Fitment notes: OEM size: 12V 12Ah AGM auxiliary battery (Mercedes-Benz aux/backup type, e.g. A000982xx08 / AUX-class) · Location: Separate from the main 12V AGM starter battery — typically in the engine bay under the cowl area (some CLE variants route it behind rear side trim); exact placement not confirmed · Purpose: On-board voltage support/stabilization during ISG (integrated starter-generator) start-stop restarts and backup power for safety-critical control units and electronics
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Every control module on the 2025 Mercedes-Benz CLE450 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Integrated Starter Generator Control Unit (ISG)4.5 hr R&Rsecurity gateway +1.2 hr▸ programming details
📍 Engine, integrated with crankshaft
🔧 Xentry Diagnostics + SCN online
⚠️ 48V mild hybrid starter/generator. Engine removal required for replacement. High voltage disconnect mandatory.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +1.2 hr▸ programming details
⚠️ Memory seats, heating, ventilation. Seat position calibration required.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2025 Mercedes-Benz CLE450 3.0L I6 Turbo Hybrid and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.