# 873785 Electronic Unit | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta electronic unit for engines from serial number 1101053655 onwards, from the Instruments group. It weighs 0.566 kg and is listed for 19 applications across the TMD and TAMD ranges. It consolidates four earlier numbers — 843307, 846697, 862753 and 862935 — which earlier records list as a circuit board and as alarm panels.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TMD102A
-   Volvo Penta TMD121C
-   Volvo Penta TMD122A
-   Volvo Penta TAMD162C-C
-   Volvo Penta TAMD102A
-   Volvo Penta TAMD103A
-   Volvo Penta TAMD121D
-   Volvo Penta TAMD122A
-   Volvo Penta TAMD122D
-   Volvo Penta TAMD122P-A
-   Volvo Penta TAMD122P-B
-   Volvo Penta TAMD122P-C
-   Volvo Penta TAMD162A
-   Volvo Penta TAMD162C
-   Volvo Penta TAMD162C-B
-   Volvo Penta TAMD74A
-   Volvo Penta TAMD163A-A
-   Volvo Penta TAMD165A
-   Volvo Penta TAMD165C

-   **Engine Family:** TMD, TAMD
-   **Serial Range:** SN1101053655/XXXXX-

## ⚙️ Key Features

-   For engines from serial number 1101053655 onwards
-   0.566 kg
-   Listed for 19 applications
-   Covers TMD and TAMD engines
-   Replaces 843307, 846697, 862753 and 862935, catalogued earlier as a circuit board and as alarm panels
-   Also supersedes Volvo part numbers 846696, 862739 and 863352

## 🔌 Function

Drives the alarm and warning functions of the panel, taking the signals from the engine senders and turning them into the warnings the operator sees and hears.

## ⚠️ Common Signs of Failure

-   Alarm sounding with no fault present
-   Alarm failing to prove on the pre-start test
-   Warning lamps lighting at random or staying on
-   Buzzer weak, distorted or silent
-   Damp, corrosion or scorch marks inside the unit

## 🛠️ Service Notes

-   Check the engine serial number is 1101053655 or later before ordering
-   Prove the senders and their wiring before replacing the unit — a shorted sender lead lights the same lamp
-   The alarm system is a safety function: do not run the engine with it disabled

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   873785 → Supersedes 843307

### OEM / Related Numbers

-   846697 earlier number superseded by this part
-   862753 earlier number superseded by this part
-   862935 earlier number superseded by this part
-   843307 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 5699.29 AUD
- **Vendor:** Volvo Penta
- **Type:** Instruments & Gauges
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 5699.29 AUD | In stock |

## Images

- 873785 Electronic Unit | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/873785-electronic-unit-genuine-volvo-penta)
> Updated: 2026-09-18