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I continually have a bunch of engine/drivetrain/BCM codes every time I scan the car. (No, I'm not going to stop scanning the car once in a while.)
Only two are permanent, even though what those codes are for, work fine. The mist detector has: U013C2-86 and U13C2-96. The wipers work as they should even when it is just misting.
I also have 8 intermittent codes that keep cropping up. I clear them and when I scan again, after a while of driving, the same ones are back. Again, intermittent.
The battery is fully charged.
I'm as convinced as I can be that the answer is an intermittent can-bus problem communication problem.
I do not have an oscilloscope, nor do I know how to use one. I also do not want to go to a dealer as I know that cost will be huge.
Is there anyone in the Nashville, TN to Bowling Green, KY area that would be willing to help with a diagnosis?
A couple of codes refer to the all wheel drive which I do not have. My car is rear wheel drive only.
I doubt that this will help but here is a list of the intermittent codes:
U042B-68
U0447-00
U0001-87
U0121-00
U012A-00
U0294-00
U2011-71
U0140-08
The time before this I also had a wheel speed sensor code that isn't showing up on this scan.
U042B-68 Invalid Data Received From Chassis Control Module A U0447-00 Invalid Data Received From Gateway A U0001-87 High Speed CAN Communication Bus - Missing message U0121-00 Lost Communication With Anti-Lock Brake System (ABS) Control Module U012A-00 Lost Communication with Chassis Control Module A U0294-00 ?? U2011-71 Motor - Actuator stuck (deployable spoiler) U0140-08 Lost Communication With Body Control Module - Bus signal/message failures
Does your spoiler work? It’s interesting that’s the only code that isn’t explicitly a communication error.
And here’s a diagram of the vehicle networks. If you look carefully, it shows breakpoints (connectors) in the buses. I’m guessing that chassis control module == body control module, which is part of the CJB (Central Junction Box.) The document spells out all the acronyms below. https://www.dropbox.com/scl/fi/r5j5t...=2ueb1pp3&dl=0
Spoiler still stuck in the lowered position.
I'm not terribly worried about the individual codes at this time. I want to figure out they are always intermittent. To me it means there is most likely a can-bus problem that needs to be addressed.
Last edited by David4883; Jun 10, 2025 at 02:47 PM.
U0447 is often a secondary battery problem. My car has that code and it does tend to go away if i bother to charge the secondary battery. My secondary battery has never been replaced so it's probably on the way out. I don't really care about it so I'm ignoring it for the time being. That said, considering you have quite a lot of codes, maybe a grounding issue?
Intermittent trouble codes
