U0487Invalid Data Received From Audio Amplifier A
- Generic OBD-II code · Network
- How the car detects it
- 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.
- What you may notice
- No sound or radio muted
- Static or crackling from the speakers, sometimes when tapping the dash
- Likely causes
- LikelyBacked-out or spread pin in the amplifier or MOST connector
- PossibleAmplifier software level not matching the head unit
- RarePoor supply or ground at the amplifier
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.