Hi All
The check engine light came on in my 2018 Hyundai Santa Fe Sport. I used my code reader and got U0001 and then there was another code on the second page which I didn’t write down. I thought it was an older code (figured the first to appear was the issue) and accidentally deleted the second.
My wife had it at a shop yesterday and they found it strange that there wasn’t more than 1 code and couldn’t figure it out. Suggested taking it to the dealer.
My question is: If I delete the U0001 code, will the engine light go off, and then eventually both codes will reappear as the problem hasn’t been fixed yet?
Thanks for any input
Delete the U0001 code. That should remove the CEL If the problem still exists it will come back and set codes. That code is a high speed communications network error.
A bit of advice, if you intend to take it to a shop, don’t erase codes.
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For sure. I only erased it by accident. I do intend to take it in to Hyundai, so that’s why I was wondering if I could somehow get the codes back and make it easier for them
It doesn’t make it easier for them. Their scanners are much better than yours.
Ok. Appreciate the advice. Just to clarify - best to just leave as is with the single code for the dealer to assess?
Thanks again
If the error has gone away, the cel will turn off on its own after about 5 ignition cycles. If you can’t live with that, clear it and drive on.
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The dealer will have a scanner that is capable of retrieving history codes.
Types of Codes
When we refer to codes, there are two types that are of interest: current codes and history codes.
Current codes are codes that the internal monitoring system of the computer has deemed necessary for attention. History codes are codes that have had a fault that either has been repaired or is no longer considered as important to the overall vehicle condition by the computer.
But, the computer program still feels it is necessary to leave a trace for the technician to follow for any needed evaluations.
History codes are extremely helpful in diagnosing intermittent failures. These history codes become a “bread crumb trail” back to the source of a problem. I would advise not to just clear history codes unless you have written them down and checked them out thoroughly.
Tester
You’ll be wasting your money if this code randomly appears after many miles of driving. The shop won’t be able to reproduce the problem and will still charge you. The dealer might be aware of a common issue with the vehicle to check for but it’s unlikely. Cheaper to wait until it gets worse to the point where the code comes back immediately. This might mean that the car can’t be restarted if it has a theft system that requires communication to the ECU to be working.
@jlmorrison2_185983
is the vehicle running ok? One shop looked at it and found no issue- did you only ask them to check codes? or did you ask them to repair or diagnose a drivability issue?
We took it to the shop to get them to check the code and see if the problem was something they could repair or whether I’d have to go to the dealership. When they read it they could only find one code and said it alone (u0001) told them there was a communication issue but without an additional code, they can’t tell which system it involves. They suggested going to the dealer. So the problem hasn’t been resolved and honestly, I haven’t noticed anything wrong with the vehicle (except the backup camera hasn’t been working for some time). I was just wondering if I should take it in as-is, which it sounds like I should, or if I should erase the code and keep driving, hopefully triggering the pair of codes to return and make it easier to pinpoint.
my vote: erase it and keep driving. If you notice a drivability concern or a dash light come on, then take it in.
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