Of course, this is a maximum. It may, and usually does, take less than this time.
Engine Control Module (ECM/ECU) for 2005 Toyota Sienna FWD with the 1MZ-FE, 3.3L V6 3MZ-FE engine, and automatic transmission (A/T). This ECM was refurbished and tested.
We will program your car’s VIN before shipping if you include it when ordering this ECM. We provide a form at checkout to enter your car’s VIN.
Part Number
89661-08120
Exchange Part Number
89661-08120
89661-08120 84
590-60816 (Hollander)
PROGRAMMING
We will program your car’s VIN, but the ECM will also need your keys programmed into it. Otherwise, the car will not start. You may either: (1) bring your car with the ECM to a locksmith, or (2) follow an easy and simple process described in this link for adapting the immobilizer system of the ECM to the immobilizer system of your car.
The transmission adaptive system memory was also reset, so it starts relearning from zero when the ECM is installed, ensuring smooth shifting in the automatic transmission.
WHY BUY FROM US
We offer quality items backed by a great warranty. These ECMs are offered on many marketplaces, but they are not tested or programmed for your car. You will get the best value on these ECMs when you buy from us.
IDENTIFYING THE PART NUMBER
Your ECM part number is on the label at the top of the ECM. An example is shown below. In this example, the part number is “89661-08120”


Please, before ordering, make sure your ECM part number matches one of the exchange part numbers listed above on this page, which are 100% compatible.
Model Covered
2005 Toyota Siena 3.3L, 6-Cylinders, 2WD 3MZ-FE engine, Automatic (A/T) transmission.
Possible Symptoms
A bad ECM in the 2005 Toyota Sienna may cause any of numerous symptoms, but the most common are:
- The engine won’t start
- Transmission harsh shifting problems
- May give several error codes while all sensors check good
- Harsh engagement when put in reverse.
- Very bad engine performance
ECM Location:
The 2005 Toyota Sienna engine ECM is located behind the glove compartment, in the right-hand area, as shown below.

Notes referring to common questions we receive
- This is a direct replacement for the 2005 Toyota Sienna ECM for the V6, 2WD, 3.3L models.
- ECM (Engine Control Module) and ECU (Engine Control Unit) refer to the same part.
- The warranty of this unit is specified at the top of this page.
- We ship via USPS and FedEx.
- We ship to PO Boxes and APO Boxes (military).
- Shipping to the USA via USPS Priority Mail is FREE.
- If you include your VIN when ordering, we will program it at no extra cost.
- When installing, it is a good idea to disconnect the vehicle battery, but it is not a must.
- No core charges. You do not need to send back your old ECM as a core.
- You will need to have it programmed. You may also do the sync process, explained HERE, to make the ECM start your car.
This is a refurbished product. It has been put back to factory functioning conditions and has been tested and made sure that it works as new. In addition, a reasonable warranty has been included for the peace of mind of our customers.
Some images shown here will be for the only purpose of identifying the product, while in some other cases, the images are the actual product images. That been said, the product you receive may vary slightly from the images shown here. Nevertheless, we always pick the best and cleanest one we have available at the moment of shipping your order :)
TAGS: 89661 08120, 8966108120, toyota sienna ecm ecu




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