REading 2006 Sonata check engine light code

Voyager · 2010-01-10T01:18:56+00:00

Hyundaitech,My Sonata threw a code tonight. Is a code reader the only way to access the code? Is there a secret handshake method such as what GM and Chrysler have had for years?For those who don't know, on both of these brands you can read many codes yourself. On the GM, you short two pins on the code reader connector and the code will flash on the check engine light. Chrysler is even smarter. There you, if memory serves, turn the ignition key from off to on to off to on to off again in less than something like 3 seconds and the code will flash on the MIL.Does Hyundai have a secret handshake method?

Jan 10, 2010 46 Replies

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hyundaitech 16 years ago

I wonder if there's a problem with your fuel sending unit. Can't remember off the top of my head whether it's monitored by the ECM. Numerous problems with these in early production '06 Sonatas.

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hyundaitech 16 years ago

Okay, skip the sender idea. I'm guessing you have a leaking intake manifold gasket. Have done a few of these on 4-cyl '06 and newer Sonatas. This would explain the roughness as well. In fact, it's usually obvious if you remove the plastic engine cover and look around.

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Voyager 16 years ago

Yep, that appears to be it. Any idea why this is a common failure mode? I've never before had a vehicle where the intake manifold gasket failed and I've run several cars well over 100,000 miles.

Is the replacement gasket better than the original? Do I need to plan to replace this every 50,000 miles on this engine?

Matt

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hyundaitech 16 years ago

My only suspicion is improper torque from the factory, either too loose allowing the gasket to get sucked in, or too tight, damaging and weakening the gasket so it can get sucked in. Usually, a portion of the gasket indeed gets sucked in. I don't see enough failures to expect that all cars will have it, just enough to know that with certain symptoms, this is an excellent first place to look. In my opinion, the gasket is stout enough-- a couple layers of thick paper like most intake gaskets. Have seen no difference in construction between replacement gaskets and the originals.

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