

What is the Volvo Penta MDI Unit?
The MDI unit is an electronic module that processes engine signals and communicates them to your boat’s control and monitoring systems. It receives data from engine sensors and switches and transmits it to control panels and displays. This provides insights into vital engine functions like RPM, oil pressure, engine temperature, and more. The MDI also helps diagnose engine problems by reading error codes.
Symptoms of a Faulty MDI Unit

Part Numbers: MDI Variants and Replacements
Although part number 23231607 is the most commonly used and most recent number for the Volvo Penta MDI unit, there are a few other relevant part numbers you should be aware of. These may vary depending on your engine model or the specifications of your vessel.
However, these older numbers are still often in circulation — do not buy them! They come with many issues and have a high risk of failure within a short period of time!
Here are the key Volvo Penta MDI part numbers:
- This is the standard part number for the MDI unit. It is used in many of the popular Volvo Penta D-series engines, such as the Volvo Penta D1 and D2 series.
- An alternative version of the MDI unit, compatible with other Volvo Penta engine series.
- An older version of the MDI unit, still in circulation but often replaced by newer models like 23231607.
It is important to check which part number is compatible with your specific engine. However, the most common replacement is part number 23231607, which in most cases is suitable for a wide range of Volvo Penta engines.
Not sure which one you need? Feel free to contact us!
Which MDI Unit Should You Buy?

Need help? Call or email us — we’ll gladly assist you by phone.