U0487 code meaning
Invalid Data Received From Audio Amplifier A
What U0487 means
U0487 means the external audio amplifier A keeps sending frames, but the radio or gateway finds their content invalid; once the amplifier vanishes from the bus, U0186 applies, and amplifier B has U0262 and U0563. Amplifiers return status such as mute state, sound settings and diagnostic results to the head unit. No manufacturer documents U0487 publicly. Mazda files faulty amplifier messages under U0186 with failure type 08 instead: on the 2019-2023 Mazda3 and CX-30 (SA-070-22) a backed-out pin in the MOST connector of the connectivity master unit caused it, together with static. Chrysler 08-020-14 reflashed amplifiers on 2013-2014 Ram, Durango and Grand Cherokee when the radio was muted because the amplifier went quiet. GM's Saab list calls the unit speaker amplifier module. Sound may mute or crackle; no MIL.
U0487 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0487
- No sound or radio muted
- Static or crackling from the speakers, sometimes when tapping the dash
Common causes of U0487
- Most likelyBacked-out or spread pin in the amplifier or MOST connector
- PossibleAmplifier software level not matching the head unit
- Less likelyPoor supply or ground at the amplifier
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Audio amplifier a
What each part of U0487 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 87 | The exact fault in that area. |
What to do next
- Note U0487 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0487
What does U0487 mean?
U0487 means "Invalid Data Received From Audio Amplifier A". U0487 means the external audio amplifier A keeps sending frames, but the radio or gateway finds their content invalid; once the amplifier vanishes from the bus, U0186 applies, and amplifier B has U0262 and U0563. It is a generic code, so it means the same on every make.
Is it safe to drive with U0487?
U0487 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0487 fail an emissions test?
U0487 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0487 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U0487 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.