Question about 2005 Ford Fiesta 1.3

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U1900 I have a fiesta st with a fault code of u1900. I think it is something to do with the modules. How do I check this out to resolve this issue?

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Posted on Jan 02, 2017

emissionwiz
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SOURCE: the transmission/engine fault warning light flashes when driving ona ford fiesta 2.0 st 2006

Hello
The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE DIAGNOSIS & TESTING IS COMPLETED.

Posted on Jul 11, 2012

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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

After diagnosis i get code u1900 for mazda 6 2007model.


This is a communication error code. One or more modules within the vehicle is/was not communicating with the vehicles computer. Possible loose connections/wiring issues or defective modules. This code may be also set if the battery was replaced/disconnected. Try erasing the code and see if it returns. If it comes back, it could take some time diagnosing the problem.

Nov 21, 2015 | Mazda 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

Remote central locking unlocking but not locking


You need the body control module scanned for fault codes by the dealer.

Apr 30, 2013 | 2008 Ford Fiesta 1.3

1 Answer

The transmission/engine fault warning light flashes when driving ona ford fiesta 2.0 st 2006


Hello
The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE DIAGNOSIS & TESTING IS COMPLETED.

Jul 11, 2012 | 2006 Ford Freestyle

1 Answer

Fiesta duratec 2005 Abs warning light on


Whenever the ABS module turns on the ABS light in the dash it is to alert you to the fact that a fault has occurred in the ABS system and the control module has turned off the ABS brake control, you now have regular non ABS brakes. The waring light will stay on until the fault is corrected. Since a large number of problems would cause this you must get the control module scanned to retrieve the fault code that was set in the control modules memory when it turned on the light. Once the fault code is known the process of diagnosis and repair can begin.

Feb 10, 2012 | 2005 Ford Fiesta 1.6

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

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