Skip the auto shop - Our mechanics make house calls

Q: Swaped used ecm for original, sienna will not start, do I need to take it to the dealer to reprogram?

asked by on

2004 Sienna. Rat chewed wire from sensor plug #1. Following steps from a mechanic I fixed the wires, traced the wire to the ecm and the ecm was not sending signal to the sensor. Had a missfire cylinder code on #1. Bought a used ecm, identical, same part number. Swaped ecm with battery unhooked, hooked battery turn the key for 5min. Tryed it and will not start, it will crank and try to start but it dies. Do I need to take it to the dealer to reprogram or is there something else I could try? Thank you

A: You may not be able to have the ECM you pur...

You may not be able to have the ECM you purchased used reprogrammed. You would need to check with a dealer. Some cannot be swapped from one vehicle to another. They function this way so that parts could not be stolen and reused. Check to see if the dealer can do the reprogram on this one. It will not start until this is done. If you’d like a second opinion on this, consider YourMechanic, as a certified technician can diagnose your starting issue firsthand and suggest what to do from there.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Slip indicator light flashing on and brakes lock up while driving what's wrong

Hello. From what you describe, it would appear that your vehicle may be experiencing some sort of issue with the traction control or ABS system. These systems are designed to detect tire slip, and activate the ABS system to help...

Q: Prius is entering its second decade -- what to watch out for?

The battery is a lithium battery just like the rechargeable batteries you buy except better quality. The warranty on the battery is 8 year 80,000 mile warranty on most years of the Prius. The replacement battery may be coming down...

Q: Car leaking and overheating.

The engine in your vehicle is well known for having coolant leaks from the elbows at the belt tensioner. However, there are many places coolant can leak from. The best way to pinpoint a coolant leak is by performing a...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...