2024-2025 Mercedes-AMG GT 63 S E Performance recall and hybrid problems? Learn your California lemon law rights. Free case review.
You paid the price of a small house for one of the most powerful sedans on the planet. The Mercedes-AMG GT 63 S E Performance 4-Door promises 831 combined horsepower, a twin-turbo 4.0-liter V8 working in concert with a 150-kilowatt rear-axle electric motor, and a promise that technology and performance have finally merged without compromise. For many owners, much of that promise is delivered — until it isn't. This is one of the rarest, most complex automobiles sold in California: roughly 300 units sold in the U.S. across the 2024 and 2025 model years. Its rarity means documented problems take longer to surface in public databases — but they are surfacing. A federal safety recall (NHTSA 25V129) confirmed in March 2025 that the high-voltage starter-alternator control unit could fail without warning, cutting all drive power mid-journey. Five American owners filed warranty claims before Mercedes-Benz pulled the trigger on the recall — the first as early as April 2024. Beyond the recall, this vehicle carries the full complexity burden of marrying a hand-built AMG twin-turbo V8 to a rear-axle electric motor and a plug-in battery pack, layered over Mercedes' MBUX 2.0 infotainment architecture and the 9G-Tronic AMG SPEEDSHIFT MCT gearbox. Each of those subsystems has documented software and calibration challenges on related Mercedes platforms. When something goes wrong on a $250,000 automobile and your dealer tells you they cannot duplicate it, knowing your car's documented defect history — and your rights under California law — is the first step.
The issues owners report most, ranked by severity — each one verified against a cited NHTSA source.
car suddenly loses all power while driving; vehicle won't start after parking; multiple warning lights illuminate in instrument cluster without prior notice; hybrid system deactivates unexpectedly; car coasts to a stop on highway; dealer says 'cannot duplicate' but warning lights return; Service Hybrid System message appears; vehicle requires tow to dealership
check engine light does not illuminate when expected; dealer scan shows stored fault codes without a corresponding warning light; emissions or powertrain fault not flagged to driver; PHEV system behaves abnormally without triggering dashboard warning
touchscreen goes black and reboots while driving; MBUX screen freezes mid-navigation; audio system cuts out and restarts; instrument cluster data temporarily unavailable during reboot; Mercedes me connect app shows vehicle offline; dealer unable to duplicate intermittent freeze; software update resolves issue temporarily but freezes return
car won't start after sitting overnight or a few days; 12V battery dead despite recent charge; vehicle shows 'Low Battery' or 'Charge Battery' warning; repeated jump-starts or battery replacements required; PHEV functions unavailable due to low 12V voltage; dealer unable to find cause on first visit; battery tests as good but keeps draining
unexpected jolt or lurch when lifting off throttle; regenerative braking strength varies unpredictably between drives; harsh clunk when transmission downshifts under regen; brake pedal feels inconsistent — sometimes grabs hard, sometimes soft; powertrain confused between electric and combustion modes at low speed; car seems to 'dump' electric power suddenly when V8 spools up
brake pads worn below minimum within 15,000-20,000 miles; brake rotor cracking or grooving prematurely; brake squeal or grinding under moderate deceleration; brake warning light on at low mileage; brake pedal pulsation; brake fade on mountain or canyon driving; dealer says wear is 'normal for this performance vehicle'
A settled Margarian Law case on this exact model, published with the actual settlement math.
Open any defect for the symptoms and why it matters for a California lemon-law claim. Each is tied to a cited NHTSA source.
car suddenly loses all power while driving; vehicle won't start after parking; multiple warning lights illuminate in instrument cluster without prior notice; hybrid system deactivates unexpectedly; car coasts to a stop on highway; dealer says 'cannot duplicate' but warning lights return; Service Hybrid System message appears; vehicle requires tow to dealership
Under California Song-Beverly (Cal. Civ. Code §1793.2), a safety defect causing unexpected loss of propulsion — here confirmed by a federal recall — is among the strongest lemon-law triggers. An owner who has returned the vehicle for this failure and any related non-start events across multiple dealer visits before the recall remedy was available may have a compelling repeat-repair claim, particularly if the dealer issued 'cannot-duplicate' repair orders on earlier visits.
