# 22256346 Control Unit | Genuine Volvo Penta Part

## 🔧 Product Description

Unprogrammed EDC IV control unit for TAD520GE and related TAD530GE electrical systems. On the TAD520GE it applies from serial 10954523 onward, is supplied without a high-altitude sensor and requires Volvo Penta VODIA programming.

## 🚤 Compatibility

-   **Engine Family:** TD, TAD
-   **Serial Range:** SN10954523-, Without high altitude sensor, no software, to be programmed by customer using Vodia

Full model list at the end of this description.

## ⚙️ Key Features

-   EDC IV diesel-control hardware
-   Confirmed TAD520GE and TAD530GE application
-   TAD520GE fitment from SN10954523
-   Supplied without software
-   VODIA programming required
-   Engine type: 4-cylinder turbocharged generator/industrial diesel

## 🔌 Function

Controls fuel delivery, engine speed, protection functions and diagnostics from sensor and operator inputs.

## ⚠️ Common Signs of Failure

-   No start or no injector command
-   Loss of diagnostic communication
-   Unexpected derate or shutdown
-   Internal control-unit fault
-   Water or corrosion damage at connectors

## 🛠️ Service Notes

-   A replacement control unit normally has to be loaded with the software and parameter set for your engine and installation before it will run — that is authorised-dealer work with Volvo Penta's own diagnostic tool, so plan the job around it rather than around the fitting time
-   Isolate the batteries at the main switches and leave the system dead before disconnecting or connecting anything; back-feeding a live bus through a half-mated connector is a common way to destroy a new unit
-   Treat the unit as static-sensitive and mechanically delicate: handle it by its housing, leave it in its packaging until it is going on, and never weld on the boat with control units connected
-   Mate connectors clean and dry and push them fully home until the lock engages, then refit the harness clips and any shielding so the loom is not left hanging on the plugs
-   Mount it in its own bracket and original orientation so the cable entries face as designed and water runs away from the connectors rather than into them

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   22256346 → Supersedes 21632128 → Supersedes 20845001 → Supersedes 20556508

### OEM / Related Numbers

-   21632128 earlier number superseded by this part
-   20845001 earlier number superseded by this part
-   20556508 earlier number superseded by this part
-   3586271 (related EDC IV control-unit references)
-   3586270 (related EDC IV control-unit references)
-   20844999 (related EDC IV control-unit references)
-   22347693 (related EDC IV control-unit references)
-   20585159 (related wiring harnesses)
-   20585162 (related wiring harnesses)
-   20555343 (related wiring harnesses)

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta TAD520GE, TAD520VE
-   Volvo Penta TAD530GE MECH, TAD530GE EDC4
-   Volvo Penta TAD531GE MECH, TAD531GE EDC4
-   Volvo Penta TAD720GE, TAD720VE
-   Volvo Penta TAD721GE, TAD721VE
-   Volvo Penta TAD722GE, TAD722VE
-   Volvo Penta TAD730GE MECH, TAD730GE EDC4
-   Volvo Penta TAD731GE MECH, TAD731GE EDC4
-   Volvo Penta TAD532GE EDC4
-   Volvo Penta TAD620VE
-   Volvo Penta TAD732GE EDC4
-   Volvo Penta TAD733GE EDC4
-   Volvo Penta TD520GE
-   Volvo Penta TD720GE

## Details

- **Price:** 4914.99 AUD
- **Vendor:** Volvo Penta
- **Type:** Ignition & Controls
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 4914.99 AUD | In stock |

## Images

- 22256346 Control Unit | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/22256346-control-unit-genuine-volvo-penta)
> Updated: 2026-10-12