MQ4 PHEV): built 29 Jun 2021 – 10 Jan 2024 — the build date is on the certification label in the driver’s door jamb.