Fitment notes: AGM battery required; located in trunk on right side
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Every control module on the 2020-2026 Mercedes-Benz CLA — 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.
Transmission Control Unit (TCU)3.5 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Transmission bell housing or valve body (internal)
🔧 Xentry with MBD account
⚠️ Requires transmission fluid drain and valve body removal. Enhanced security requires online authorization.
Electric Power Steering Control Unit (EPS)2.0 hr R&Rsecurity gateway +0.8 hr▸ programming details
📍 Steering column or rack assembly
🔧 Xentry with MBD account
⚠️ Requires steering angle sensor calibration and online authorization.
Electronic Stability Program Control Unit (ESP/ABS)1.5 hr R&Rsecurity gateway +0.8 hr▸ programming details
📍 Engine bay, left front near brake master cylinder
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 CLA 2.0L Turbo I4 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.