Software update to the HV starter-alternator control unit via XENTRY Diagnosis (Campaign 2025030012). Update was introduced into production from February 20, 2025. Dealer notified March 7, 2025; owner notification by April 29, 2025.
check engine light does not illuminate when expected; dealer scan shows stored fault codes without a corresponding warning light; emissions or powertrain fault not flagged to driver; PHEV system behaves abnormally without triggering dashboard warning
A MIL-masking defect is legally significant under Song-Beverly because it prevents the owner and dealer from identifying the root defect, inflating repair attempts. If a covered defect went undetected due to this software fault and caused secondary failures requiring additional dealer visits, those visits may count toward the statutory repair-attempt threshold.
Software update to 48V battery control unit via XENTRY Diagnosis (Campaign 2025070002). Dealer-performed; approximately 0.1 labor hours.
touchscreen goes black and reboots while driving; MBUX screen freezes mid-navigation; audio system cuts out and restarts; instrument cluster data temporarily unavailable during reboot; Mercedes me connect app shows vehicle offline; dealer unable to duplicate intermittent freeze; software update resolves issue temporarily but freezes return
Recurring MBUX freeze requiring multiple dealer software updates may qualify under Song-Beverly if the defect substantially impairs use, value, or safety — particularly because the instrument cluster is embedded in the MBUX display, meaning a freeze can briefly eliminate critical vehicle data. Document every dealer visit with a written repair order noting the reboot symptom.
OTA software update (Mercedes me connect) and/or dealer XENTRY reflash of head unit. For prior-generation 290 platform: Campaign MC-11020675. Persistent cases may require head unit replacement.
car won't start after sitting overnight or a few days; 12V battery dead despite recent charge; vehicle shows 'Low Battery' or 'Charge Battery' warning; repeated jump-starts or battery replacements required; PHEV functions unavailable due to low 12V voltage; dealer unable to find cause on first visit; battery tests as good but keeps draining
A recurring dead 12V battery requiring multiple dealer visits falls squarely within Song-Beverly's repeat-repair framework: if the vehicle has been in for the same non-starting defect two or more times and the defect persists, California law presumes it unreasonably impairs use and value. Document each no-start event with a repair order — even if the dealer only replaces the battery — because the underlying software cause persists until the drivetrain control unit is reflashed.
Software update to the drivetrain control unit (PTCU) via XENTRY Diagnosis. Campaign 2025120009 covers AMG GT 192/232 MY 2022-2026. If 12V battery is degraded from repeated deep discharge, battery replacement is also required.
unexpected jolt or lurch when lifting off throttle; regenerative braking strength varies unpredictably between drives; harsh clunk when transmission downshifts under regen; brake pedal feels inconsistent — sometimes grabs hard, sometimes soft; powertrain confused between electric and combustion modes at low speed; car seems to 'dump' electric power suddenly when V8 spools up
A recurring harsh engagement or lurch that cannot be corrected by the dealer after multiple visits may rise to the level of a drivability defect under Song-Beverly if it substantially impairs the vehicle's use or value. Document each dealer visit specifically identifying the 'clunk on regen lift' or 'harsh downshift' symptom so repair orders are consistent.
Powertrain control module (PCM) / AMG Drive Unit software recalibration. No dedicated recall or TSB confirmed as of June 2026; owners should request a XENTRY diagnostic session and inquire about any available AMG Drive Unit software campaigns.
brake pads worn below minimum within 15,000-20,000 miles; brake rotor cracking or grooving prematurely; brake squeal or grinding under moderate deceleration; brake warning light on at low mileage; brake pedal pulsation; brake fade on mountain or canyon driving; dealer says wear is 'normal for this performance vehicle'
If brake wear triggers a safety warning within the warranty period and the dealer fails to address the underlying cause — brake system specification inadequacy for the vehicle weight — each return visit for the same complaint counts toward Song-Beverly's repair-attempt trigger. Safety defects related to brake performance are among the highest-priority claim categories.
