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What does an error code u2100 mean - 2005 Saturn ION

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Well a U code like U2100 is a communication error,meaning there is a bad computer in the car or a wires issue,one of the other computer in the car can not talk to the other so its send a loss of communication code as you got,,,,i would highly rec you go to the dealer for this concern

Posted on Oct 19, 2009

  • Anonymous Oct 19, 2009

    well a U code like U2100 is a communication error,meaning there is a bad computer in the car or a wires issue,one of the other computer in the car can not talk to the other so its send a loss of communication code as you got,,,,i would highly rec you go to the dealer for this concern

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2008 body control module Chevrolet equlnox reads code u10140


u10140 ??? too many numbers, should only have 4 at most . U code's are GMLAN network code's . Do you know what a serial data communication network is ? All the modules , PCM/ECM , BCM , instrument cluster , ABS , SRS etc... all take to one another (share info.) on this data network . Computer talk. U code's can mean a module stopped talking or a problem with wiring etc... DTC U0020
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It refers to a problem in the electronic communication network the car has, called the "can-bus".

U2100 - CAN-BUS Communication Malfunction.(GM cars).
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Do you know what a serial data network is ? U codes are problems associated the data buss . A module isn't communicating or the buss wiring is shorted etc.....
Data Link Communications Description and Operation

Do you know what an how many modules are on your vehicle ?

The communication among control modules is performed primarily through the GMLAN high speed serial data circuit and the GMLAN low speed serial data circuits. The modules that need real time communication are attached to the high speed GMLAN network. The body control module (BCM) is the serial data gateway between the networks. The purpose of the gateway is to translate serial data messages between the GMLAN high speed buss and the GMLAN low speed buss. The controller area network (CAN) is another serial data communication network used on this vehicle which is dedicated to the electronic brake control module (EBCM) subsystem for stabilization. Below are more detailed descriptions of the individual networks. The gateway will interact with each network according to that network's transmission protocol. Refer to Body Control System Description and Operation for more information about the gateway.

Your best bet would be to take your vehicle to a qualified repair shop .

DTC U2100 00: Controller Area Network (CAN) Bus Communication
The GMLAN serial data circuits are controller area network (CAN) serial data buses used to communicate information between the control modules. Typical data transmission speeds must be high enough to ensure that a required real-time response is maintained. On this vehicle there are 2 totally different types of GMLAN serial data circuits, the high speed 2-wire circuit and low speed single wire circuit. Refer to Data Link Communications Description and Operation for the complete description of these buses. The GMLAN serial data circuits also communicate directly to the DLC connector. Messages are interpreted by the externally connected CANdi module which acts as a transceiver for the scan tool.
Modules connected to the GMLAN serial data circuits monitor communications during normal vehicle operation, where operation information is exchanged among the modules. All the modules on the GMLAN networks, maintain a transmit error counter (TEC) and a receive error counter (REC). The counter values increase with detected errors and will decrease with error-free messages. If the TEC value exceeds 255, the controller removes itself from the network and DTC U2100 will result.

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1 Answer

Code u2100


Means that the scan tool the shop uses can not communicate with your computer. This tells me that there is a broken or shorted wire somewhere between the connector and computer in your car, or the computer in your car is bad.

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U2100 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Off (4L30-E Transmission) Conditions
Cause Key on and the TCM detected a loss of communication on either Communication Area Network (CAN) Bus line for one second

--------
U2103 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Reset Counter Overrun (4L30-E Transmission)
Cause Key on and then the TCM detected a loss of communication on either CAN Bus line that exceeded 40 time out requirements


---------------
U2104 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Reset Counter Overrun (4L30-E Transmission)
Cause Key on and then the TCM detected a loss of communication on either CAN Bus line that exceeded 40 time out requirements
------------------
U2105 - GM Type Network - Manufacturer Controlled DTC - Manufacturer Controlled Description CAN Bus Error ECM (4L30-E Transmission) Conditions
Cause Key on and the TCM did not receive ECM messages for 1 second

BUT, THERE IS NO FAULT CODES RESULT FOR U2101 AND U2102
or you can ask the 24 hrs live technical support was multi-diag, they will like to help you, good luck

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U codes are network codes - issues with communication between modules. Start there, as these can cause funky things to happen and can set P codes, as well. Once the U code is resolved, clear them all and see if they come back.

U2100:
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