BMW 3 Series G20/G21 B47 Diesel Models
This page covers the BMW 318d and 320d from the G20/G21 3 Series generation, built approximately 2019–present. Every variant on this page uses the B47, a 2.0L turbocharged diesel inline-four engine. Covered body styles are Sedan and Touring. Depending on the variant, it was offered with rear-wheel drive or xDrive all-wheel drive, paired with a manual gearbox or an automatic gearbox. Engine management is by a BMW DDE; identify the exact ECU hardware and software from the vehicle before ordering a file.
Model & Generation Context
Engine family
B47
Exact revision is production-date and vehicle-specific
Displacement
2.0L
Production
c. 2019–present
Approximate; confirm the build date from the vehicle
Fuel Type
Diesel
Supported Model Variants
BMW 318d
Engine: B47
Production: c. 2019–present
Chassis: G20, G21 · Sedan, Touring
Drivetrain: RWD, xDrive
BMW 320d
Engine: B47
Production: c. 2019–present
Chassis: G20, G21 · Sedan, Touring
Drivetrain: RWD, xDrive
Engine Platform
ECU & Transmission Context
BMW DDE — identify from vehicle
Read the ECU hardware and software numbers from the vehicle before ordering a file.
Manual gearbox
Gearbox specification is vehicle-specific; confirm it from the vehicle order data.
Automatic gearbox
Gearbox specification is vehicle-specific; confirm it from the vehicle order data.
Identification & Pre-Tuning Checks
- Confirm the engine code on the vehicle matches the B47 before ordering a file.
- The exact engine revision is production-date and vehicle-specific; it is not inferred from the model name.
- Identify the BMW DDE and its exact hardware and software version from the vehicle; it is not inferred from the model name.
- Scan for stored fault codes and resolve existing issues before any calibration work.
- Check the condition of the DPF, EGR system and, where fitted, the AdBlue (SCR) system.
- Gearbox type varies on this model; note whether the car is manual or automatic when submitting a file.
Available Service Paths
Custom Calibration and Datalog Review
Submit datalogs and vehicle configuration for a fully custom calibration review tailored to your specific setup.
Request a Custom CalibrationECU Read and Support Check
Verify your ECU hardware and software version is supported before starting a calibration project.
Check ECU SupportTCU Calibration Assessment
Assess transmission control unit compatibility and calibration options for your vehicle and gearbox configuration.
Request a TCU FileStage 1 Torque and Efficiency Calibration
A vehicle-specific diesel calibration focused on torque delivery, fuel efficiency and drivability on standard hardware.
Request a Stage 1 FileDPF Diagnostic and Regeneration Assessment
Diagnose DPF health, regeneration behaviour and fault-code context. Supports repair, regeneration and compliant maintenance.
Request Diagnostic ReviewEGR System Diagnosis
Assess EGR valve condition, fault codes and system health to support repair and compliant maintenance decisions.
Request Diagnostic ReviewAdBlue / SCR / NOx Diagnostic Assessment
Diagnose AdBlue dosing, SCR catalyst and NOx sensor faults to support compliant repair and system restoration.
Request Diagnostic ReviewRelated Resources
BMW B47 File Service
Order a file for your BMW 3 Series
Prepare the original ECU file, vehicle details, fuel and hardware setup before opening a file request.
Open File Service PortalOriginal ECU File
Read via OBD, Bench or Boot
Vehicle Details
Model, year and specification
Fuel Information
Fuel type and octane rating
ECU Identification
Hardware and software version