Question about 2005 Nissan Sentra

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Code U1001 Communication circut fault

Check engin light came on, had a diagnostic run on the car and they came up with a few codes one was a dealer code U1001 which is a communication circut fault. after calling the dealership they want me to pay $110.00 for the 1hour long diagnostic on top of any repairs needed, is this necessary or can I ignore it till I have the money to fix it?

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U1001 trouble code what is the meaning of this

Posted on Jul 01, 2010

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Same car, same symptom, plus really rough starts. Not sure what diagnostic code turned up. Will let you know if I can find it.

Posted on Oct 08, 2008

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Check engine light is on ( solid ) and not enough power while driving. What could be the problem?


If the check engine light is on then there is a problem in the engine or transmission or a related system. You may be in what is called "LIMP" mode. What needs to be done is have the dealer or a well equipped shop run a fault code test and do the diagnostics associated with the code or codes.

Jun 20, 2016 | Cars & Trucks

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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 (netsoe.cyrix@gmaik.com) and same gmail too.

Jul 11, 2012 | Cars & Trucks

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Truck will be running fine, then all of a sudden it will completely shut off. After we wait a few minutes and pump the clutch and make sure it is all the way to the floor it will start, sometimes. S


You need the engine computer scanned for fault codes, i thank you have an ignition control problem like a module or distributor pickup coil issue. These parts whenthey fail should leave fault cdes so get them read.
Next, the check engine light will pause shortly followed by the second digit of the trouble code. For example if the check engine light blinks once and pauses followed by six blinks the trouble code number would be 16. If no code is present the check engine light will stay one constantly. To restart code gathering turn the ignition key to the "off" position, wait three minutes and turn the ignition key back "on" again without starting the engine. Remove the jumper wire once code gathering is complete. To clear code after the repairs have been made remove the negative battery cable for one minute and reconnect.
toyota_dianostic_connector.jpg
Toyota Diagnostic Connector
Toyota Code Definition Table
Code 11 Momentary interruption in power supply to ECU (electronic control unit or computer) up to 1991
Code 12 Engine revolution signal missing Code 13 Rpm signal to ecu missing above 1000 rpm
Code 14 Igniter signal to ecu missing
Code 16 A/T control signal missing from ecu
Code 21 Main oxygen sensor signal fault
Code 22 Water temperature sensor circuit fault
Code 23 and 24 Intake air temperature signal fault
Code 25 Air/fuel ratio LEAN
Code 26 Air/fuel ratio RICH
Code 27 Sub-oxygen sensor signal or heater circuit fault
Code 28 No. 2 oxygen sensor/heater signal fault
Code 31 and 32 Air flow meter circuit or Vacuum sensor signal fault Code 34 and 36 Turbo-charging pressure signal fault
Code 35 Altitude compensation sensor signal fault
Code 41 Throttle position circuit fault
Code 42 Vehicle speed sensor circuit
Code 43 No starter signal to the ecu
Code 51 AC signal on; DL contact off (in transmission shifter with diagnostic connector jumped)
Code 52, 53 and 55 Knock sensor fault Code 71 EGR system malfunction
Code 72 Fuel cut solenoid signal fault
Code 78 Fuel pump control signal fault
Code 81, 83, 84 and 85 TCM communication fault

Jun 28, 2012 | 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

2005 nissan almera,1.5letre.. fault code po725


P0725 NISSAN - Engine Speed Signal

The P0725 Codes is triggered when TCM does not receive the engine speed signal from ECM.

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
- Open or shorted CKP sensor circuit condition
- Poor CKP sensor electrical connection
- Check communication error between the ECM and TCM
- Failed CKP Sensor

Possible solution:
Very common problem with Nissan vehicles, usually replacing the Crankshaft Position sensor takes care of the problem.

Keep us updated.

Feb 12, 2011 | 2005 Nissan Altima

1 Answer

Check engine light is on; still runs great and no dealer around to check it out.....


If the MIL (check engine light) is on, the vehicle has stored a fault code. If there is no dealer around to check it, I would recommend picking a OBDII scanner up from your local part store. They are not like the ones dealers and shops use, but it will tell you the diagnostic trouble code (DTC) and from there you can track down the issue your vehicle is having.

Jan 20, 2011 | 2006 Lexus RX400h Used Cars

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I have an engine code u1000 for my 2005 nissan altima. whats that mean?


basically that is a communication code between one or more computers

you need a dealer scan tool or something similar like the $8000 snap-on scanner to verify which computers are suspect and a DVOM to measure voltage on the communication circuits between the suspect computers

long story short.... this is a job for a select few technicians.... your best bet, depending on where you live.... is the dealer

Sep 16, 2010 | 2005 Nissan Altima

2 Answers

My Check Engine Light came on in my Chevy Colordo 2007


there are many reasons for this i reccomend having it put on a computer at a trustworthy shop or the dealer

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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

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