U0515 signals that the vehicle's control modules are not receiving valid data from the Remote Function Actuation (RFA) module, which manages remote functions such as keyless entry. This is a communication fault on the CAN network. The code is triggered when the data exchange between modules fails or is corrupted.
The RFA module may have an internal fault that prevents it from transmitting valid data over the CAN bus.
Corroded, loose, or broken wires and connectors between the RFA module and other modules can corrupt data signals.
A malfunctioning module on the same CAN network can generate erroneous messages that trigger the U0515 code.
If the connectors at the RFA module or at the PCM are not fully engaged or are corroded, data transmission may fail.
A PCM failure can cause it to misinterpret data, but this is rare for U0515; the module is usually not the root cause.
No, the PCM is rarely the cause; most often the issue is wiring, a bad RFA module, or a faulty communication connector.
A standard OBD‑II scanner can read the code, but deeper network diagnostics may require a tool that can access module data streams.
Repair time depends on the cause; wiring repairs may take a few hours, while module replacement can require a full day including programming.
Yes, once the underlying fault is resolved and the code is cleared with a scan tool, it will not return unless the issue recurs.