# 3840321 Control Unit | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta PCU control unit from the Ignition and Control Systems group, weighing 1.399 kg and listed for 40 applications on D series engines. Software is ordered separately or downloaded with Vodia, so the unit arrives without the configuration your engine needs. It supersedes part number 3589079.

## 🚤 Compatibility

-   **Engine Family:** D
-   **HP Range:** 180-370 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   PCU
-   Software ordered separately or downloaded with Vodia
-   1.399 kg
-   40 applications on D series engines
-   Supersedes 3589079

## 🔌 Function

Acts as the powertrain control unit, reading the engine sensors and commanding fuelling and protection functions.

## ⚠️ Common Signs of Failure

-   Engine will not start, or shuts down and derates without a clear cause
-   Fault lamps lit and multiple sensor faults logged at once
-   Loss of communication with the display or diagnostic tool
-   Water tracks, salt or corrosion inside the connector
-   Unit unresponsive with power and earth both proven good

## 🛠️ Service Notes

-   Budget for the software as a separate item - the unit is not usable until it is loaded with Vodia
-   Prove supply, earth and connector pins before replacing, as harness faults look identical
-   SHCU 3840354 is the other control unit in this family and is not interchangeable

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3840321 → Supersedes 3589079

### OEM / Related Numbers

-   3589079 earlier number superseded by this part

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D6-350A-A, D6-350A-B, D6-370D-B, D6-370D-A, D6-310I-B, D6-280I-B, D6-280I-A, D6-310I-A, D6-310D-B, D6-370I-A, D6-370I-B, D6-310A-B, D6-310A-A, D6-280A-A, D6-280A-B, D6-370A-B
-   Volvo Penta D4-260A-B, D4-260A-A, D4-260D-B, D4-260I-A, D4-260I-B, D4-210A-A, D4-210A-B, D4-225A-B, D4-210I-A, D4-210I-B, D4-180I-B, D4-225I-B
-   Volvo Penta D9A2J, D9A2G, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2A, D9A2C, D9A2E
-   Volvo Penta D12D-B MP
-   Volvo Penta D16C-A MH

## Details

- **Price:** 4027.85 AUD
- **Vendor:** Volvo Penta
- **Type:** Ignition & Controls
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 4027.85 AUD | In stock |

## Images

- 3840321 Control Unit | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3840321-control-unit-genuine-volvo-penta)
> Updated: 2026-10-08