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u1000 error code
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Joined: 19 Aug 2013
Posts: 14

PostPosted: Tue Jan 16, 2018 11:31 am    Post subject: Reply with quote

I know I am bumping an old thread here but this u1000 code is an overheating trans and I had this issue with the bypass and a cooler that was installed by a shop that was garbage and only lasted a year. They also did not tie in the factory cooler so after a about 2k in parts from a new cluster to solenoid pack in the trans it was just an overheating trans that was doing this and going into Limp mode. So yeah towing could have done it for the OP and also doing some off road. Just sharing my 2 cents on this.
1996 Maxima GLE Over 368,000 Miles original engine and Trans, 2005 Pathfinder LE 248k miles on it and more money into it fixing the short commings of Nissan than I want to talk about.
2016 SL Pathfinder and now the 2017 Platinum Maxima added to the family.
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Joined: 20 Mar 2014
Posts: 10
Location: Farmington, UT

PostPosted: Thu Feb 22, 2018 10:56 am    Post subject: Reply with quote

I agree with real2k1. I had the same problem due to the trans fluid radiator bypass that would cause my 2008 Frontier to throw that code, limp mode, when towing in 4Lo. Note, the V6 Pathfinder and Frontier have the same 4.0 engine, radiator and trans.

Every time when I would tow my 3800lbs camp trailer to a certain camp spot that required about 1/2 mile in 4Lo, the trans would go into limp mode and I would get the U1000 code. I would be able to make it the last short distance by turning off the truck for a couple of minutes and then restarting it. The next morning it would have cooled down and I could not reproduce the problem. The tow home was all downhill, so I the problem would not come back until next time I was towing to that camping spot. I did not have a Trans temp gauge on the Frontier, so one time I brought my IR temp gun to check the Trans pan temp when it went into limp mode and it was at 245 degrees. I do realize that was not really an accurate test of the temperature of the trans fluid, as the engine, exhaust and catalytic converters would likely effect that temp, but either way, I think it was way too high.

I only did the bypass to prevent the SMOD problem. So I ended up undoing the bypass and replacing my radiator and the problem has not returned.
08 R51 LE V8 4x4: SPC UCS, RF2.5s Ext travel, RF Remote Res Rear, OME MD rear
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Joined: 13 Apr 2016
Posts: 9

PostPosted: Tue Feb 05, 2019 7:38 pm    Post subject: Overheating trans Reply with quote

Just adding my experience with my 2006 SE.

I've had mine throw U1000 and lose power many times. One time I was towing, all other times I was driving slowly up more than 4000' vertical feet going up mountain passes. I've had it happen in 4WD and 2WD. I can repeat it on the same road if I drive slow, but I can prevent it from happening if I drive faster (pulling 40-50 around winding turns). The first time it happened I popped the hood and saw smoke coming from the transmission. Every time it happens, if I pop the hood and let the vehicle cool for an hour or so, the vehicle drives normal. I've done the tranny radiator bypass.

I've concluded my issue is the granny overheating when under prolonged load driving uphill slowly.
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Joined: 31 Jan 2017
Posts: 795
Location: Virginia

PostPosted: Wed Feb 06, 2019 3:33 pm    Post subject: Reply with quote

The bypass does rob the system of cooling capacity.
Be glad your tranny went into limp home home otherwise it might be severly damaged.

The best practices solution for avert the SMOD problem is a new radiator (and restore factory ATF plumbing)
This goes double for anyone who tows.
"Rifle first, Rifle last, Rifle always"

2012 V6 4WD, in Grey over Grey
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