Engine Module 21300122 for Volvo FH, FM, B11R, B13R, FH4, FM4 Trucks & Buses (2013–2024)Product Overview Part Name: Engine Control Module (ECM) Part Number: 21300122 Vehicle Compatibility: Engineered for Volvo FH & FM heavy duty trucks, B11R B13R long distance buses, and FH4 FM4 Euro 4Euro 6 platforms, model years 20132024. Configuration: Robust electronic control module responsible for precise engine management, injection timing, turbocharger control, emissions monitoring, and onboard diagnostics. Function: Improves fuel efficiency,