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rpmdiag
rpmdiag, Tech and Instructor
Category: Car
Satisfied Customers: 8144
Experience:  Since 1975
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Getting asc needs service warning light then outlander goes

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Hi getting asc needs service warning light then outlander goes into limp home mode
JA: Do you have the trouble code? Do you have a code reader or scan tool?
Customer: Codes are u1417 and c121c
JA: I'll pass this info along to the Mitsubishi Mechanic so that he can get you a quick fix. What year is your Outlander?
Customer: 2011*****
JA: Are you fixing your Outlander yourself? What have you tried so far?
Customer: Not tried anything yet
JA: Anything else you want the mechanic to know before I connect you?
Customer: If I switch the engine off the engine warning li Light comes on but goes off in a day or so

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

There is a loss of communication between modules due to either a bad module or a high speed CAN/BUS twisted pair wiring. Most commonly it's a failed module.

The computer system needs to be tested bidirectionally with a scan tool and ping every node to find the culprit.

Please understand that I don't know your skill level or tools
you have to assist us. Also understand that I can't see, smell,
hear, or touch the vehicle either, so your patience is
appreciated. JA is a great Q/A site, but it does not replace a
repair shop. So please don’t shoot the messenger if I have to
deliver bad news:)
If you are satisfied with my answer, I would greatly
appreciate a 5 star rating now before you leave the site and I
will still assist you after you have rated me too if another
question pops up. I don’t get credit for helping you until
you rate me

Thanks, Ron

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