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Obd2 code u2100 - 2005 Cadillac STS

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How to test the obd codes


What is year--make--model? Generally 94 model year and older is obd1. 96 and newer is obd2, generally. 95 can be a cross-over year and could have a hybrid diagnostic connector.

Usually with obd2, you need an obd2 code reader. OBD1 you should be able to access some codes, yourself, w/o a code reader. Different makes can have different procedures for accessing codes/obd1.

Mar 05, 2015 | Cars & Trucks

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.

Dec 03, 2013 | 2005 Chevrolet Cobalt

1 Answer

Vauxhall fault codes


in my car Vauxhall zafira this cod comes up which is u2100c and can u please tell me how to fix the problem , I change the car key battery . still the light is there.

Nov 29, 2013 | 2006 Opel Zafira 1.9

2 Answers

0N A 2013 FORD MUSTANG GETTING CODES 0028 & U2100 WHAT DO THESE MEAN?


U2100 has to do with restraint control module. It should all be under warranty

Nov 27, 2013 | Ford Mustang Cars & Trucks

1 Answer

Code u2100- u2105


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

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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


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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
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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

Aug 14, 2013 | 2005 Isuzu Ascender

1 Answer

Having trouble with a 2005 cobalt. Sometimes car just goes crazy tranmission shifting weird codes are U2100,po700 and po742 think it is in the can bus but dont know were to start?


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:
"Key on and the TCM (transmission control module) detected a loss of communication on either Communication Area Network (CAN) Bus line for one second"

May 09, 2011 | Chevrolet Cobalt Cars & Trucks

1 Answer

Replaced the O2 sensor unit and the ECM(programs installed) but I'm still getting CHECK ENGINE LIGHT(P0001). what is the possible problem and how can this be resolved?


P0001 Fuel Volume Regulator Control Circuit/Open The above code is about an oxygen sensor code for the heater circuit located in bank 1 sensor 1. (bank 1 is at exhaust manifold by the #1 cylinder head, bank 2 is on the 2nd cylinder head. On some engines, both exhaust manifolds could have one oxygen sensor each side and the 2nd cylinder head will have the sensor 2). On the oxygen sensor itself, it has 4 wires which are color coded. Two of wires are for the heater circuit that heats the oxygen sensor to make it reach optimum operation quickly. Those 2 oxygen sensor heater wires could be shorted between the sensor and the ecm (engine computer) or other engine components.
oxygen%20sensor%20heater%20copy.jpgThe common fix for this code is to check the integrity of the heater wires. Check the wires for insulation and routing which could be loose or touching a hot exhaust that can short the wires. If the engine has too many miles, it is possible that the heater circuit inside is worn and shorted which needs a replacement of the oxygen sensor. If you have a DVOM, you can also test the continuity of the heater wires from the oxygen sensor to your computer pins.
More detailed fixes will be provided as soon as you give the symptoms of the obd2 trouble code. ATS will provide the wiring diagram so you can trace the color coded wires. Use an obd2 code reader or scanner so you can access this obd2 trouble code. When you have this obd2 code list, use it as a reference and give the code to ATS. We will then send you all the possible fixes for the obd2 trouble code. ATS has lots of fixes for obd2 gm codes, obd2 ford codes, dodge obd2 codes and all obd2 import codes such as Toyota obd2 codes, Honda obd2 codes, Nissan obd2 codes, etc. All fixes for this obd2 codes are guaranteed or your money back.
Important TIPS about Oxygen sensor:
The oxygen sensor content of the exhaust gas indicates when the engine mixture is operating lean or rich. When the oxygen sensor detects that the engine is operating rich, the signal voltage is high, and any decreases in the signal voltage means the engine running is lean. The engine computer supplies a reference voltage like one volt or five volts, and then shows the change in the sensor return voltage as the sensor's resistance is changing. If you have connected everything properly, when you crank the engine, you should see the check engine light coming out.
Unheated oxygen sensors rely on the heat of the exhaust gases to reach the working temperature, therefore they might start to cool down while the engine is idling and revert back to a default air-fuel ratio setting. This type of sensor usually has a single wire connector, though others have two. Unlike the fuel pump relay, the 02 sensor heater circuits have a separate fuse for each sensor and grounds, which are controlled by the engine computer.
To read a voltage across the heater, one side must be connected to (+) and one side must be connected to (-), which is accomplished by the computer or a transistor. It can read 12V between each wire and a separate ground if it was connected to positive and the other was not yet connected to ground connection (for details, please contact ATS).after you replace oxygen sensor you have to drive for so many miles before it resets its sef

Dec 13, 2010 | 2001 Volkswagen Beetle

1 Answer

How do I pull codes from a 2000 Toyota Camry 6 cylinder?


You must use an OBD2 reader, OBD2 vehicles do not support self-diagnosis. OBD2 vehicles are years 1996-present!! Bring your vehicle to your local autozone, they would read the codes for free!!

Sep 30, 2010 | Toyota Camry Cars & Trucks

1 Answer

What does an error code u2100 mean


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

Oct 19, 2009 | 2005 Saturn ION

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