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Infiniti Forum: 2012 QX56 - P062B code - Sputtering and loss of power
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Old 07-18-2018, 03:40 PM
pjdavep pjdavep is offline
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Join Date: Feb 2016
Location: Jacksonville, FL
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Originally Posted by rbmphillips View Post
Cleaned the battery, cleaned the ECM conncetions, SES light come back on yesterday. Loss of power going up hills. What kind of symptoms does a bad catalytic converter give?
Cleaned battery, but didn't change it out for a new one? I doubt that's it at this point, unless it's somehow freaking out the computer (that's tech talk). I've had batteries going bad that made a watch run faster instead of slowing/stopping.

Bad cats would give bad gas mileage, and I'm sure the cat related codes would be thrown.

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Old 07-20-2018, 09:05 AM
rbmphillips rbmphillips is offline
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The battery tested good and passed the battery load test.
The vehicle is at the dealership now. Im getting a 2nd opinion about it all. Hard for me to believe that both harnesses and the ECM are all bad.
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Old 07-20-2018, 10:28 AM
ChesbayQX56 ChesbayQX56 is offline
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I had a similar problem with my 2013 QX56. I was getting some crazy ECM codes because the volts were low. The battery checked out Ok so I started to monitor the volts with the gauge and a live/bluetooth OBDII app. The alternator was constantly turning off and never fully charging my battery. The dealer acknowledge the problem and did something with the idle that helped a little.
Ultimately, I leave the headlights on which always keeps my volts at 13.7. I would recommend that you look at the volts gauge when it starts and then after 3-4 minutes of driving. If the volts drop way down, trying turning on the headlights.
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Old 10-11-2018, 07:19 AM
rbmphillips rbmphillips is offline
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Join Date: Jul 2018
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So your qx56 was sputtering and losing power due to low voltage? I think our daytime running lights are always on when we drive but I will double check that. Did you mean day time running lights or regular night time head lights?

Thank you for your input. I have had little luck trying to fins anyone that has had my same problem.

Replaced the ECM & EGI Wiring Harness. $3500.00 and the problem has not returned. Also had the catalytic converter location modified. We cleaned out the insides of the original cat and welded in a new cat down the exhaust a little bit so that in the future we would not have to replace the entire exhaust manifold because of cat issues. Relocated both sensors as well.
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