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The Mercedes-AMG GT 63 S E Performance’s documented problems are mainly software-related: a recall for possible loss of drive power, a drivetrain-control-unit campaign that can discharge the 12V battery, and a transmission shift characteristic that can feel like a jolt while coasting in E-Mode. The right response depends on the symptom and the vehicle identification number (VIN). A recall or campaign repair must be confirmed for your car by VIN and completed by an authorized Mercedes-Benz dealer; the available records do not establish a fleet-wide failure rate or prove that these are the most frequent faults on every GT 63 S E Performance.
This guide covers the four-door cars included in the records and the 2025 two-door coupe named in recall 25V-129. It explains what each notice says, how urgently to respond, what a dealer should check, and which apparent “fixes” do not address the underlying issue.
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What problems are documented for the GT 63 S E Performance?
Three model-specific issues have usable service or safety documentation:
- High-voltage starter-alternator control-unit software: Under recall 25V-129, a software error may cause the unit to fail and lead to loss of drive power.
- Drivetrain-control-unit software and 12V discharge: A separate Mercedes-Benz USA campaign says excessive quiescent current while the car is switched off can increase 12V battery discharge.
- E-Mode coasting jolt: A technical bulletin indexed for the 2024 model describes a noticeable jolt at roughly 20–40 mph while coasting, associated with the 5–4 neutral downshift strategy.
These records describe affected populations and prescribed remedies, not a statistical ranking of defects. A vehicle can have an open campaign without having failed, while an individual symptom can have another cause. Treat the VIN and the diagnostic findings as decisive.
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| Symptom or finding | Possible documented cause | Urgency | Correct first action |
|---|---|---|---|
| Drive power disappears, or a high-voltage/drivetrain warning appears | Starter-alternator control-unit software covered by recall 25V-129 | Immediate safety concern | Stop safely, contact roadside assistance or a dealer, and arrange a VIN recall check |
| 12V battery repeatedly goes flat or a low-battery warning appears | Drivetrain-control-unit quiescent-current software campaign | Prompt diagnosis; car may become unable to start | Ask a dealer to check campaign applicability and test the 12V system |
| Jolt while coasting in E-Mode around 20–40 mph | 5–4 neutral downshift strategy described in a 2024 bulletin | Schedule an assessment; urgent if accompanied by warnings or worsening harshness | Document conditions and ask a Mercedes-AMG technician to verify current service information |
| Any other warning, harsh shift, smoke, burning smell or fluid leak | Not established by the cited records | Varies; stop if safety is affected | Do not assume it is “normal”; obtain professional diagnosis |
Does the GT 63 S E Performance have an open loss-of-drive recall?
Some cars do. NHTSA recall 25V-129, reported February 28, 2025, covers certain model-year 2023–2024 GT 63 S E Performance four-door coupes and 2025 GT 63 S E Performance coupes. The notice says a software error may cause the high-voltage starter alternator control unit to fail, resulting in loss of drive power and an increased crash risk. The remedy is a free software update performed by a dealer.
The official notice states, “A loss of drive power increases the risk of a crash.” If your car loses propulsion, do not continue driving to see whether it recovers. Move to a safe location if possible, switch on the hazard lamps, and call roadside assistance or the dealer. High-voltage components and their orange cables are not owner-serviceable.
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How many cars are in recall 25V-129?
The NHTSA vehicle-population report lists 204 affected 2023–2024 GT 63 S E Performance four-door vehicles and 101 affected 2025 GT 63 S E Performance coupes. Those are campaign-population counts, not the number of confirmed failures and not a probability that an individual vehicle will fail. Eligibility is based on production records and VIN, so another car with the same model year may not be included.
Read the NHTSA recall report 25V-129 and the accompanying vehicle-population report for the official scope and remedy language.
How do I check whether my car is affected?
- Record the complete 17-character VIN from the vehicle, registration or insurance documents.
- Use the NHTSA vehicle-recall lookup and ask an authorized Mercedes-Benz dealer to check the manufacturer’s campaign system. A dealer check is important because manufacturer campaign status and repair history are VIN-specific.
- Ask whether recall 25V-129 is open, already completed, or not applicable. Request the repair order showing the campaign number and software update.
- If the car has a drive-power warning or has already lost propulsion, tell the dealer before arranging transport so it can be handled as a safety-related fault.
Do not pay for a software update that is the stated remedy for an open safety recall. If a dealer says the campaign is closed but the symptom remains, request a separate diagnostic assessment rather than assuming the recall explains every problem.
