sparky1562

I am getting the P0101 code. On my code reader it lists it twice, one says "permanent" and will not go away when I clear codes. Anyone know what that is all about?

Anyone have the text of the NTB12-051J bulletin?

Thanks!
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wildcat08

I have not experienced this, but found an article that explains why it got set:

Permanent DTCs

These are the new, emission-related DTCs that can’t be cleared from the ECM or TCM until the computer knows for sure that the problem was fixed. This usually involves performing a Universal Trip Drive Pattern exactly as described, but there are other ways, such as performing a dedicated monitor cycle. Permanent DTCs first appeared on certain 2009 vehicles, and are being legislated on 2010 vehicles. As with any new technology, the “glitches” may need to be worked out in the field, so reading the repair manual and TSBs are important steps before beginning diagnosis.

Universal Trip Drive Pattern

So, how to clear a Permanent DTC? By performing a Universal Trip Drive Pattern that meets the strict criteria in the repair manual, to prove to the computer that the fault has indeed been repaired and no one is trying to cheat on an emissions test. After performing this Drive Pattern, if the code doesn’t clear it’s usually because the strict criteria were not followed exactly. It’s a pain, but that’s the way it goes.

Typically, this Universal Trip Drive Pattern starts off by clearing all the DTCs so that only the Permanent DTC remains (always refer to service information for applicable information and procedures).

Then turn the ignition ON, start the vehicle and let it idle for at least 30 seconds. Then, without cycling the key, drive the vehicle for at least five minutes at more than 40 km/h. Then (again without cycling the key) let the vehicle idle for at least 30 seconds before shutting it OFF. The whole drive cycle must take at least 10 minutes. After performing a Universal Trip Drive Pattern, the computer clears the code, since it’s “seen” that the problem is fixed and not reoccurring. Sounds simple enough, and most problems have apparently come from not performing the Universal Trip Drive Pattern correctly, but time will tell if these new DTCs will be problematic.

Dedicated monitor cycle

If you’d rather not perform a Universal Trip Drive Pattern, performing three dedicated monitor cycles will also clear a permanent DTC. This way takes more time and some research, but it works and it’s always good to know more than one way to get things done.

To clear the Permanent DTC using a dedicated monitor cycle, start by repairing the fault that caused the DTC in the first place. Then clear all the codes except for the permanent DTC (if it were that easy, there’d be no problems), and make sure the Permanent DTC is the only one left.

Then look up the details for that specific monitor drive cycle in the repair manual, and road test the vehicle under those conditions — three separate times. You’ll need to complete three of these cycles (from cold start if applicable) to successfully clear the code. After the monitor runs three times with no problems the code will clear and you’ll be happy (confirm this, though).

Maybe clean the MAF, clear the one that you can and then try to do one of the permanent DTC code clearing methods.

sparky1562

Good info. Thanks!