U0563 Low Generic / SAE

U0563: Invalid Data Received From Audio Amplifier B

Network and Communication Invalid Data Received (continued)

What to do

The car drives normally. You may have lost sound from part of the system — often the bass, if this is a subwoofer amplifier.

Check for damp: boot floor, under the seats, in the spare wheel well. Amplifiers get mounted wherever there is room, which tends to be exactly where water collects. A wet boot and an amplifier fault are usually one problem, and finding the leak matters more than the module.

Make sure the amplifier is not buried. If it is under a seat or in the boot with luggage packed against it, it cannot get rid of its heat — and a unit that cuts out when worked hard and recovers later is telling you that rather than failing.

If the stereo has been changed for an aftermarket unit, mention it. Factory amplifiers expect to be spoken to in a particular way, and this code is what happens when they are not.

What this code means

Audio amplifier B is broadcasting data that cannot be accepted as true. See U0400 for what an invalid-data code is and why the module it names is usually the messenger rather than the culprit.

A second amplifier means a system with separated channels — a premium package with its own subwoofer amplifier, a rear-zone amplifier, or a vehicle large enough to need distributed power. See U0538 for the family; this adds what is specific to a second unit.

Amplifiers are mounted for space rather than for dryness, and the second one usually gets the worse location — under a seat, in a boot side panel, behind a wheel arch liner, beneath the parcel shelf. All of those are places water reaches, from a blocked sunroof drain, a failed tailgate seal, or a spare wheel well that has been quietly full since the last time the car was washed.

So a damp carpet and an amplifier code are one fault, and the leak matters more than the module.

Heat is the second cause, and it is self-inflicted. An amplifier under a seat with a bag pushed against it, or one in a boot buried under luggage, cannot shed heat. A unit that misbehaves when it is worked hard and recovers when it cools is describing that, not an electrical fault.

And the aftermarket case is strong: a replacement head unit that does not speak the factory amplifier's protocol leaves it reporting states nothing understands.

Likely causes

Start here

Corroded or loose connector · easy
Damaged data bus wiring · moderate

Less common

Module not coded to the vehicle · specialist
Water ingress into module · moderate
Damaged wiring harness · moderate
Aftermarket head unit fitted in place of the original · moderate

Symptoms

Components involved

Information, not instruction

CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.

Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.

Community experience

Be the first to write this up

Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.

What makes one worth reading:

The car — make, model, year and engine. The same fault behaves differently on each.
What you measured, not only what you replaced.
What actually fixed it — or that nothing did, which is worth knowing too.