U0186Lost Communication With Audio Amplifier A
- Generic OBD-II code · Network
- How the car detects it
- U0186 means the external audio amplifier A has dropped off the bus; the radio or cluster store it, and the speakers usually go quiet. GM PIC6153 (Volt 2016 with premium audio) warns against replacing the amplifier and asks to inspect its X1 connector, especially pin 4 (B+) and pin 8 (ground). Chrysler bulletin 08-020-14 (Ram, Durango, Grand Cherokee 2013-2014) flashes the amplifier when it shows as absent in the wiTECH network view, after a power cycle via fuse F71. Mazda SA-070-22 (Mazda3, CX-30) traces U0186:08 to a backed-out MOST pin at the connectivity master unit, reproducible by tapping the dash. GM's Saab list calls it the speaker amplifier. Sound lost or crackling; no MIL. U0262 is amplifier B.
- What you may notice
- No sound or radio muted
- Crackling or intermittent audio
- Chimes or warning tones missing
- Likely causes
- LikelySpread or backed-out terminals at amplifier or head unit connector (GM, Mazda)
- PossibleAmplifier software stops bus communication, fixed by flash (Chrysler)
- PossibleAmplifier fuse blown or ground loose
- RareAudio amplifier A faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.