Beware of Phishing Scams Using the EECU Name. Phishing is a technique that involves tricking users into thinking they're at confidential site in order to steal the user's confidential information, passwords, etc.
These are real companies that are legit companies & scammers are using their EECU letters. So if you belong to any of these legit companies, you may want to contact them to see if they really are contacting you.  I wouldn't reply back to them as it may be the scammers trying to get your personal information from you.  Don't give out any information unless you know 100% for sure that you know it is the real EECU you are talking to.
Again, these are real legit companies that scammers are using to scam you with.
EECU Electronic Engine Control Unit
EECU Esso Employees Credit Union (est. 1969; Australia)
EECU Early Education and Childcare Unit (UK)
EECU Educational Employees Credit Union