or four payments of $284.56
with 
Learn More
Information
4N1903028 4N0903028P Mild Hybrid IGBT Generator Computer Version for AUDI Q8 Q7 A6 A7 A8 Q5
Remanufactured 48V Alternator Generator Control Board 4N1903028 4N0903028P 4N0903028 For Audi A6 A7 A8 Q7 Q8 S6 S8
Associated Numbers
4N1903028 4N0903028P 4N0903028 4N1-903-028
Back plate 4N1903028 4N0903028
Suitable Audi A8 A6 A7 Q7 Q8 RS6 Generator Computer Board
OEM's
- 4N0903028P
- 4N0903028J
- 4N0903038J
- 4N0903028R
- 4N0903028N
- 4N0903028PX
- 4N0903028H
- 4N0903028M
- 4N0903028Q
- 4N1903028A
- 4N0903028D
Specifications
Check Critical Notes Tab
| Voltage | 48 V |
< Critical Notes >
We are pleased to announce that our company is the first to offer aftermarket replacement parts for the Audi Electric Generator IGBT. This component is the primary reason these units fail, and we are excited to provide a reliable solution.
To ensure a successful repair and protect the longevity of the generator, please follow these critical precautions:
1. Battery Requirements
The 48V lithium battery must be charged to approximately 70% capacity (49.5V) before attempting to start the vehicle. Starting the car with low voltage can cause significant damage to the generator.
2. Antifreeze Filling Method
You must use the vacuum filling method for the antifreeze. Standard filling followed by computer-assisted air bleeding only clears the engine; it does not remove air from the generator’s water channel. Resulting poor heat dissipation will significantly shorten the life of the generator, especially when installing a new IGBT set. Failure to fill the antifreeze properly may necessitate the replacement of all components.
Common Faults and Diagnostics
The Audi starter-generator (often referred to as the "mild-hybrid disaster") frequently fails due to electrical boards and contacts breaking down. While moisture is often cited as the cause, the actual issue is typically high operating currents causing the power transistors to overheat and the power board to fail.
Drivers may see general dashboard warnings regarding the electrical mains, Start-Stop system, or brake power booster. Specific diagnostic error codes to look for include:
- P065C00: Alternator mechanical characteristics - Intermittent operation
- U046900: Starter generator control unit, invalid signal
- P0CA700: Hybrid drive battery, discharge current too high
Please note that a failed alternator often completely drains the 48-volt battery, causing it to enter protection mode. In these cases, the car will be immobilized, and you must use ODIS or similarly capable scan tools to remove the protection even after installing a new alternator.
View your shopping basket or Browse other items in Regulator.