U0012, U0013, U0014, U0015, U0016, and U0017: Medium Speed CAN Communication Bus

DTC error codes are diagnostic trouble codes that indicate a problem with the vehicle’s system or components. They are usually displayed on the dashboard or scanned by a code reader. In this article, we will focus on six specific DTC error codes: U0012 to U0017. These codes are related to the medium speed controller area network (CAN) communication bus of the vehicle.

Have you ever encountered a check engine light on your dashboard, or noticed some problems with your radio, climate control, or instrument cluster? If so, you may have a faulty medium speed CAN communication bus in your vehicle. This is a network that connects various devices and modules without a host computer, and transmits data bits by creating a voltage differential between two wires. In this article, we will explain what a medium speed CAN communication bus is, what are the DTC error codes U0012 to U0017 that indicate a problem with it, what are the possible causes and symptoms of these codes, and how to diagnose and repair them. By reading this article, you will learn how to fix your vehicle’s network and performance issues.

What is a Medium Speed CAN Communication Bus?

A medium speed CAN communication bus is a part of the vehicle network that connects various devices and modules without a host computer. The CAN bus uses two wires, called CAN high and CAN low, to transmit data bits by creating a voltage differential between them. The CAN bus operates at different speeds, depending on the type and function of the devices. The medium speed CAN bus is used for devices that are not critical for vehicle operation, such as the radio, climate control, instrument cluster, etc.

What Do U0012 to U0017 Mean?

U0012 to U0017 are DTC error codes that mean there is a problem with the medium speed CAN communication bus circuit. Each code indicates a different type of fault in the circuit, as follows:

• U0012: Medium Speed CAN Communication Bus (+) Open
• U0013: Medium Speed CAN Communication Bus (+) Low
• U0014: Medium Speed CAN Communication Bus (+) High
• U0015: Medium Speed CAN Communication Bus (-) Open
• U0016: Medium Speed CAN Communication Bus (-) Low
• U0017: Medium Speed CAN Communication Bus (-) High

These codes mean that there is either an open circuit, a short circuit, or a poor electrical connection in the medium speed CAN communication bus circuit. This can affect the functionality and communication of some or all of the devices connected to the medium speed CAN bus.

What are the Possible Causes of U0012 to U0017?

There are several possible causes of these DTC error codes, such as:

• Faulty or damaged medium speed CAN bus devices or modules
• Faulty or damaged wiring harness or connectors
• Shorted or open circuit
• Poor electrical connection
• Interference from other sources

What are the Symptoms of U0012 to U0017?

Some of the symptoms that may indicate these DTC error codes are:

• Check engine light on
• No communication with some or all of the medium speed CAN bus devices or modules
• Loss of functionality of some or all of the medium speed CAN bus devices or modules
• Erratic or incorrect data displayed on the instrument cluster

How to Fix U0012 to U0017?

To fix these DTC error codes, you need to perform some diagnostic steps, such as:

• Scan the vehicle with a code reader and record the freeze frame data
• Clear the codes and test drive the vehicle to see if they reappear
• Visually inspect the medium speed CAN bus devices, wiring harness, and connectors for any damage or corrosion
• Check for continuity and resistance in the medium speed CAN bus circuit using a multimeter
• Check for voltage and ground in the medium speed CAN bus circuit using a test light
• Replace or repair any faulty components as needed
• Re-scan the vehicle and verify if the codes are cleared

Conclusion

U0012 to U0017 are DTC error codes that indicate a problem with the medium speed CAN communication bus circuit. This circuit connects various devices and modules without a host computer and transmits data bits by creating a voltage differential between two wires. If there is a problem with this circuit, some or all of the devices connected to it may not function or communicate properly. To fix these codes, you need to diagnose and repair any faulty components in the medium speed CAN communication bus circuit. By doing so, you can restore your vehicle’s network and performance.

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