2015 sonata seized engine - Hyundai Forums : Hyundai Forum
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post #1 of 6 (permalink) Unread Yesterday, 07:38 PM Thread Starter
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cmoney is an unknown quantity at this point
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2015 sonata seized engine

Question as i was unable to find the correct thread. My 2015 sonata engine seized on me due to a crack in one of the cylinders. i do not get a warranty as i am the second owner. Now i bought a good condition used motor from a 2015 with 16k miles. My motor had 70k miles. We took out the old motor and took all the sensors headers etc from the original block and put swapped everything back onto the new motor. Everything is plugged in correctly , all the sensors, all ground are good the starter is good. I replaced the spark plugs and all the fluids. After putting everything back together the motor cranks but will not turn over or fire. There is no spark to the spark plus. My mechanic said that ECU is shorted from the seize. Has anyone been through this before? He plugged it into the obd2 scanner and nothing is communication. A little insight would be awesome before i replace parts that i dont need to BTW. its a 2.4L. Sonata Se
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post #2 of 6 (permalink) Unread Yesterday, 07:47 PM
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Sorry I cannot help with problem but:

1) did engine crack our of nowhere or was there an incident/lack of maintenance?
2) how much did you pay for that engine? (sounds like a good engine)

I like my car and it seems the engine is the only possible weakness.

I'm a second hand owner also-already dealing with a VCM issue at 78k.

Last edited by michael7227; Yesterday at 07:53 PM.
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post #3 of 6 (permalink) Unread Yesterday, 07:54 PM Thread Starter
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cmoney is an unknown quantity at this point
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lack of maintenance which i understand but the mechanic said it was bound to happen regardless of maintenance. The engine started knocking and eventually seized

I paid 1k for the engine i got a good deal on it. great condition
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post #4 of 6 (permalink) Unread Yesterday, 08:05 PM
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Circuitsmith is an unknown quantity at this point
No OBD communication.
Did mechanic confirm with a meter ECU is getting power?

"Don't let the same dog bite you twice."
- Chuck Berry
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post #5 of 6 (permalink) Unread Yesterday, 09:48 PM
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Hopefully someone with more knowledge will jump in.

ECM a very tough part and almost never fail IMO. Engine seizing wouldn’t likely do anything.

Lots of electrical connections to be made after motor change, could be missing harness connections.

Not cranking could be tranny shift selector switch adjustment; trying starting car in neutral see if it helps.

With key on can you hear fuel pump pressurize for a few seconds ?
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post #6 of 6 (permalink) Unread Today, 11:24 AM
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Re-check all the cable connectors to verify that a pin did not slide back and is not making contact.


Frank 2017 Sonata Se with 24.6K miles
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