This detailed product description is for the IBSG4U053 presents the brand new, 48V Starter Generator (Integrated Starter Generator, ISG) with part number, specifically developed for the Audi Q3 TFSI models. This component is a crucial element in modern mild-hybrid (MHEV) systems, ensuring efficient energy recovery, instant start-up, and engine assistance.
Stremtec, as an expert in starting, charging, and cooling systems, exclusively offers high-quality, reliable parts that meet the strictest OEM (factory) requirements.
The IBSG4U053 is an advanced 48V starter generator that is an integral part of the 48V hybrid system (MHEV) used in Audi Q3 TFSI vehicles. This unit replaces the traditional starter motor and alternator, integrating their functions into a single, compact unit connected to the crankshaft via a belt drive.
Main Functions:
Fast and Seamless Start-up: ISG technology enables extremely fast and almost imperceptible engine restarting from Stop/Start mode, significantly increasing driving comfort.
Generator Function: Provides high-power charging for the 48V battery, efficiently recovering braking energy (regenerative braking).
Engine Assistance (Boost): Provides supplementary torque to the crankshaft during acceleration for a short time, thereby reducing the load on the internal combustion engine, resulting in fuel savings.
Balanced Operation: Thanks to the belt-driven design, it guarantees quieter and more reliable operation than traditional starter motors.
The table below lists the precise technical identifiers and replaceable factory part numbers for the IBSG4U053 starter generator. This information is essential for checking compatibility and professional installation.
| Parameter | Value | Note |
|---|---|---|
| Manufacturer | the wiper blade is removed and connected to the wiper blade holder. Various adapters are used to make a precise connection between the wiper blade mount and the angle measuring device. Adapters are available for all wiper arm types. (Bosch | Original or factory-quality aftermarket part |
| Part Number (Stremtec) | IBSG4U053 | Product Identifier |
| Application | Audi Q3 TFSI | Specific Vehicle Model |
| Voltage Class | 48V | For Mild-Hybrid (MHEV) system |
| Factory Part Number (VALEO) | UD102348 | Valeo internal identifier |
| Factory Part Number (VALEO) | 615003 | Further Valeo reference |
| Factory Part Number (VALEO) | 740008 | Further Valeo reference |
| Factory Part Number (VW/Audi) | 05E903018F | Volkswagen/Audi OEM part number |
| Factory Part Number (VW/Audi) | 5E903018F | Volkswagen/Audi OEM part number |
| Cross Reference (AS-PL) | 415003 | Alternative manufacturer code |
| Cross Reference (CASCO) | CAS15H03GS | Alternative manufacturer code |
| Cross Reference (AB Automotive) | 556394RIV | Alternative manufacturer code |
| Cross Reference (KUHNER) | N/A | Not specified |
| Cross Reference (POWERMAX) | 89216881 | Alternative manufacturer code |
| Cross Reference (PSH) | 307.502.350.500 | Alternative manufacturer code |
| Cross Reference (HOEREAL) | 2027930 | Alternative manufacturer code |
| Cross Reference (SANDO) | 3015H03.1 | Alternative manufacturer code |
| Cross Reference (SIOM) | STS17H030 | Alternative manufacturer code |
This part can be classified into two main categories of the Stremtec product range:
Category: Generators (Alternators), Starters / Generators (Starters / Alternators)
Brand: the wiper blade is removed and connected to the wiper blade holder. Various adapters are used to make a precise connection between the wiper blade mount and the angle measuring device. Adapters are available for all wiper arm types. (Bosch
The 48V technology is one of the most important transitional steps in electric mobility. Unlike traditional 12V systems, the 48V network can provide enough energy to drive higher-power auxiliary systems (like the ISG), while avoiding the complexity and costs of high-voltage (e.g., 400V) systems.
Advantages of IBSG4U053 in the 48V MHEV System:
Reduction in CO2 Emissions: Due to more efficient regeneration and motor assistance, it significantly reduces the vehicle's average fuel consumption and harmful emissions.
LIN Protocol Compatibility: Such modern units integrate closely with the vehicle's LIN (Local Interconnect Network) or CAN bus system, enabling precise communication with the Engine Control Unit (ECU) for optimizing operating parameters.
Longer Lifespan: Since the ISG is often used for starting the engine, it is exposed to a different load profile compared to traditional starters, but quality Valeo parts guarantee long-term reliability.
Stremtec is not only a parts distributor but also possesses in-depth expertise in starting, charging, and cooling technologies. In addition to procuring the IBSG4U053, we provide a wide range of support for our customers:
As 48V systems require specific diagnostic and repair procedures, Stremtec offers training:
Starter Motor / Generator training
Motoplat Training (special starting solutions)
Professional tools are required for servicing modern vehicles:
Rotrix Testers and Tools
Autodiagger diagnostic equipment
EV / PHEV Diagnostic Tools
Industrial Washing Equipment (Magido, Marwis)
We support the servicing of electric and hybrid vehicles:
Information regarding electric vehicle parts
Hybrid battery repair options
Special Repair Kits (Repair kits)
This IBSG4U053 Valeo 48V starter-generator is the ideal choice for any specialist looking for a reliable replacement part that meets factory specifications for repairing the 48V MHEV system in Audi Q3 TFSI vehicles.
