Denial of Motor Vehicle Defect Petition
Published Date: 1/16/2025
Notice
Summary
NHTSA reviewed a petition about a possible problem with the 48-volt electrical system in 2023 Mercedes-Benz GLC300 cars that caused warning lights and starting issues. After checking all the info, they decided no defect investigation or recall is needed right now. So, owners of these cars can keep driving without worry, and no new costs or fixes are coming soon.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 0 costs, 1 mixed.
NHTSA Denies Defect Petition for 2023 GLC300
On January 16, 2025, NHTSA denied petition DP23-003 (filed July 2, 2023) asking for an investigation into alleged defects in the ISG 48-volt system on Model Year 2023 Mercedes‑Benz GLC300 vehicles. NHTSA concluded the issues raised do not warrant opening a defect investigation at this time.
Manufacturer Service Campaign for CPC Software
Mercedes‑Benz reported to NHTSA that the condition described by the petitioner was caused by a software deviation in the Central Powertrain Controller (CPC) and that Mercedes‑Benz has an active service campaign to correct the CPC software deviation. NHTSA noted the CPC is separate from the 48‑volt ISG system and the CPC issue may cause intermittent no‑start conditions occurring at vehicle startup.
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