I recently failed emissions testing in Tennessee due to "battery reset" issue. The technician stated everything emissions was good and would have passed, however, the "battery reset" had not occurred. I was not familiar with "battery reset" on Jeeps and asked the technician to explain. Unfortunately, he did not know much about "battery reset" and only offered the premise a Jeep has to be driven "X" amount of miles before the battery resets. Does anyone on this forum have information on "battery reset"? Thanks!
Recently failed emission testing due to battery reset
- Thread starter robertdTN
- Start date
Other way around.
If you disconnected the battery the computer knows how long ago that was and reports it to emissions testing. The tester wants to know that you didn't just reset your computer by unplugging the battery without fixing a problem.
If you disconnected the battery the computer knows how long ago that was and reports it to emissions testing. The tester wants to know that you didn't just reset your computer by unplugging the battery without fixing a problem.
Did you disconnect the battery at all recently? There is a code that pops up that says something along the lines of "battery has been disconnected within the last 50 starts".
I would venture to say that the inspector is incorrect. If you have no CEL and your emissions monitors have passed then you should be good. That stored code is for informational purposes only to let the inspector or technician know that incomplete monitors may be due to a battery having been recently disconnected.
Just went for Smog here in CA and I had disco'd my battery not long before that. There was nothing regarding that in my SMOG report.
Exactly. Happened to me once before, and I learned my lesson.
Never go do your emissions if you have recently reset the battery.
In CA, it has nothing to do with a battery disconnect. It has to do with codes having been cleared recently...either by disconnecting the battery, pulling the EFI fuse, or using a code reader/scanner to clear the codes. When this happens, you also delete the monitor history. The system performs a self check of 02 sensors, cats, EGR, EVAP, etc...on a schedule. There are often certain drive cycle patterns that need to exist in order for the monitor test to run. These specific drive patterns will usually occur by accident during your normal driving, and the monitors should all set within 20 miles or so or around town with some mixed highway. If all the monitors have passed (in CA, you're allowed the EVAP monitor to be incomplete) and there is no CEL, it will pass...especially on 2000 and later where they simply perform the OIS test, which involves only plugging into the OBD2 port, which checks for codes and monitors.
A few years ago, I had a CEL for very small emissions leak that I couldn't find. I needed an emissions test to renew the registration. As I waited in line to go on the rollers, I cleared the CEL with my OBDII reader and passed minutes later.
Did you have it serviced at a shop after you installed the battery?
I know if you unhook the battery the computer will reset all the systems it monitors, but after you put some miles on it they will be set. My scanner will read inc. if it hasn’t completed setting the monitors.
I know if you unhook the battery the computer will reset all the systems it monitors, but after you put some miles on it they will be set. My scanner will read inc. if it hasn’t completed setting the monitors.
Well, maybe that is the problem? You haven't touched it since 2018. If it was Jan. of 18 it would be almost 2 years since you installed it. Even if it was Dec. 18 it would be a year since you touched it. I would say to touch it and clean the posts and clamps. Could possibly be getting build up on it from not being touched in a year??? Just a thought?
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