Why does the 12V battery keep going flat?
A separate MBUSA service campaign says the drivetrain control unit on specified AMG GT and AMG SL vehicles can draw excessive current while the vehicle is switched off. That increased quiescent draw can discharge the 12V battery. The stated remedy is another dealer software update, not simply installing a new battery.
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The campaign notification dated January 16, 2026 covers specified vehicles from model years 2022–2026 across the AMG GT and AMG SL platforms. It lists a combined population of 4,558 vehicles; the notice does not provide a GT 63 S E Performance-only count. Therefore, the figure cannot be used as the failure rate or prevalence for this specific model.
See the Mercedes-Benz USA drivetrain-control-unit software campaign notice for the campaign number (2025120009 / 25P5496614), scope and remedy.
What should I do after a low-battery warning?
- Note whether the warning appears after the car has been parked, whether the vehicle starts normally, and whether other electrical warnings are present.
- Have the dealer check your VIN for the drivetrain-control-unit campaign before authorizing parts replacement.
- Ask for a 12V battery state-of-health and charging-system diagnosis. A battery damaged by repeated deep discharge may need replacement, but a new battery does not remove an unresolved parasitic draw.
- Obtain confirmation that the software campaign was applied and that the vehicle passes the post-repair test.
A compatible 12V smart battery maintainer can be useful during extended storage only when the exact owner’s manual or dealer confirms the approved connection point and procedure. It is a storage aid, not a repair for excessive quiescent current. Do not connect equipment to high-voltage circuitry or improvise a charging method.
Why does the GT 63 S E Performance jerk while coasting in electric mode?
A bulletin indexed for the 2024 GT 63 S E Performance describes a noticeable transmission jolt in E-Mode at approximately 20–40 mph, chiefly while coasting. The indexed explanation links the sensation to the transmission’s 5–4 neutral downshift strategy. It says replacing hardware does not correct the underlying shift strategy and lists checks and adaptation procedures that may improve shift quality.
The available reference is a secondary bulletin index rather than the original Mercedes-Benz document. Ask a dealer to verify the current bulletin, your VIN’s applicability and the exact procedure before treating the sensation as an expected characteristic. The bulletin does not make every jerk harmless: a worsening event, a warning message, inability to select a gear, slipping, or loss of drive needs prompt diagnosis.
How should I document the symptom?
Give the technician repeatable details:
- Drive mode (E-Mode, Comfort, Sport or another setting).
- Approximate speed and whether the car was coasting, braking or accelerating.
- Whether the jolt occurs once during a 5–4 transition or repeatedly.
- Transmission temperature or cold-start conditions, if known.
- Any dashboard warning, abnormal noise, vibration or change in propulsion.
A road test and diagnostic scan can help the technician compare the event with applicable service information. The indexed bulletin mentions checking transmission oil level and carrying out dealer adaptations; those operations should be performed only with the manufacturer’s specified equipment and procedure. A generic consumer scanner or an owner-performed adaptation is not a substitute for the campaign or bulletin repair.
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For context, the 2024 AMG GT 63 S E Performance powertrain bulletin index is the source of the 20–40 mph and 5–4 neutral-downshift description. Because it is an index, confirm details with Mercedes-Benz before authorizing parts.
What should I do if the car loses drive power?
Loss of propulsion is the highest-priority symptom in the available data. Treat it as a roadside safety event, not as a routine software glitch.
- Control the vehicle: If steering and braking remain available, move out of traffic without attempting repeated acceleration tests.
- Secure the scene: Select Park only when safe, apply the parking brake, turn on hazard lamps and follow local roadside-safety rules.
- Do not access high-voltage hardware: Do not remove covers, disconnect orange cables or attempt a jump-start procedure unless the owner’s manual explicitly permits the exact operation.
- Call assistance: Tell the operator that the vehicle is a high-performance plug-in hybrid and has lost drive power. Request transport to an authorized Mercedes-Benz facility.
- Provide the VIN and warnings: Ask the dealer to check recall 25V-129 and any other open campaigns, then diagnose stored fault codes before clearing them.
If propulsion returns after a restart, still arrange professional inspection. An intermittent failure can recur, and a temporary recovery does not prove that the recall condition is absent.
How are a safety recall, a service campaign and a technical bulletin different?
A safety recall is an officially reported safety defect with a defined remedy, such as recall 25V-129. An open recall repair is generally performed without charge by the manufacturer’s authorized repair network, subject to the campaign’s terms and VIN eligibility.