Pad and rotor replacement; Mercedes-Benz covers premature wear under warranty if wear occurs before manufacturer-defined mileage thresholds. Owners should document brake wear light activation mileage. Carbon-ceramic upgrade may extend rotor life but is customer-paid.
Every item below comes from this vehicle's documented defects. The more you recognize, the more a free case review is worth your time.
California's Song-Beverly Consumer Warranty Act (Cal. Civ. Code §1790 et seq.) entitles you to a replacement vehicle, full purchase-price refund (less a mileage offset), or a negotiated cash settlement if a warrantied defect substantially impairs your AMG GT 63 S E Performance's use, value, or safety and is not repaired after a reasonable number of attempts. A rebuttable lemon presumption arises when: (a) the same defect persists after four or more repair attempts; (b) two or more attempts were made for a defect likely to cause serious injury or death; or (c) the vehicle has been out of service 30 or more cumulative days. The HV starter-alternator failure in Recall 25V129 — an unexpected loss of propulsion on a highway — falls into the 'serious injury or death' category, meaning as few as two dealer visits for that failure may trigger the presumption. Recurring 12V drain events that prevent the car from starting may satisfy the four-attempt threshold if visits are documented. Song-Beverly requires Mercedes-Benz to pay your attorney's fees if you prevail, so you can exercise your rights without out-of-pocket legal costs. This is general information, not legal advice. No attorney-client relationship is formed. Law as of Jun 30, 2026.
“Could not duplicate” doesn't mean the defect isn't real. Here's exactly what to do to protect a potential California lemon-law claim.
Document the moment it happens. Photos, video, and screenshots of any warning lights — with the date and the mileage.
Get a repair order every visit — even “found nothing.” That paperwork is the foundation of a claim.
Check your VIN at nhtsa.gov/recalls. Note any recall that has no available remedy yet.
Track your out-of-service days. California law counts the cumulative days your vehicle spends in the shop.
Keep loaner & rental records. Alternate-transport paperwork during long repairs matters.
Save everything in one place. Symptoms, dates, repair orders, and every repeat visit — the intermittent ones especially.
1. DOCUMENT THE MOMENT IT HAPPENS. The instant your GT 63 S E Performance loses power, fails to start, or shows a warning, photograph the dashboard and note the date, mileage, battery charge level, and ambient temperature. Your phone camera is your best witness. 2. DEMAND A VERBATIM SYMPTOM ON THE REPAIR ORDER. Tell the service writer exactly what occurred — 'The hybrid system deactivated while driving at 65 mph; car coasted to a stop.' If they write 'customer states stall' and you said 'lost all drive power,' correct it before signing. The repair order language controls your lemon-law record. 3. REQUEST A FULL XENTRY DTC PRINTOUT. This PHEV logs fault events even when no warning light illuminates — Campaign 2025070002 confirmed the MIL can be suppressed by a software bug. Ask for stored and pending DTCs from the HV starter-alternator unit (G2/3), the drivetrain control unit (PTCU), and the 48V battery control unit (G1/3). 4. CHECK FOR ALL OPEN CAMPAIGNS. Ask the service advisor to verify VMI for every open campaign on your VIN. Recall 25V129 and Campaign 2025070002 must be completed before any other diagnosis. Request the repair order showing the campaign number and software build version installed. 5. REJECT 'NORMAL OPERATION' FOR SAFETY SYMPTOMS. Sudden loss of drive power and inconsistent brake feel are not normal on any vehicle. If the dealer claims it is, ask them to put the 'within spec' determination in writing with the technician's name. 6. PRESERVE EVERY PIECE OF PAPER. Repair orders, tow receipts, rental invoices, and dealer emails all matter. California counts cumulative days out of service.
