Control unit communication error
Signal failures happen when control units can't communicate, causing issues.
Costs
Every car issue can be caused by different things. Here are the most common ones
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Most Expensive
Moderate costs
Cheapest case
Discussions
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Details
Probability
Based on the values and symptoms you have entered, a crude estimation of the probability of this problem can be made
HIGH
Typical consequences
If this defect is detected, it may lead to the following problems:
- Malfunction of the vehicle electronics
Function of control unit communication
Modern passenger cars contain up to 50 electronic control units that communicate with each other. Since normal wiring would be too large and heavy, these are networked via a bus system. The CAN bus is the most widely used in the automotive sector.
It is a bidirectional system that enables serial data exchange between up to 128 control units. With only two lines (CAN-HIGH and CAN-LOW), the engine control unit, for example, can communicate with the transmission control unit. An optional ground line (CAN-GND) is usually provided via the vehicle body.