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U1900 can communication bus fault code

Hello please could some ne help me i have had my car read and the codes that came up was p0603 and p0703 and u1900 please does any one know what this means i have replaced the brake switches but please if any one can help i would be more than great full

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: what does engine fault code po171 system too lean bank 1 mean thanks

i think its the oxygen sensor (pre cat) in exhaust

Posted on Sep 23, 2008

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SOURCE: Engine Fault Code P1963

solved cheers!

Posted on Apr 11, 2009

  • 5 Answers

SOURCE: 1997 lincoln town car 4.6 with a p0430 fault code

I will make an assumption here, we know what the root word means. This code was extracted from the computer by? What this is telling you one of 2 things: The Bank 2 oxygen sensor down stream of the catalytic converter (there are 2 converters, one for each bank of cylinders on the 4.6ltr engine) is bad and/or that the Bank 2 catalytic converter is no longer doing the job it was designed to do. Simply, Catalysts wear out. They are good for approx 100,000 miles (as required by Federal Law). Again, I assume that the reason the intake manifold was replaced was because it had a crack in one, or more, of the runners? (part that feeds the head of a manifold). It may have taken a while to find this as being the cause of why the car running incorrectly, maybe rough. This means, that during the time the car was being driven with the problem, the amount of unburned, or not within spec exhaust gases, coming off the side of the engine affected by the intake issue was higher than normal. This out of balance level of exhaust gases were being dumped into the converter on that side of the engine, thus causing the converter to have to run hotter, work harder, or even at the time the gas was being processed through, causing deposits to be formed in the converter, thus shortening it's life span. The Bank 1 side of the engine, apparently, did not have the issue and it's catalytic converter's life was not affected. I hope this makes sense to you.

Posted on Aug 19, 2009

ZJLimited
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SOURCE: Ihave code p0703 brake switch,what can I do?

P0703 (M) Brake Switch Stuck Pressed or Released Incorrect input state detected in the brake switch circuit (Changed from P1595).

The switch cost like 20 bucks. It is located on the brake pedal, it will either be in front of or behind the pedal at the top. It will have a plunger that contacts the pedal, and an electrical pig tail. usually you just twist it and pull it out kinda like a headlamp.

Hope this help (remember rated and comment this).

Posted on Mar 29, 2010

reisdos
  • 1297 Answers

SOURCE: LINCOLN CODE READ ON SNAP-ON SCANNER. U1262

bottom line is the U1262 is a communication failure between your scanner and a module

assuming you actually pulled the code from the PCM then you have lost communication with a different module like the ABS, DDM, LCM, RASM, HEC, PAM and any other module I can't think of right now

You need a detailed pinpoint test from a Ford service manual or aftermarket source like Alldata, Shop key or Mitchell on Demand

You could be dealing with over a 100 different test PER module

Obviously something we can't do on-line too easily

If you could at least identify which module you have lost communications with your dealer may, for a fee, copy the correct pinpoint test

Posted on May 20, 2010

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On my 05 Ford mustang v6, my fan only comes on when i turn my AC on and makes a funny noise when I turn the AC on, diagnostic test gave me a code, u1900, what does this mean and how do I fix it?


Where did you pull this code from ? What type scan tool did you use ,or was it a code reader ? Do you know about data communication networks on modern cars ? A U codes indicate a communication problem on the data network .
U1900 CAN Communication Bus Fault-Receive Error Audio Control Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error ABS Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error Instrument Cluster REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error SJB REFER to Section 418-00 . The thing that would make this easier to diagnose would be to have a factory scan tool or a professional grade . Need to know what modules can communicate with scan tool .Honestly ,Don't think you can fix this . Dealer or ASE certified repair shop .Do you know what C.A.N. - controller area network is ? The vehicle has 3 module communications networks:
  • high speed controller area network (CAN)
  • medium speed CAN
  • international standards organization (ISO) 9141 communications network
The diagnostic tool connects to the communications networks through the data link connector (DLC). The DLC allows a diagnostic tool access to diagnose and test the vehicle systems of any module on the communications networks.
All 3 communications networks are connected to the DLC. This makes diagnosis and testing of these systems easier by allowing one diagnostic tool to be able to diagnose and control any module on the 3 communications networks from one common connector. The DLC can be found under the instrument panel between the steering column and the driver door. Which module doesn't communicate with scan tool ?
Symptom Chart Condition Possible Sources Action
  • The anti-lock brake system (ABS) module does not respond to the diagnostic tool
  • Circuit or connection in the high speed controller area network (CAN)
  • ABS module
  • Go To Pinpoint Test A .
  • The audio unit does not respond to the diagnostic tool
  • Circuit or connection in the medium speed controller area network (CAN)
  • Audio unit
  • Go To Pinpoint Test B .
  • Circuit or connection in the medium speed controller area network (CAN)
  • Audio unit
  • Go To Pinpoint Test B .
  • The instrument cluster does not respond to the diagnostic tool - high speed controller area network (CAN)
  • Circuit or connection in the high speed CAN
  • Instrument cluster
  • Go To Pinpoint Test C .
  • The instrument cluster does not respond to the diagnostic tool - medium speed controller area network (CAN)
  • Circuit or connection in the medium speed CAN
  • Instrument cluster
  • Go To Pinpoint Test D .
  • The powertrain control module (PCM) does not respond to the diagnostic tool
  • Circuit or connection in the high speed controller area network (CAN)
  • PCM
  • Go To Pinpoint Test E .
  • The restraint control module (RCM) does not respond to the diagnostic tool
  • Circuit or connection in the international standards organization (ISO) 9141 communications network
  • RCM
  • Go To Pinpoint Test I .
  • The smart junction box (SJB) does not respond to the diagnostic tool
  • Circuit or connection in the medium speed controller area network (CAN)
  • SJB
  • Go To Pinpoint Test F .
  • No high speed controller area network (CAN) communication
  • Circuit or connection in the high speed CAN
  • High speed CAN modules
  • Go To Pinpoint Test G .
  • No medium speed controller area network (CAN) communication
  • Circuit or connection in the medium speed CAN
  • Medium speed CAN modules
  • Go To Pinpoint Test H .
  • No international standards organization (ISO) 9141 communications network communication
  • Circuit or connection in the ISO 9141 communications network circuit
  • Restraint control module (RCM)
  • Go To Pinpoint Test I .
  • No module/network communication - no power to the diagnostic tool
  • Data link connector (DLC) C251
  • Bussed electrical center (BEC) fuse 4 (30A)
  • Smart junction box (SJB) fuse 8 (10A)
  • Circuitry
  • Diagnostic tool
  • Go To Pinpoint Test J .

