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Mercedes-Benz — recall

Automotive · Japan · 2025-05-15

Origin: ドイツ連邦共和国

Mercedes-Benz vehicles: starter-alternator control program design flaw, monitoring function incorrect.

Country	Japan
Category	Automotive
Published	2025-05-15
Country of origin	ドイツ連邦共和国
Manufacturer	Mercedes-Benz Japan LLC
Models affected	Mercedes-AMG S63E Performance, Mercedes-AMG GLC63S E Performance, Mercedes-AMG GLC63S E Performance Coupe, Mercedes-AMG GT63S E Performance Coupe, Mercedes-AMG GT63S E Performance, Mercedes-AMG SL63S E Performance
Units affected	967
Defect	In the control program for the high-voltage starter-alternator, due to insufficient design review, the system's monitoring function may incorrectly detect a malfunction and stop the operation of the high-voltage starter-alternator. As a result, during hybrid driving, motor assist will be lost, which may increase fuel injection and lead to an increase in exhaust gas emissions. Furthermore, during electric-only driving, to protect the high-voltage battery, the high-voltage circuit may be shut off, potentially rendering the vehicle inoperable.
Component	Powertrain (High-voltage starter-alternator)
Remedy	For all vehicles, the control program for the high-voltage starter-alternator will be rewritten with the updated control program.
Recall number	外-3991
Official notice	View source ↗

What this means for sellers

Likely platform / channel actions	OEMs/dealers will run the remedy (repair, replace or refund); component suppliers in the chain may face traceback.
Self-check for comparable products	Check your comparable products' design, materials and QC records against the defect described here.
Rules & standards likely involved	the destination market's product-safety rules and mandatory standards

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