Diagnostic trouble code U0497 indicates that a control module on the vehicle network received invalid or missing data from the Rear Entertainment Control Module. This is a communication fault, not necessarily a component failure, and often stems from the entertainment module itself or its wiring.
The module itself is the most common cause. Internal electronic failure, corrupted software, or a failed processor can prevent it from sending valid data on the network.
Damaged, corroded, or loose wiring or connectors at the rear entertainment module can interrupt communication. This includes broken wires in the harness or poor pin contact.
Insufficient voltage to the module (due to a weak battery, poor ground, or faulty fuse) can cause it to send invalid data or fail to respond.
An aftermarket radio, amplifier, or other device improperly connected to the vehicle network can corrupt data signals and trigger this code.
A software update or replacement of another module (e.g., radio, amplifier) may create a mismatch that the rear entertainment module cannot handle, leading to invalid data.
The powertrain control module is rarely the cause. Only consider this if multiple unrelated modules report communication errors and all other possibilities have been exhausted.
No. The PCM is almost never the cause of this code. U0497 specifically points to the Rear Entertainment Control Module, not the PCM. Replacing the PCM is a common misdiagnosis and will not fix the problem unless there is a rare, widespread network fault.
Yes. Low battery voltage can cause modules to send corrupted data or fail to communicate properly. Always check the battery condition and charge before replacing any parts.
Generally yes. The code affects only the rear entertainment system, not engine or safety systems. However, if other communication codes are present, drivability issues may occur. Have it diagnosed soon to prevent further problems.
Temporarily, yes. Disconnecting the battery may clear the code if it was caused by a transient glitch. However, if the underlying fault remains, the code will return. This is a diagnostic step, not a repair.