Network, generic

U0487 Invalid Data Received From Audio Amplifier A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Backed-out or spread pin in the amplifier or MOST connector
Amplifier software level not matching the head unit
Poor supply or ground at the amplifier

Symptoms

  • No sound or radio muted
  • Static or crackling from the speakers, sometimes when tapping the dash

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–700
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

audio amplifier a

Related codes

U0186U0563U0262U0485

References: static.nhtsa.gov, static.nhtsa.gov, saabwisonline.com.