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Truck sat for about 2 hours, went to start it and the CEL was gone..
I always thought that when the check engine light comes on, it’ll turn off only when it is cleared with the computer.
Truck sat for about 2 hours, went to start it and the CEL was gone..
I always thought that when the check engine light comes on, it’ll turn off only when it is cleared with the computer.
May be a pending code. If it wasn't cleared, it will still be in the DTC of the ecm
Truck sat for about 2 hours, went to start it and the CEL was gone..
I always thought that when the check engine light comes on, it’ll turn off only when it is cleared with the computer.
No, if the issue that turned the code on went away on the next start, the code light won't come on anymore, but the code should be stored.
I wouldn't worry about it, it was not a code that would make it limit power or speed.
I would say a good majority of codes when cleared never return. Make note of it with date/mileage then clear the code to see if it returns. If not all good if it does at some point in the future at least it’s repeatable.
A one time code if brought in for repair will be a guess at best of what caused it. You will most likely have to spend money on this “guess” which may be a waste. Even if nothing is replaced you will most likely pay some sort of “diagnostic” fee.
Clear it, make note then move on.
I worked in the high tech world of multi-million dollar electronic test equipment for 30+ years. Have seen loads of false failures, glitches, etc. Many are a one time only and anyone’s guess of why it happened.
The PCM has detected that the heater element for your indicated NOx sensor circuit is either open or shorted. The sensor won't heat up to operating temperature as quickly as it should. Your truck should not go into reduced power mode for this failure.
I just had my 2022 SD 6.7L serviced for that issue and the dealer stated this was a PCM programming issue. It could be a bad NOx sensor or corroded contacts and I've heard that several have failed. If I remember correctly, Aaron from Powerstroke Tech Talk PTT replaced one in a YouTube video on a 2020+ SD.
I believe the service tech did more than that. Appears he tested several NOX sensors, some passed the Pin Point Test (PPT) and a NOX sensor failed via ohm tests, he/she did a visual inspection of the NOX sensors, and then replaced a NOX sensor LC3Z-5L248-A Sensor Assembly, then he cleared the stored DTCs and test drove the rig and verified no DTC present. Also appears he performed 22E04 reprograming of the powertrain control module (PCM) and transmission control module (TCM) and cleared all DTCs.
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