21 22 23 Toyota Tacoma 3.5L V6 Engine Computer Module ECU ECM OEM 89661-04L91

This part number (89661-04L91) is for the Engine Control Module (ECM/ECU) for the 2021–2023 Toyota Tacoma. It is the primary engine computer for models equipped with the 3.5L V6 (2GR-FKS) engine and an automatic transmission.

Title 

2021-2023 Toyota Tacoma 3.5L V6 Engine Computer ECU ECM OEM 89661-04L91

Description

Product Overview

Up for sale is a genuine OEM Toyota Tacoma Engine Control Module. This is the factory "Brain Box" that manages fuel injection, ignition timing, and transmission shifting for the 3.5L V6 powertrain.

• Manufacturer: Denso / Toyota

• Part Number: 89661-04L91 (8966104L91)

• Superseded By: 89661-04L92 (Newer version)

• Replaces: 89661-04L90

• Engine: 3.5L V6 (2GR-FKS)

Condition Report

• Hardware: Professionally inspected. All plastic multi-pin connectors are intact with no chipped edges or bent pins.

• Electronics: Pulled from a fully operational donor vehicle. No history of "short to ground" issues or water damage.

• Casing: The metal housing is clean and free of corrosion.

Vehicle Compatibility

Fits the following Third Generation Toyota Tacoma models:

• Years: 2021, 2022, 2023

• Trims: SR, SR5, TRD Sport, TRD Off-Road, Limited, and TRD Pro.

• Drive Type: 4x2 and 4x4.

• Important: Specifically for vehicles with Automatic Transmission.

⚠️ Important Tech Note for Buyers

• Programming Required: This is a high-security component part of the Toyota Immobilizer system. After physical installation, the unit MUST be programmed to your VIN and the keys must be re-synced using a Toyota Techstream (GTS) tool or by an experienced automotive locksmith. It is not plug-and-play.

• Diagnostic Tip: If your Tacoma is "cranking but not starting" or has "no communication" with the scanner, verify your wiring harness and fuses first, as these computers are designed to shut down if they detect an external short.

Item Specifics

• Brand: Toyota / Denso

• Manufacturer Part Number: 89661-04L91

• Other Part Number: 89661-04L92 / 8966104L91

• Placement on Vehicle: Front (Right Hand Dash area)

• Fitment Type: Direct Replacement (Requires Programming)