The first two steps are about getting as much information as you can and eliminating possibilities. Typically, it’s going to be caused by a bad PCM or module. There isn’t a whole lot that someone who hasn’t dealt with a code like this before can do. If the problem is intermittent, your Astra may run and die randomly at any time.īeing that the vehicle can run and die at any time, even if it starts back up after getting this code, we recommend having a mechanic look at it before driving it again.The check engine light will be illuminated.Crank but no start, or no start and no crank.Think about it like your Astra’s brain not being able to talk to its hands, legs, or another appendage. When one of these modules loses communication with the PCM, the code U0100 will present itself. Many older vehicles combined the PCM and TCM into one unit. The newer it is, the more likely it is that more modules are communicating with the PCM. There can be as many as 18 of these modules. PCM (Powertrain Control Module) or ECM (Engine Control Module).The CAN bus connects the PCM to all of the complicated control systems that a modern vehicle has, such as: In most cases, this wiring is referred to as CAN bus. Your Opel Astra’s main computer (known as the ECM or PCM) uses a series of wiring harnesses and CAN bus hubs to communicate with the various modules. U0100 Definition: Lost Communication With ECM/PCM “A” It can be an exceptionally difficult code to diagnose. The most common causes of U0100 are a bad PCM/ECM or TCM.
When a vehicle has U0100, most of the time, it won’t run or drive anywhere. This code tells you that communication has been lost between the ECM/PCM (main computer) and a particular control module has been completely lost. U0100 is a generic diagnostic trouble code, meaning it has the same definition for any vehicle made in the 1996 model year or newer (including the Opel Astra).
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