I had my auto parts store read the code and all they found were three instances of P0455 EVAP LARGE LEAK and nothing else. So I took it in, without clearing the codes.
The dealer reported: “SEVERAL LIGHTS ILLUMINATED ON DASH. PERFORMED FULL DTC SCAN OF VEHICLE AND FOUND ONE PRESENT CODE OF CO231 PARKING BRAKE ECM FAILURE. THIS IS DUE TO DASH LIGHT ILLUMINATION CURRENTLY. ALSO DETECTED CODE P0455 EVAP LARGE LEAK. THIS CONDITION IS DUE TO A LOOSE GAS CAP.”
They then without coming to talk to me, “tighted” the gas cap and cleared the codes. When I read the bill closely and asked about the CO231 Parking Brake ECM Failure, they said they had no indication that the CO231 was real because there was no data saved? So my questions:
- ON a 2014 OB, does a CO231 code occur with a loose gas cap condition? (Aren’t they unrelated systems?)
- What are they meaning when there is “no data” even though there is a CO231 code?
- Is it standard practice for dealers to only do what a diagnostic flow chart says without fail and without deviation?
(That seems very selective since for things like wheel bearings there isn’t some electronic gizmo or sensor involved, so they clearly don’t depend on a diagnostic code driven “flow chart” for everything.)
- When I said the CO231 seems more important involving a safety issue, and that I would approve investing an hour in diagnosis, why didn’t they pursue that problem?
[I was surprised that simulating signals to validate things responded correctly after the code was cleared (specifically thinking of the CO231) was not a diagnostic process they would entertain.
- When I have something that requires real diagnosis effort, what do you guys do if the dealers won’t?
