Volkswagen bulletin 4C6D
What it saysEngine/Motor Control Module software update for DTC 0456 NHTSA’s full summary ↓
Volkswagen filed this with NHTSA as a service bulletin dated Jun 24, 2026, received Jan 7, 2026, about the engine — 2 documents under this number: V0125042078297_5, V0125042078397_4. It names 6 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 communicationEngine/Motor Control Module software update for DTC 0456
Trouble codes it names: P0456 all 1 read from the document itself; NHTSA’s summary names none
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| V0125042078297_5 | Service bulletin | Jun 24, 2026 | 11034615 | |
| V0125042078397_4 | Service bulletin | Dec 10, 2025 | 11027251 |
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 6 model years this bulletin names have filed 609 complaints with NHTSA since 2015. 245 of them name Engine — 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 Volkswagen Taos, the 17 owners who gave an odometer reading for Engine reported it at a median of 24,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The contact owns a 2022 Volkswagen Taos. The contact stated that while at a complete stop, the vehicle would intermittently stall upon depression of the accelerator pedal. The contact stated that the "shift to park" warning message would appear on the instrument panel as the contact would restart the vehicle and resume normal driving.
2022 Volkswagen Taos · Engine · filed with NHTSA Apr 19, 2022
The contact owns a 2024 Volkswagen Taos. The contact stated while driving at an undisclosed speed, the vehicle stalled. The vehicle was driven to the shoulder of the road. The check coolant warning light was illuminated. The contact stated that while attempting to start the vehicle, the vehicle failed to start.
2024 Volkswagen Taos · Engine · filed with NHTSA Oct 2, 2025
Car has been at the Henderson VW repair shop 30 days. Two months ago coolant light was on. Took it in and they topped it off. No paperwork. Next a 20,000 maintenance-. No alerts. Last month coolant light again. Took it in - blown head gasket at 22,000 miles
2022 Volkswagen Jetta · Engine · filed with NHTSA Apr 15, 2024
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 engine
Source: same model, same component group60 other manufacturer communications filed against these Volkswagen models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Volkswagen list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| V0126032083018_1 | Service bulletin | Aug 20, 2026 | Update Programming of the Engine/Motor Control Module -J623- |
| V1718062017813_24 | Service bulletin | Jul 9, 2026 | Oil Consumption Measurement and Electronic Oil Consumption Measurement |
| TT 13-20-01_3 | Service bulletin | Jun 18, 2026 | Instruction, how to lubicate engine before initial start. |
| TT 10-18-02_2 | Other | Jun 18, 2026 | Lubricating engine components before reassembly. |
| V1719012012855_81 | Service bulletin | Jun 4, 2026 | Volkswagen Engine Oil Standards |
| VOS-26-21 | Service bulletin | Mar 27, 2026 | This is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: A… |
| SM 57-2025 | Other | Nov 10, 2025 | This special notice is to inform dealers to return the parts listed and only order the successor parts going forward. |
| 527B | Service bulletin | Nov 5, 2025 | Update Programming, Engine/Motor Control Module -J623-, DTC P055F or engine oil message. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Volkswagen, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Volkswagen 4C6D 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 4C6D 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.
Which vehicles does 4C6D cover?
The manufacturer filed it against 6 model years: 2024 Volkswagen Jetta, 2023 Volkswagen Jetta, 2022 Volkswagen Jetta, 2024 Volkswagen Taos, 2023 Volkswagen Taos, 2022 Volkswagen Taos. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.