Apr 11, 2016 | Ford Cars & Trucks

1 Answer

1999. What are the probable causes of DTC P1624?


Definition of Diagnostic Trouble Code P1623 Audi: Data Bus Powertrain No Communication BMW: Pedal Position Sensor Potentiometer Supply Buick: Transmission Temp Pull-Up Resistor Cadillac: Transmission Temp Pull-Up Resistor Chevrolet: Transmission Temp Pull-Up Resistor Chrysler: ASD Relay/Control De-Energize Too Soon Dodge: ASD Relay/Control De-Energize Too Soon Ford: Code word/id number-write/read error GMC: Transmission Temp Pull-Up Resistor Hyundai: Diagnostic Lamp Powerstage Malfunction Jeep: ASD Relay/Control De-Energize Too Soon Land Rover: Immobilisation ECU code storage fault.Last occurrence - signal fault Lincoln: Code word/id number-write/read error Mazda: Immobilizer Code Word/ID Number Write Failure Mercury: Code word/id number-write/read error Oldsmobile: Transmission Temp Pull-Up Resistor Pontiac: Transmission Temp Pull-Up Resistor Saturn: Transmission Temp Pull-Up Resistor Volkswagen: Data Bus Powertrain No Communication Volvo: ETS .amp / MIL on

Jun 27, 2015 | Hyundai Elantra Cars & Trucks

1 Answer

Obd code U1900


U1900 CAN Communication Bus Fault

Mar 14, 2015 | Cars & Trucks

1 Answer

What do the code u1900 mean on the freestyle


it is no communication with the gem module. is the instrument cluster going crazy? if so it usually means theres a problem in the cluster and needs to be replaced

Sep 14, 2014 | Cars & Trucks

1 Answer

Code u1900


Hello Friends need help and advice have Mazda Tribute 2 3 2005... Problems Solutions for Mazda code u1900

Hopefully these links will work. The u1900 code is described, and there are suggestions on how to address the code issue.

Apr 29, 2014 | 2000 Mazda Demio

1 Answer

What causes obd code u110c


Read this please:

The BCM then puts the fuel level info out on the communications bus for interested modules. The PCM isn't getting the message and is turning on the MIL and setting a 'lack of communication' fault code (U110C).

Jan 13, 2013 | Cars & Trucks

2 Answers

I have an 1999 ford f350 7.3 powerstroke. I'm having white smoke coming out of the exhaust, I had trouble shot the vehicle the codes are DTC 04 p0562, DTC 03 p1670, DTC 02 p0603 and DTC 01 p0344. I...


P0344 = cam position sensor error
P0603 = Internal control module keep alive memory error.
P1670 = communication error between PCM and IDM
P0562 = system voltage low

My guess is you probably have some wiring issues but it's hard to tell exactly where.

May 16, 2011 | 1999 Ford F350 Regular Cab

1 Answer

I have a ford explore 4wd v-6 engine. i had a diagnostic test done and the codes are U1900, B2900 and U2023. The mechanic didn't tell me what they meant. Told me I need to replace my battery for $200.00,...


U1900 - is a continuous code = C.A.N. communication bus fault - receive error

B2900 - can't find

U2023 - can't find

none of these are powertrain codes. if you have no symptoms, clear codes and drive car. I think you can clear by disconnecting battery for 2 hours. then drive for 10 miles to relearn. may run rough for 10 miles.

Jan 08, 2010 | 2004 Ford Explorer

1 Answer

What does C1175,C1236 and U1900 mean?


Hi,
For
C1175 - Speed Wheel Sensor LR Input Circuit Failure C1236 - Speed Wheel LR Input Signal Missing U1900 - Communication bus fault
If the cluster is working fine, ignore U1900.
There are so many recalls and so many technical bulletin for the problems on Ford 350.
Let me know, if needed further assistance.
Hope i helped you.
Thanks for using ' Fixya ' and have a nice day!!

Nov 04, 2009 | 2006 Ford F 350 Super Duty

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