This morning driving to work the car had no power. No CEL. It was driving ok but when I put my foot down it accelerated VERY slowly... had no pickup at all. I got to my errand and turned the car off... When I got back in the car to head to work a few minutes later all was normal again. Looks like the car just needed a reboot....? Any ideas what this might be or why it happened? 2013 G37x with about 64000 miles on it.

 

In my expererience, this version of limp mode was caused by bad wiring / connector to the passenger side MAF sensor. I have a few posts about the issue in my history if you want take the time to look.
Hopefully the reboot fixed it!

 

Yes, I think you are correct. When I got home I plugged in my code reader and got a P0101 and P010B code which seems to indicate one of the MAF sensors was not happy. I'll take them out and clean them up and make sure the filters are clean, etc and go from there. Thanks.

 

did you test it with another battery ?

 

Battery in the car is less than a year old.

 

The problem might not be the battery, but the connections may be corroded. Be sure to check them after cleaning the PS MAF.

 

Confirmed the connects look clean and shiny. Took out the sensors and again they are nice and clean. I blew them out with a light blast from my compressor since i had them out. I did find a few acorns in one air box but don't think it was enough to cause the initial issue. Got that all cleaned out. So I erased the error codes and went over to have the car inspected and it failed the inspection because the O2 sensor wasn't coming online... The tech asked if I had re-set the computer recently and told him yes... He said I just need to drive it for while for the computer to get it's **** together again... sigh. Anyone know how long that takes?

BTW, the issue has not come back since the initial incident.

 

You should be able to go back within a half-hour of drive-time. Depending on the capabilities of your code reader, it will tell you when that is. Realistically just go back tomorrow and you should be able to get it tested.

Good luck,


Rick

 

Ok. Weird then, because after it failed I drove the car for almost 60 miles and went back and the O2 was still not coming online (the tech tested it with his ODB-II scanner before trying the test again). I'll try again on Thursday. Maybe the car needs to be off and on several times too? Damn computers!

 

From the FSM (Section EC):
"As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and components. Completion must be verified in order for the emissions inspection to proceed. If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use the information in this Service Manual to set the SRT to “CMPLT”. In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains. “CMPLT” until the self-diagnosis memory is erased.Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's normal driving pattern; the SRT will indicate “INCMP” for these items."

There is a whole section of the manual detailing what the ECU specifically looks for and how it judges SRT "CMPLT." Too much to post here. You have to get out and drive the car. Letting it sit will accomplish nothing.
and the regulators who mandate this crap in the name of being "environmentally friendly."

 

I am driving the car. I drove 60 miles after the initial failure. I'll be driving it to work all week. Thursday is the next opportunity I'll have time to have it checked again.