Q: Will a bad ecm ruin fuel injectors. Should mechanic always test fuel injectors before replacing ecm?

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2007 international diesel. Will a bad ecm ruin fuel injectors. Should mechanic always test fuel injectors before replacing ecm? Replaced ecm now mechanic says ecm ruined fuel injectors. Is that common?

ECM failures are relatively uncommon and thus there has to be an impeccable reason, that is a conclusive diagnostic, justifying ECM replacement in the first instance. Indeed, statistics prove that fully half of all ECM’s returned for warranty exchange are actually perfectly good.


In regard to your question, the causation is actually the reverse of what you have stated. That is, a malfunctioning ECM will not typically damage the solenoid (the electrical component) in a fuel injector. However, if a fuel injector solenoid is already shorted, that fault can damage the ECM enough to require ECM replacement. As far as the injectors being "ruined", they can be tested to determine if there is a failure and what exactly the failure is.


At this juncture, if you still have a no start condition and you are trying to diagnose it, feel free to request YourMechanic’s no start diagnostic service. A certified Mechanic, dispatched by YourMechanic right to your location, will get this issue resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.

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