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

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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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2008 Expedition 5.4l codes: P0607, P2004, P2107, U1900, B1676.


P0607 - Control Module Performance Description: Indicates that the powertrain control module (PCM) internal central processing unit (CPU) has encountered an error. The PCM monitors itself and carries out internal checks of its own CPU. If any of these checks returns an incorrect value, the DTC is set. Possible Causes:
  • Module programming error
  • Aftermarket performance products
  • Damaged PCM
Diagnostic Aids: Application Key On Engine Off Key On Engine Running Continuous Memory All Reprogram or update the calibration. Check for other DTCs or drive symptoms for further action. Make sure to check for aftermarket performance products before installing a new PCM. If it is necessary to install a new PCM, refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) .
P2004 - Intake Manifold Runner Control (IMRC) Stuck Open (Bank 1) Description: This DTC is set when the IMRC is commanded closed, but the IMRC monitor indicates open. This DTC replaces P1518 and P1537. Possible Causes:
  • IMRC monitor signal circuit shorted to PWR GND or SIG RTN
  • Damaged IMRC actuator or solenoid
  • Blocked vacuum hoses
Diagnostic Aids: Monitor the IMRC and IMRCM PIDs. The IMRCM state should change when the IMRC is commanded open or closed. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test HU .
P2107 - Throttle Actuator Control (TAC) Module Processor Description: The electronic throttle control (ETC) area of the powertrain control module (PCM) failed the self-test. The concern could be the result of an incorrect throttle position (TP) command, or TAC motor wires shorted together. Possible Causes:
  • TAC motor wire shorted together
  • TAC motor circuit wires short to PWR
  • Damaged electronic throttle body (ETB)
  • Damaged PCM
Diagnostic Aids: A TAC motor circuit PID reading may indicate a concern, if available. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test DV .
B1676 Battery Pack Voltage Out of Range ABS Module REFER to Section 206-09 . U1900 CAN Communication Bus Fault - Receive Error Power Running Board Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error RCM REFER to Section 418-00 .

Nov 25, 2017 | Cars & Trucks

1 Answer

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

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

What is the most likely cause an error code u1900 in a 2008 ford explorer xlt 4wd


Do you know what a serial data network is ? With all the computers car makers put on thier cars these day's they need a communication network for them to talk ,share info. on etc. U codes are codes for the network . A module could be down ,could be a wiring problem . A shorted module or bus wire can bring down the whole vehicle. Could cause the vehicle not to start ,systems not to function . How did you pull this code ,with what scan tool or code reader ? Did it come from the PCM - engine computer ? Need a up scale professional scan tool to check all module's on the vehicle , need to pin point the module that is causing the problem .
U1900 CAN Communication Bus Fault - Receive Error 4WD Control Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error ABS Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error DSM REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Instrument Cluster REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Occupant Classification Sensor Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Parking Aid Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error RCM REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Retractable Running Board Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 .
016 CAN Communications

SECTION 418-00: Module Communications Network 2007 Explorer/Mountaineer/Explorer Sport Trac Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 08/02/2006 Communications Network Vehicle communication utilizes both medium and high speed controller area network (CAN) communications. CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking, is a method for transferring data among distributed electronic modules via a serial data bus. Without serial networking, intermodule communication requires dedicated, point to point wiring resulting in bulky, expensive, complex, and difficult to install wiring harnesses. Applying a serial data network reduces the number of wires combining the signals on a single network. Information is sent to the individual control modules that control each function.
The vehicle has 2 module communication networks:
  • Medium speed (MS) CAN
  • High speed (HS) CAN
Both networks are connected to the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be able to diagnose and control any module on both networks from one connector. The DLC can be found under the instrument panel between the steering column and the audio unit.
Network Topology

Module Name Network Type Termination Module Anti-lock brake system (ABS) module HS-CAN No Audio control module (ACM) MS-CAN No Digital versatile disc (DVD) player (if equipped) MS-CAN No Driver seat module (DSM) (if equipped) MS-CAN No Electronic automatic temperature control (EATC) module (if equipped) MS-CAN No Four wheel drive (4WD) control module (if equipped) HS-CAN No Instrument cluster (IC) (gateway module) HS-CAN
MS-CAN Yes
Yes Occupant classification sensor (OCS) module HS-CAN No Parking aid module (PAM) (if equipped) MS-CAN No Powertrain control module (PCM) HS-CAN Yes Power running board (PRB) module (if equipped) MS-CAN No Restraints control module (RCM) HS-CAN No Satellite digital audio radio system (SDARS) (if equipped) MS-CAN No Smart junction box (SJB) MS-CAN Yes Transmission control module (TCM) (if equipped) HS-CAN No
MS-CAN Network Operation
The MS-CAN network communicates using bussed messages. The MS-CAN has an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
The MS-CAN is a medium speed communication network used for the following modules:
  • SJB
  • Audio unit
  • Instrument cluster
  • DSM (if equipped)
  • DVD player (if equipped)
  • EATC module (if equipped)
  • Parking aid module (if equipped)
  • Satellite audio receiver (if equipped)
  • Power running board module (if equipped)
HS-CAN Network Operation
The HS-CAN network communicates using bussed messages. The HS-CAN network uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
The HS-CAN is a high speed communication network used for the following modules:
  • PCM
  • TCM (if equipped)
  • RCM
  • ABS module
  • Instrument cluster
  • Occupant classification sensor module
  • 4WD control module (if equipped)
Network Termination
The CAN network uses a network termination circuit to improve communication reliability. The network termination of the CAN bus takes place inside the termination modules by termination resistors. Termination modules are located at either end of the bus network. As network messages are broadcast in the form of voltage signals, the network voltage signals are stabilized by the termination resistors. Each termination module has a 120 ohm resistor across the positive and negative bus connection in the termination module. With 2 termination modules on each network, and the 120 ohm resistors located in a parallel circuit configuration, the total network impedance, or total resistance is 60 ohms.
Network termination improves bus message reliability by:
  • stabilizing bus voltage.
  • eliminating electrical interference.
Gateway Module
The instrument cluster is the gateway module, translating HS-CAN to MS-CAN and vice versa. This information allows a message to be distributed throughout both networks. The instrument cluster is the only module on this vehicle that has this ability.

Aug 30, 2017 | 2008 Ford Explorer 2WD

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

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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