What it means
A receiving module detected implausible data from the audible alert control module (chimes, AVAS pedestrian alert, warning tones). Tone request or volume values fail plausibility checks and are rejected.
How it works
The receiving module checks messages from the audible alert control module, which manages chimes, warning tones, or an acoustic vehicle alert system (AVAS). U0461 sets when a tone request or volume value fails plausibility checks and is rejected.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and save freeze-frame data to identify which module logged U0461 and whether alert-system or communication codes are present.
- Check live tone-request and volume data from the audible alert control module for missing or implausible values, and confirm which alerts or sounds are affected.
- Inspect the module's connectors, wiring, power, and grounds, including accessible connections to the alert speaker, for damage or loose terminals.
- Check whether the fault began after module replacement or a software update, then verify the module's configuration and software compatibility.
- If invalid messages continue, check CAN communication and gateway routing, then test the alert module and its inputs using the manufacturer's diagnostic procedure.
Common fixes
- Repair loose or damaged audible alert module connectors or wiring.
- Correct an alert-module configuration or software mismatch after replacement or an update.
- Repair a faulty speaker connection or input circuit if testing identifies one.
- Repair CAN or gateway faults affecting alert-module messages.
- Replace the audible alert control module if its internal fault is confirmed.
Can I keep driving?
The vehicle may lose chimes, warning tones, or its pedestrian alert, so do not assume an audible warning will be heard. Drive attentively and check the instrument display for warnings; arrange diagnosis promptly, especially if the vehicle uses an AVAS.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.