The Mercedes-AMG GT 63 S E Performance 4-Door is an extraordinary machine that sits at the frontier of what a high-performance PHEV can be. It is also extraordinarily complex — and that complexity has produced real, documented problems in its first production years. A federal safety recall for unexpected loss of propulsion, a confirmed software campaign masking malfunction lamps, and a service bulletin for 12V battery drain are not minor inconveniences on a vehicle priced above $230,000. Owners who purchased this car expected AMG engineering to have solved these problems before they signed. For those whose car has required multiple dealer visits for the same complaint — particularly the HV system failure or no-start events — California's Song-Beverly Act may provide a meaningful remedy. Your repair orders tell the story the dealership may not want to tell.
— The Margarian Law team
If your Mercedes-AMG GT 63 S E Performance 4-Door has been to the dealer multiple times for hybrid power loss, no-start events, MBUX failures, or brake wear, you may have options. Margarian Law has handled thousands of California lemon-law cases and offers a free case review. Call us to evaluate your repair history.
A federal recall (NHTSA 25V129, March 2025) confirmed that the high-voltage starter-alternator control unit software can experience processor overload and deactivate the hybrid drive system without warning. The remedy is a software update performed by an authorized dealer under Campaign 2025030012. If your dealer has not performed this update, request it by VIN. If the car lost power more than once before the recall was completed, document each incident — those visits may count toward a California lemon-law claim.
Yes. NHTSA recall 25V129 (March 2025) covers certain 2023-2024 AMG GT 63 S E Performance 4-Door Coupe and 2025 AMG GT 63 S E Performance vehicles. The defect involves the high-voltage starter-alternator software, which can fail and cause unexpected loss of drive power. Approximately 305 vehicles on the 290 platform are affected. Dealers update the software at no charge. Check your VIN at nhtsa.gov or call MBUSA at 1-800-367-6372.
The MBUX infotainment system on the AMG GT 4-Door (290 platform) has documented software stability issues. Mercedes-Benz issued an OTA update campaign (MC-11020675, July 2025) for 86,568 vehicles on this platform — including the AMG GT 4-Door — to address MBUX software robustness gaps. A related recall (26V281, May 2026) confirmed that AMG GT infotainment units can reset and blank the instrument cluster while driving. Ask your dealer to check for open MBUX software campaigns on your VIN and to confirm OTA updates have been applied.
A January 2026 service campaign (2025120009) confirmed that AMG GT vehicles can experience excessive quiescent current draw from the drivetrain control unit software, draining the 12V starter battery. On a PHEV, 12V failure is especially disruptive because the high-voltage hybrid system depends on adequate 12V voltage to initialize. Ask your dealer to check for open drivetrain control unit software campaigns. If the battery has failed more than once, document each visit — repeated no-start conditions from the same software fault can support a California lemon-law claim.
It may be. California's Song-Beverly Consumer Warranty Act gives you the right to a refund or replacement if a warrantied defect is not repaired after a reasonable number of attempts. For a safety defect — like the loss of drive power documented in Recall 25V129 — as few as two repair attempts may trigger the lemon presumption. If your GT 63 S E Performance has been to the dealer multiple times for the same problem without a permanent fix, speak with a California lemon-law attorney. Margarian Law offers a free case review and represents clients at no out-of-pocket cost.
First, ask the service advisor to note your exact symptom — 'hybrid system lost power / car would not restart' — on the repair order in writing, even if they cannot duplicate it. Then request a XENTRY diagnostic scan of all control units, specifically the HV starter-alternator unit and PTCU. Fault events are logged even without a warning light. Ask for a printout of all stored and pending DTCs. Make sure Recall 25V129 has been completed on your VIN. Each dealer visit where the symptom is documented — even without a fix — counts toward your lemon-law repair attempts under California law.
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