Repair service for the ECM computer (Engine Control Module) of the 2001, 2002, and 2003 Toyota Highlander. We fix common automatic transmission issues caused by the ECM.
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.
This ECM module controls the engine and the automatic transmission of your Toyota Highlander. Our professional solution is backed by a 5 years warranty.
FREE USPS Priority Mail shipping (3-5 business days) is offered to all 48 U.S. states, Hawaii, Alaska, Puerto Rico, the U.S. Virgin Islands, Guam, and American Samoa. For faster (paid) shipping, use our shipping rate calculator, available when you add this service to your cart.
Why send it to us?
We offer the most complete service for these units and go further than our competitors to ensure you have the best experience with us and that this issue does not happen again to your ECM.
We not only fix the problem, but also check the entire ECM circuit to prevent other minor issues, whether related to the original issue or not. If the ECM firmware (calibration) is outdated, we will install the latest update available from Toyota for your specific ECM.
How does it work?
After you complete the order, you will need to disconnect and remove your ECM from your vehicle and mail it to our location. We repair, rebuild, and reprogram the ECM, then ship it back to you.
Common Symptoms
- Hesitation or harsh shifting, especially in 3rd gear
- Shifting erratically
- Harsh engagement in reverse, often slamming into gear
- Sometimes it feels like it is braking by itself
- One day, it magically works ok, and the other day, all the issues are back
- Issues show up only when cold or only when hot
- When stopping at a red traffic light and starting to move again, it feels very heavy or sluggish
- In many cases, the check engine light does not turn on (no codes)
Models Affected
2001, 2002, and 2003 Toyota Highlander, either 4WD (4×4) or 2WD (4×2), and either the 4-cylinder or 6-cylinder models.
Servicing the ECM on these models should be treated with urgency to avoid damaging the automatic transmission once symptoms start showing.
Partial List of Involved Part Numbers
| 89661-48230 | 89661-48231 | 89661-48240 | 89661-48241 | 89661-48250 | 89661-48251 |
| 89661-48260 | 89661-48290 | 89661-48350 | 89661-48360 | 89661-48370 | 89661-48380 |
| 89661-48410 | 89661-48420 | 89661-48430 | 89661-48431 | 89661-48440 | 89661-48441 |
ECM Location
The picture below shows the location of the ECM in the 2001, 2002, and 2003 Toyota Highlander:

Warranty
A 5 years warranty is included.
Turnaround Time
Our TAT is only one business day.
TAGS: toyota highlander ecm ecu repair service



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