U0323 on Mazda vehicles
U0323 is named on 21 Mazda model years (2016–2019): 48 manufacturer filings and 0 owner reports in NHTSA’s files, across CX-3, CX-5, CX-9, MX-5, Mazda3 and 1 more.
Which Mazda model years name U0323
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2016 Mazda CX-3 | Tires | 3 | — |
| 2016 Mazda CX-5 | Tires | 3 | — |
| 2016 Mazda CX-9 | Electrical System | 3 | — |
| 2016 Mazda MX-5 | Electrical System | 3 | — |
| 2016 Mazda Mazda3 | Electrical System | 3 | — |
| 2016 Mazda Mazda6 | Electrical System | 3 | — |
| 2019 Mazda CX-3 | Electrical System | 2 | — |
| 2019 Mazda CX-5 | Electrical System | 2 | — |
| 2019 Mazda CX-9 | Tires | 2 | — |
| 2019 Mazda MX-5 | Electrical System | 2 | — |
| 2018 Mazda CX-3 | Electrical System | 2 | — |
| 2018 Mazda CX-9 | Electrical System | 2 | — |
| 2018 Mazda MX-5 | Tires | 2 | — |
| 2018 Mazda Mazda3 | Electrical System | 2 | — |
| 2018 Mazda Mazda6 | Tires | 2 | — |
| 2017 Mazda CX-3 | Electrical System | 2 | — |
| 2017 Mazda CX-5 | Electrical System | 2 | — |
| 2017 Mazda CX-9 | Electrical System | 2 | — |
| 2017 Mazda MX-5 | Tires | 2 | — |
| 2017 Mazda Mazda3 | Tires | 2 | — |
| 2017 Mazda Mazda6 | Tires | 2 | — |
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 U0323
Source: NHTSA manufacturer communicationsBulletins and campaigns Mazda filed with NHTSA whose summary names U0323. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- MT-010-18 Service bulletin2018-11-27 · Tires — Pressure Monitoring And Regulating Systems
- Some vehicles (with MAZDA CONNECT) may exhibit a condition where DTC U0323(PCM) / U0423(ABS) /U3000(IC) CANNOT be deleted when the TPMS warning light flashes and/or the TCS/DSC indicator lights are illuminated. This can happen if the ignition is turned OFF within 20 seconds after the ignition is turned ON in one of the following two situations. 1. The ?ROOM? fuse (Engine compartment) is NOT instal
- MT-010-18 Service bulletin2018-11-27 · Electrical System
- Some vehicles (with MAZDA CONNECT) may exhibit a condition where DTC U0323(PCM) / U0423(ABS) /U3000(IC) CANNOT be deleted when the TPMS warning light flashes and/or the TCS/DSC indicator lights are illuminated. This can happen if the ignition is turned OFF within 20 seconds after the ignition is turned ON in one of the following two situations. 1. The ?ROOM? fuse (Engine compartment) is NOT instal
- MTI_1137 Service bulletin2016-11-03 · Equipment — Other — Owners/Service/Other Manual
- Mulri-Model (Equipped with Mazda connect) - DTC U0323/U0423/U3000 Cannot be deleted (Update)
What U0323 means
Source: SAE J2012 / OBD-IIU0323 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 U0323 a known problem on Mazda vehicles?
It is a documented one: NHTSA's files hold 48 manufacturer filings and 0 owner reports naming U0323 on 21 Mazda model years (2016–2019). 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 U0323 appear on most?
2016 CX-3 (3 documents), 2016 CX-5 (3 documents), 2016 CX-9 (3 documents).
Does U0323 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.