U0015 indicates the Medium Speed CAN (Controller Area Network) communication bus is open, meaning the bus is not receiving a proper signal from its primary controller.
The primary controller that drives the Medium Speed CAN bus may have failed, causing the bus to be open.
Cracked, frayed, or severed wires in the Medium Speed CAN bus harness can interrupt communication.
Corrosion or poor contact at connectors along the Medium Speed CAN bus path can break the signal.
Insufficient or unstable voltage supplied to the Medium Speed CAN controller can prevent it from functioning.
In rare cases, a fault in the powertrain control module may prevent it from driving the Medium Speed CAN bus, but this is uncommon.
No, the PCM is rarely the cause of an open Medium Speed CAN bus. The issue is almost always a wiring, connector, or controller fault.
Resetting the code will only hide the symptom temporarily. If the underlying fault remains, the code will return after a few drive cycles.
An open Medium Speed CAN bus can prevent proper sensor data transmission, which may lead to higher emissions or a failure to meet emissions standards.