Volvo Penta Trim Sensor 3594989 SX-C / SX-M / DP-S Transom

Volvo Penta 3594989 is a genuine OEM sensor used in select Volvo Penta sterndrive transom assemblies. Current parts references place this part directly in the TSK SX-C1AC / Marine Propulsion schematic, where it is identified as a 2-wire sensor in the transom-shield and trim-sender area. Stronger application listings also describe it as a 2-wire trim sending unit used on specific SX and TSK transom assemblies.

Key Features

• Genuine Volvo Penta OEM part number 3594989
• Identified in current Volvo Penta references as a sensor, schematic object key 74
• Current schematic detail describes it as a 2-wire sensor
• Strongest application detail identifies it as a trim sending unit
• Dealer weight reference lists it at approximately 0.190 kg

Engine Compatibility

The strongest supportable fitment for 3594989 is by drive and transom assembly rather than by engine long-block. Current public references connect it to TSK SX-C, TSK SX-C1, TSK SX-C1AC, TSK SX-C2AC, TSK SX-CLT M10, TSK SX-CLT1, TSK SX-M, TSK SX-MAC, TSK SX-MACLT, TSK SX-MBAC, TSK SX-MDA, TSK SX-MDB, and TSK SX-MDC. Additional trim-sender references also associate it with SX-C, SX-C1, SX-C2, SX-M, DP-S, and DP-SM transom assemblies. Because trim-sender fitment can vary by transom generation and model year, the safest fitment path is to match this sensor to the exact Volvo Penta transom schematic and serial-number-based application before ordering.

Serial Number Fitment Notice

Match Volvo Penta part number 3594989 to your drive serial number and the correct Volvo Penta trim or transom diagram before ordering. Trim sensors can share similar housings while serving different calibration ranges or assembly generations, so exact application matters more than appearance alone.

When This Part Needs Replacement

This sensor should be replaced when trim indication becomes inaccurate, trim signal is intermittent, the sensor body or wiring is damaged, or corrosion affects reliable sender output. It is also worth checking anytime the transom shield, trim harness, or nearby sender hardware is already apart. This service guidance is a practical inference based on the part being identified as a 2-wire trim sending unit in transom-shield applications.

Installation Notes

Confirm the exact application before installation, and compare the removed sensor carefully against the replacement part, especially the 2-wire configuration and harness routing. Current aftermarket cross-reference references also note that this style is used on certain earlier SX-C and SX-M era assemblies and is not the same as later SX-A style trim sensors, which makes exact matching especially important.

Alternate/Superseded Part Numbers

Current cross-reference sources associate 3594989 with related reference numbers 3854842, 3861837, and 3863129 in similar trim-sender applications. Those are useful comparison numbers when checking older hardware or catalogs, but final fitment should still be confirmed by the exact transom assembly.

Parts Desk Insight

With trim sensors like this, the easy mistake is matching only by connector style. Checking the exact transom assembly first usually saves time, especially when earlier SX-C and SX-M era sender hardware can look close to other Volvo Penta trim sensors but fit a different generation.

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