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Pcm codes U1001 code came up

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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

U1000 2002 altima 2.5


Do you know about serial data networks ? C.A.N - controller area network . Do you know what U - codes are about ? Download 2002 Nissan Altima LAN System Section LAN PDF Manual 60 Pages

Download 2002 Nissan Altima Body Control System Section BCS PDF Manual 22...

Here are sections of factory repair manual . Read up on C.A.N . U 1000 an U1001 one of the modules is having a problem on the wiring for the C.A.N bus is . You can check at the DLC with a volt meter .

Download 2002 Nissan Altima Emission Control System Section EC PDF Manual...

CAN COMM CIRCUIT U1000 1000*6 - - × EC-137 CAN COMM CIRCUIT U1001 1001*6 - - × EC-137

Apr 03, 2017 | Nissan Altima Cars & Trucks

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U1001 u1000 2002 Nissan Altima 2.5


Do a search for TPS Transmission positioning sensor

Mar 16, 2014 | Nissan Altima Cars & Trucks

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

We have a Nissan Sentra 2003. A diagnostic with CARMD identified the problem on hand as Code U1001 Communication circuit fault. Assuming that a mechcanic accepts this diagnostic how much can I expect the...


U1001-This Relates to CAN communication line - signal malfunction
This code usually is in regards to the code reader unable to communicate correctly.
Is the vehicle operating correctly?Is the engine check or any other light up?If not ignore,just get the garage to clear the code if it will.
I hope this helps.if needed get back to me with findings,and I will do some checks myself on this to be 100%

Apr 02, 2011 | 2005 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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