1999 Sonata v6 engine codes U0D00 & U0600
 

i have two engine codes that are in the ecu that dont set off the check engine light. U0D00 and U0600 i have tried finding some literature on these codes but have come up empty! im hoping someone has seen this problem before and can help me out! Thanks

U codes are considered Undefined.

The only other time I heard of the U0D00 code it was a problem with the MAF. That's where I'd start.

thank you! i have also already replaced the MAF with no change in the codes!

Did you delete the codes after replacing the MAF?

yes cleared the codes and also ground shorted battery as well after checking and codes were still there!