Alan's Blog > ecu flash
ecu flash
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284 posts
Jun 09, 2012
6:45 PM

Some ECU’s on cars need to be re-programmed to work with the car because of what’s known as an engine immobilizer. These immobilizers are what make the car not start when someone is trying to steal a car or replacing an ECU. It basically shuts all power down to the car until the ecu flash is put back into the car or the correct key is used to start the car. Generally your only way around this is to have the new ECU you buy from Toms, the dealer,ecu programmer or a remanufacturer re-programmed by the dealer. Other cars don’t have an immobilizer and the ECU needs programming to get the car information stored into it.Unfortunately I’m not a guru on this subject and I don’t know exactly which ECU’s need to be programmed. What I do know is the dealer is a pain in the rear when it comes to this.
The dealer won’t do it half of the time because you didn’t buy the part from them. Some dealers are easy going and will do this for you at an extra charge. Every time I get asked about this my advice is to call the dealer ahead of time to see if it needs to be re-programmed and if they will do it for you.At this time we really don’t know exactly which ECU’s need re-programming. The few that we do know are: newer Toyotas, ecu car, Mercedes, Volvo, also some Nissans like Sentra. The reason for this is because almost all these cars have immobilizers. This is where the dealer comes in and having to call them for that information. Also the headache of finding out the dealer won’t do it! At that point the search begins for a specialist in your make or just a good all around mechanic that has the hardware to do this for you.

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