U0186 on Mazda vehicles
U0186 is named on 12 Mazda model years (2019–2024): 43 manufacturer filings and 0 owner reports in NHTSA’s files, across CX-30, Mazda3, CX-50.
Which Mazda model years name U0186
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2023 Mazda CX-30 | Electrical System | 4 | — |
| 2023 Mazda Mazda3 | Electrical System | 4 | — |
| 2022 Mazda CX-30 | Electrical System | 4 | — |
| 2022 Mazda Mazda3 | Electrical System | 4 | — |
| 2021 Mazda CX-30 | Electrical System | 4 | — |
| 2021 Mazda Mazda3 | Electrical System | 4 | — |
| 2020 Mazda CX-30 | Electrical System | 4 | — |
| 2020 Mazda Mazda3 | Electrical System | 4 | — |
| 2019 Mazda Mazda3 | Electrical System | 4 | — |
| 2024 Mazda CX-30 | Electrical System | 3 | — |
| 2024 Mazda Mazda3 | Equipment | 3 | — |
| 2023 Mazda CX-50 | Electrical System | 1 | — |
A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.
Mazda filings that name U0186
Source: NHTSA manufacturer communicationsBulletins and campaigns Mazda filed with NHTSA whose summary names U0186. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- SA-070-22 Service bulletin2022-11-01 · Electrical System
- Some customers may complain about intermittent audio no sound from the MAZDA CONNECT infotainment system and/or static noise from the speakers. The concern may be reproduced by tapping on the dash pad near the MAZDA CONNECT center display and the following DTC's may be stored. * U0186:08 Communication error with audio amplifier * U2145:08 Communication error with remote tuner (RT) * U2145:02 Co
- SA-021-24 Service bulletin2024-04-09 · Equipment — Electrical — Infotainment
- Some customers may complain about intermittent audio no sound from the MAZDA CONNECT infotainment system and/or static noise from the speakers. The concern may be reproduced by tapping on the dash pad near the MAZDA CONNECT center display and the following DTC's may be stored. U0186:08 Communication error with audio amplifier U2145:08 Communication error with remote tuner (RT) U2145:02 Communic
- SA-021-24a Other2024-05-07 · Structure — Body
- Some customers may complain about intermittent audio no sound from the MAZDA CONNECT infotainment system and/or static noise from the speakers. The concern may be reproduced by tapping on the dash pad near the MAZDA CONNECT center display and the following DTC's may be stored. U0186:08 Communication error with audio amplifier U2145:08 Communication error with remote tuner (RT) U2145:02 Communicati
- SA-008-25 Service bulletin2025-02-05 · Electrical System
- Some customers may complain about intermittent audio no sound from the MAZDA CONNECT infotainment system and/or static noise from the speakers. The concern may be reproduced by tapping on the dash pad near the MAZDA CONNECT center display and the following DTC's may be stored. U0186:08 Communication error with audio amplifier • U2145:08 Communication error with remote tuner (RT) • U2145:02 Communi
- SA-058-22 Service bulletin2022-08-19 · Electrical System
- Some customers may expierience infotainment static or no audio sound and the following DTC's may be stored: - U2145:08 - Communication error with remote tuner (RT) - U0186:08 - Communication error with audio amplifier This may be caused by poor electrical connection at connector 0920-114 and/or 0920-115D (Rear Harness Side).
What U0186 means
Source: SAE J2012 / OBD-IIU0186 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
A stored code names the test that failed, never the part that caused it. The record above is what Mazda and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs U0186 a known problem on Mazda vehicles?
It is a documented one: NHTSA's files hold 43 manufacturer filings and 0 owner reports naming U0186 on 12 Mazda model years (2019–2024). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which Mazda models does U0186 appear on most?
2023 CX-30 (4 documents), 2022 CX-30 (4 documents), 2021 CX-30 (4 documents).
Does U0186 on a Mazda mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.