Check Engine Light if oil fill cap loose?

[Gormleys]

I had the oil changed on my 2015 ISB 340hp 6.7L engine and the shop forgot to tighten the oil fill cap. Fifty or sixty miles later, the dreaded "Check Engine" light comes on. I buy a 9-pin converter to use my OBD-2 reader, but of course it doesn't have the software needed to read the error. So I take it back to the shop that left the cap unsealed and they say it is a "1942 Crank Case Pressure Data Erratic or Incorrect - 1 data point." They refuse to reset the error and want to keep my coach to "diagnose the problem." Are they just trying to get money from me or is there a chance that there is a real problem unrelated to the loose oil fill cap?

[A Traveler]

Tighten the cap and find another shop. They are trying to rip you off for another hour or two of labor.

[Gormleys]

I took it to another shop and they reset the ODB code. I have only drove it about 15 miles since and the code has not reappeared. As I am storing the MH for the winter (well at least until January), I probably won't put any more miles on it until 2020. Hopefully, that is all that it needed.

[skypilot_1]

It would be doing a service here to allow others to ID that shop so it can be avoided.

[Dom]

I can't believe that given the error code, crankcase pressure problem, that they wouldn't reset the code. If it comes back, it comes back. Very poor customer relations. you should present them with the bill for re reset.

[Dav L]

It's illegal for a shop to reset a DTC (Diagnostic Trouble Code) without doing a "repair". But, if the cap was found to be loose, then for that code, that might be an appropriate repair. The most common gas code is "Low Emissions Evap Leak" typically due to a missing or loose gas cap.
But, with the story as listed, the shop should have pulled the code, tightened the cap, and cleared the code for further evaluation. That's more than what they would have done if they kept the rig.

You should double check that your rig supports "OBDII" diagnostics. Most all heavy diesels do not. J1939 is the protocol most newer diesels support. J1708 on older. The scan tool, the wiring harness and the software have to be compatible with the protocol the vehicle supports. OBDII is likely on a Gas vehicle. (Ford V10 et al).

[gatorcq]

Originally Posted by Dav L

It's illegal for a shop to reset a DTC (Diagnostic Trouble Code) without doing a "repair". But, if the cap was found to be loose, then for that code, that might be an appropriate repair. The most common gas code is "Low Emissions Evap Leak" typically due to a missing or loose gas cap.
But, with the story as listed, the shop should have pulled the code, tightened the cap, and cleared the code for further evaluation. That's more than what they would have done if they kept the rig.

You should double check that your rig supports "OBDII" diagnostics. Most all heavy diesels do not. J1939 is the protocol most newer diesels support. J1708 on older. The scan tool, the wiring harness and the software have to be compatible with the protocol the vehicle supports. OBDII is likely on a Gas vehicle. (Ford V10 et al).

IMO,, it is NOT illegal, if you think it is, then please post the Document that states it. On an auto, you can go to any auto store, they will read and reset it with no issues. It is the same with ANY diesel Engine.

As for the code, you should be able to read it yourself on the data display on your coach. Just remember to NOT TURN OFF THE ENGINE, prior to reading the code. On a Cummins, it will only allow you to read the Active Code. Once you turn off the engine, then restart it, if the code is not there, it is consider a history code.

[Dav L]

Originally Posted by gatorcq

IMO,, it is NOT illegal, if you think it is, then please post the Document that states it. On an auto, you can go to any auto store, they will read and reset it with no issues. It is the same with ANY diesel Engine.

As for the code, you should be able to read it yourself on the data display on your coach. Just remember to NOT TURN OFF THE ENGINE, prior to reading the code. On a Cummins, it will only allow you to read the Active Code. Once you turn off the engine, then restart it, if the code is not there, it is consider a history code.

I can't spend the time to do the legal research, but this article should speak to the point.
https://www.govinfo.gov/content/pkg/...df/01-8276.pdf

And, yes it's technically feasible for an auto parts store to clear codes, but the chain auto stores are training their sales staff to NEVER reset the codes. Some chain stores provide scan tool software that disables the Clear Code function. If you have found a store that does that for you, they are in jeopardy. But, it's just like being in jeopardy of driving in the left lane. A law that doesn't receive much police (EPA) attention.

Yes, there is a strategy of a Pending, an Active and a Historical DTC in most engine controllers. A good scan tool can see all.

FYI, as background, I essentially am the co-inventor of the wireless WiFi and Bluetooth scan tool. The resultant product received the Motor Tool of the Year award in the 90s. And was the Service Strategy lead for DaimlerChrysler worldwide at that time. Co-Inventor of patent 6,609,050 that leverages a wireless scan tool in a service process. WiFi scan tools are now used in every FCA dealerships worldwide (WiTech). So I know something of the subject. As current events, I just met with the other co-inventor and discussed RVs More to come...