Question about 2004 Mazda RX-8
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Posted on Jan 02, 2017
The U0100 code means there is Loss in communication with the ECM/PCM,which might be as a result of one of the following reasons listed below.
1. You had flash downloads applied to your vehicle. Many erroneous DTC codes are generated during flashing and should be cleared after flashing 2. You disconnected/reconnected computers in the car with the power still applied 3. An interruption (break or short) in the CAN network caused communication errors.
a simple software update will help you resolve the issue.
Posted on Aug 28, 2010
SOURCE: I had my 2004 Mazda
Codes that begin with the letter U are always communication fault codes between modules in a CAN system. They are basically to be ignored unless a problem is occuring. This is because all of the control modules in your car ( and there are a bunch of them ) are all communicating to each other and sending information between each other on one set of wires called a "twisted pair" Due to the high volume of infomation being sent and received there is the invevitable time when a message will be sent from one module to another and it is lost or not responded to in a timely manner (meaning in milliseconds) When this occurs then a U0100 or other comm fault code is stored.
Posted on May 20, 2011
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