Skip the auto shop - Our mechanics make house calls

Q: Does a new ECM for this year make model need to be flashed in order to drive the vehicle? 2004 Ford Focus

asked by on

Considering purchasing a 2004 ford focus with a bad ECM. Id like to replace the ECM but id like to know if I need flash the ECM in order to drive the vehicle. If so, what side effects will I have from driving this car with an unflashed ECM.

My car has 179000 miles.
My car has an automatic transmission.

A: Yes, a new ECM will have to flashed before ...

Yes, a new ECM will have to flashed before you can even start your vehicle. The "flashing" or programming of the ECM will require your VIN number to the supplier, who should be updating the most current software for your specific vehicle. Otherwise, you would have to tow the vehicle and the new ECM to a Ford dealer for this service. Make sure your parts supplier has the capability of doing this before selecting them so your replacement will not leave your stranded.

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: I purchased a new computer for it does it need programed

You would need to have it programmed to your VIN. Have the computer scanned to see if you have a good crank shaft signal first, before replacing the ECM. You may not need the ECM replaced; you may have a...

Q: My car shudders sometimes when I'm changing speeds.

The problem you are experiencing is most likely an internal transmission clutch failure. You should be very concerned. The transmission could potentially fail completely at anytime. This is a common problem with your vehicle as well as the fiesta. The...

Q: I have some individual issues in a car, battery replacement, and power steering fluid flush. How much do you charge per day/per hour.

Billing question sent to CS for power steering fluid flush, car battery replacement, and diagnosis full car repair.

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.