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2016 Pathfinder Big MPG Drop After Dealer Visit

 
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Dctommy



Joined: 16 Jan 2018
Posts: 2
Location: North Carolina

PostPosted: Tue Jan 16, 2018 6:48 pm    Post subject: 2016 Pathfinder Big MPG Drop After Dealer Visit Reply with quote

I love my Pathfinder. Got from 21 to 32 mpg until I took it into the dealer for tire pressure warning and oil change. They hooked it up to the computer and it’s starting to feel like Windows updates. Now I’m doing as low as 10 mpg around town and never above 21 mpg. I am desperate to reset the ECM to the factory settings when I bought it. The instructions they have on YouTube don’t work with the push button start. Wondering if unplugging the ECM relay will help reset it or if it’s all stored in an EPROM somewhere. Not even sure how to remove the relay without breaking it.
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smj999smj
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Joined: 22 Jan 2012
Posts: 4868
Location: Prospect, VA

PostPosted: Wed Jan 17, 2018 1:58 am    Post subject: Reply with quote

If they reprogrammed the ECM with updated software, there is nothing you can do. The only way to go back to the old program is to have the ECM reprogrammed to the previous software program. To have the ECM go back to the base settings, you can disconnect the battery for a period, but this may erase the idle air volume memory and an idle air volume relearn may be needed afterwards.
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2006 Pathfinder LE VQ40DE AWD, Nitto Dura Grappler P265/65R17, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks
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Dctommy



Joined: 16 Jan 2018
Posts: 2
Location: North Carolina

PostPosted: Wed Jan 17, 2018 5:29 am    Post subject: Thank you Reply with quote

How can I prevent it from being reverted without my permission every time they do the nitrogen for my tires?
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disallow
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Joined: 13 Aug 2008
Posts: 2664
Location: Winnipeg, Canada

PostPosted: Wed May 16, 2018 11:07 am    Post subject: Reply with quote

don't take it to the stealer... Smile
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 315000kms (195000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Bilstein 4600 rear shocks, Cooper Discoverer ATw P265/70/16
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TejasMtnBiker



Joined: 19 May 2018
Posts: 2
Location: Dallas Texas

PostPosted: Sat May 19, 2018 11:26 am    Post subject: Reply with quote

sounds like they put it in limp mode by accident Id take it back and make them fix it thats too much of a drop, stealerships are known for sneaky roach methods like this to get you to bring it back in
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