A service campaign is a manufacturer-directed action for specified vehicles, often involving software or preventive work. The 2026 drivetrain-control-unit notice is a campaign covering selected AMG GT and AMG SL vehicles; it is not evidence that every GT 63 S E Performance has the condition.
A technical service bulletin gives technicians diagnostic or repair guidance for a symptom or condition. The indexed E-Mode bulletin can help a dealer evaluate a coasting jolt, but it is not a blanket declaration that every similar sensation is normal and it does not replace a recall check.
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Can a new battery or parts replacement fix these problems?
Only when testing shows that the component itself has failed. The documented remedies are software updates for the high-voltage starter-alternator control unit recall and the drivetrain-control-unit discharge campaign. Replacing a 12V battery without correcting an excessive draw may leave the underlying condition in place. Likewise, the indexed transmission bulletin says hardware replacement does not address the described 5–4 shift strategy.
Ask for the campaign or bulletin number, the diagnostic finding, and the completed repair description on the work order. If a dealer proposes expensive hardware before checking applicable software campaigns, request that the VIN-based campaign search and diagnostic results be documented.
Where can I find the correct owner’s manual?
Charging, storage, towing, warning-message and maintenance instructions vary by model year, market and body style. Use the correct edition in Mercedes-Benz USA’s Service & Warranty Manuals catalog for the AMG GT four-door Coupe, and confirm that it matches your VIN and market. Do not rely on a generic GT or another AMG model’s instructions for high-voltage or 12V procedures.
What the available evidence does—and does not—show
The cited records support specific actions: check recall 25V-129, check the 2026 drivetrain-control-unit campaign when 12V discharge is reported, and have a dealer compare a coasting jolt with the applicable transmission bulletin. They do not provide a representative denominator, owner-survey sample or confirmed-failure count from which to calculate reliability.
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- 204: affected 2023–2024 GT 63 S E Performance four-door vehicles listed in the recall population.
- 101: affected 2025 GT 63 S E Performance coupes listed in that recall population.
- 4,558: combined AMG GT and AMG SL vehicles in the 2026 drivetrain-control-unit campaign, not a GT 63 S E Performance-only total.
None of these numbers is a probability of failure. They are campaign populations, and VIN eligibility remains the deciding factor.
A practical decision path for owners
- Any loss of drive power or high-voltage warning: stop safely and arrange roadside assistance and dealer diagnosis.
- No propulsion issue, but recall status unknown: perform a VIN check for 25V-129 and request completion of any open safety repair.
- Repeated flat 12V battery: request the drivetrain-control-unit campaign check plus a battery and charging-system diagnosis; do not rely on a maintainer as the fix.
- Jolt while coasting in E-Mode: record the conditions, ask the dealer to verify the 2024 bulletin and current adaptations, and escalate if warnings or drivability problems accompany it.
- Unrelated or persistent symptoms: have the vehicle diagnosed rather than labeling them “common” from an anecdote or assuming one of these campaigns applies.
Keep copies of recall notices, VIN results, diagnostic reports and repair orders. That record helps a dealer identify repeat symptoms and establishes whether the software update was actually completed.
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Frequently Asked Questions
Can I drive my GT 63 S E Performance to the dealer for a recall repair?
If the car is operating normally and no loss-of-drive or high-voltage warning is present, ask the dealer whether they consider it safe to drive and follow its instructions. If propulsion has been lost or a related warning appears, use roadside transport rather than driving the vehicle.
Will disconnecting the 12V battery clear the battery-drain problem?
It may reset symptoms temporarily, but it does not correct excessive quiescent current from the drivetrain control unit. The VIN-specific software campaign check and a proper 12V-system diagnosis are still required.
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Is an E-Mode jolt proof that the transmission needs replacement?
No. The indexed 2024 bulletin attributes the described 20–40 mph coasting event to a 5–4 neutral downshift strategy and says hardware replacement does not address that cause. A dealer must still rule out other faults, especially when the jolt is severe, new or accompanied by warnings.
Are all 2023, 2024 and 2025 GT 63 S E Performance cars recalled?
No. Recall 25V-129 covers certain vehicles identified by production records and VIN. Model year alone cannot establish eligibility; check both the NHTSA lookup and Mercedes-Benz’s dealer campaign system.
Can an ordinary OBD scanner apply the required software updates?
The documented remedies specify dealer software updates, and the available data does not identify a compatible consumer tool. A scanner may read some information, but it is not a substitute for authorized campaign programming or high-voltage-system diagnosis.
