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HOW TO FIX A U1001 PROBLEM - 2004 Nissan Maxima

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I got an U1001 in my 2003 1.8 Nissan sentra. What is this, and how can I solve it.

The U1000 and U1001 mean that there is no communication between the engine control unit and another control units that are part of the CAN system (Controller Area Network) or that at some point there was no communication. Before do any repairs with the U1000 and U1001 codes, the factory recommend repairing any other problems in the car. What are the other codes that you had?Here's a link to the code. U1001 Nissan Invalid or Missing Data for Primary Id

Jun 30, 2017 | Nissan Cars & Trucks

1 Answer

What does code u1001 mean?

It's a communications problem between modules on the CANS system. U1000 is usually wiring/grounds, U1001 is usually a module. Any symptoms?

Aug 23, 2014 | 2002 Nissan Altima

1 Answer

Bucking rough idle and coding (P0463, P0550, p0037 & U1001)

With that combination of codes I would suggest checking the grounds to see if any have come loose. The first three codes are related to fuel level, power steering pressure, and possibly an oxygen sensor. The U1001 code means that there is a communication issue within the electrical system concerning sensors. When the sensors aren't working together correctly it can cause multiple problems including misfiring and rough idling. Check the grounds first, if they are fine then I would recommend taking it to someone who can check the rest of the electrical system.

Apr 23, 2014 | 2003 Nissan Sentra

1 Answer

P0420 and U1001

U1001 indicates that the ECM either isn't, or at some point in time wasn't, in communication with other controller modules on the car. From the sounds of it, I would suspect the BCM. Check the wiring harnesses at both of those places. If they are fine, you're probably going to have to replace the ECM, or spend some time looking for a short "somewhere" in the vehicle wiring, which can be a long and painful experience and would probably be wasted time in this case.

Jul 14, 2013 | 2002 Nissan Altima

1 Answer

U1001 code

Go to the Dealer they ll tell you Dont Do This By Yourself you will create more problems cause you not experienced in that field.

Jul 14, 2013 | Nissan Cars & Trucks

1 Answer

My nissan have 2 fault codes P1110 INT/VTIM CONT-B1 and U1001 CAN COMM CIRCUIT,what the solution for that problem

my car get a problem and engine check lamp was light on. The code name is p1135 b2 problem. Can u help me the way to fix it. My facebook mail is ( and same gmail too.

Jul 11, 2012 | Cars & Trucks

2 Answers

I have code u1001 in 2003 nissan sentra how can i fix this problem

It may mean the connector for your ECM Unit is not secure

Sep 11, 2009 | 2003 Nissan Sentra

2 Answers

Engine codes

sometimes coming data,but the every error comunication,for the scannner
rpm up and down same the lightgauge,low high,codes u 1001 1000

Jan 15, 2009 | 2002 Nissan Altima

2 Answers

Code U1001 Communication circut fault

u1001 trouble code what is the meaning of this

Sep 12, 2008 | 2005 Nissan Sentra

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