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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: What does ECP and ECM mean and is it bad?

Hello. I suspect you mean EPC (not ECP), which stands for electronic pedal control or electronic "gas pedal linkage". There is no longer a physical cable, wire or lever between the gas pedal, and the throttle body on the engine...

Q: ford foucs 1.6 2002 -blue smoke ,struggling to rev and sounds like its running on 3 cylinders

Blue smoke is generally a sign the engine is burning oil. Oil can get into the combustion chamber from weak valve team seals or a malfunctioning positive crankcase ventilation system. If the check engine light comes on, this may shed...

Q: Where do I find the vehicle identification number?

The vehicle identification number, or VIN, for your car gives a lot of information about the vehicle. You’ll also need it for titling purposes, for insurance and in many other situations. The information contained in the VIN includes where...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.