This is a repair-and-return service for your 2007-2010 Toyota Sienna ECM that is having issues with the automatic transmission.
If you own a 2007-2010 Toyota Sienna (3.5L, V6), you may experience harsh shifting, among other symptoms, that are caused by a failing ECM or ECU.
IMPORTANT:
#1: This is a repair-and-return service. This is not a replacement part. You send us your defective part, we repair it, and we ship it back to you, working like new.
#2: Shipping, including the FREE shipping option, is for returning your unit after it is repaired (outbound shipping). It does not refer to inbound shipping.
If you are experiencing issues with your Sienna’s transmission, DO NOT postpone fixing this problem. Doing so may cause damage to the transmission. Now is the time to service your ECM before it is too late.
Possible symptoms
- Hesitation or harsh shifting, mostly from 2nd gear to 3rd gear.
- Slams into gear or makes noises when shifting into reverse.
- Sometimes the vehicle feels like it’s braking on its own.
- Erratic shifting at intermittent intervals.
- Rattling or clicking noise from the engine area when the engine is running, even in neutral or Park.
- Some days it fails, and some other days it works with no issues.
- The problem shows only when warm, only when cold, or only when first used in the day.
- After a complete stop, the moment you start moving again, it feels like towing a heavy load.
- Lower fuel economy than normal (consumes more gas than usual).
Part numbers affected
This is a partial list of affected ECM part numbers. If you don’t see your ECM number in the table below, please contact us for confirmation.
| 89661-08170 | 89661-08180 | 89661-08240 | 89661-08250 |
| 89661-08270 | 89661-08271 | 89661-08280 | 89661-08281 |
| 590-51310B |
Covered Car Models (fitment)
- 2007 Toyota Sienna CE, 3.5L 4-Door
- 2007 Toyota Sienna CE, 3.5L 5-Door
- 2007 Toyota Sienna LE, 3.5L 4-Door
- 2007 Toyota Sienna LE, 3.5L 5-Door
- 2007 Toyota Sienna XLE, 3.5L 4-Door
- 2007 Toyota Sienna XLE, 3.5L 5-Door
- 2008 Toyota Sienna CE, 3.5L 4-Door
- 2008 Toyota Sienna CE, 3.5L 5-Door
- 2008 Toyota Sienna LE, 3.5L 4-Door
- 2008 Toyota Sienna LE, 3.5L 5-Door
- 2008 Toyota Sienna XLE, 3.5L 4-Door
- 2008 Toyota Sienna XLE, 3.5L 5-Door
- 2009 Toyota Sienna CE, 3.5L 4-Door
- 2009 Toyota Sienna CE, 3.5L 5-Door
- 2009 Toyota Sienna LE, 3.5L 4-Door
- 2009 Toyota Sienna LE, 3.5L 5-Door
- 2009 Toyota Sienna XLE, 3.5L 4-Door
- 2009 Toyota Sienna XLE, 3.5L 5-Door
- 2010 Toyota Sienna CE, 3.5L 4-Door
- 2010 Toyota Sienna CE, 3.5L 5-Door
- 2010 Toyota Sienna LE, 3.5L 4-Door
- 2010 Toyota Sienna LE, 3.5L 5-Door
- 2010 Toyota Sienna XLE, 3.5L 4-Door
- 2010 Toyota Sienna XLE, 3.5L 5-Door
- 2007-2010 Toyota Sienna Limited 3.5L
After you reinstall your ECM, NO PROGRAMMING will be needed.
ECM Location

*** IMPORTANT NOTE ***
If your Sienna does not engage in reverse at all, the ECM is undoubtedly damaged, but the damage went beyond the ECM and into the transmission. The ECM controls all the forward gears (1st, 2nd, 3rd, and 4th), but it does not control the reverse. The reverse is purely mechanical. Even when it is sometimes affected by a damaged ECM, like bumping into gear when you put it in reverse, it is not controlled at all by the ECM. That means the ECM must be repaired, and so must the transmission. A repaired ECM must be in place in order to avoid damaging a repaired or replaced transmission. In these cases, repairing your ECM is still always the first step.
TAGS: sienna ecu repair service, toyota sienna ecm ecu repair service



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