U3000 on Mazda vehicles

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.

Owners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.

Bulletins and campaigns Mazda filed with NHTSA whose summary names U3000. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• SA-044-21 Service bulletin
  2021-07-13 · Service Brakes, Hydraulic
• When switching to the maintenance mode, U3000:53 and the related DTCs are stored, but the DTCs will not be cleared automatically after finishing the maintenance mode. It is necessary to clear the DTCs completely after performing the brake system maintenance mode. DTC codes: U3000:53, C0021:52, U0415:68
• 15-003/22 Service bulletin
  2022-01-27 · Electrical System
• Some vehicle may experience the i-ACTIVSENSE/ALH warning lights on and a system error messages may be found in the center display as well. DTC U3000:04 (FSC) is stored in memory DTC U3000:04 (FSC) - Forward sensing camera (FSC) internal malfunction This may be caused by a hardware failure in an internal device of the FSC that results in the malfunction detection. To eliminate this concern, the
• 16-001-22d Service bulletin
  2022-11-01 · Electrical System
• Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7000C0A-NA01_12004 or later). Ver. 7000C0A-NA01_12004 fixes these software errors (bugs): * Album artwork may not appear when playing music using an USB connected iPhone. * The center display may turn black when the gear is shifted from reverse position to parking position. *
• SA-029-20a Service bulletin
  2020-04-08 · Electrical System
• Some customers may experience a "IN-VEHICLE NETWORK MALFUNCTION" warning message in the instrument cluster with one or more of the following DTC's stored:  B119F:01 TCU - Tel antenna No. 1 malfunction  B1252:87 TCU - Communication error with connectivity master unit (CMU)  U0156:00 VCM - Communication error with connectivity master unit (CMU)  U0156:00 BCM - Communication error with c
• SA-0290-20c Service bulletin
  2020-06-05 · Equipment — Electrical
• Some customers may experience a "IN-VEHICLE NETWORK MALFUNCTION" warning message in the instrument cluster with one or more of the following DTC's stored:  B119F:01 TCU - Tel antenna No. 1 malfunction  B1252:87 TCU - Communication error with connectivity master unit (CMU)  U0156:00 VCM - communication error with connectivity master unit (CMU)  U0156:00 BCM - Communication error with
• SA-029-20d Service bulletin
  2020-06-23 · Equipment — Electrical
• Some customers may experience a "IN-VEHICLE NETWORK MALFUNCTION" warning message in the instrument cluster with one or more of the following DTC's stored: B119F:01 TCU - Tel antenna No. 1 malfunction  B119F:13 (TCU - TEL antenna No.1 circuit malfunction)  B119F:2B (CMU - GPS antenna signal circuit malfunction)  B1252:87 TCU - Communication error with connectivity master unit (CMU) 
• 09-001-23 Service bulletin
  2023-01-03 · Electrical System
• Some vehicles may exhibit DTC U3000:04 (Telematics communication unit internal malfunction) stored after the connected service contract has been discontinued (only vehicles in which the customer opted out of CV services are affected - CSP04). This is caused by improper control software of telematics communication unit. To eliminate this concern, the control software of telematics communication uni
• SA-027-23 Service bulletin
  2023-04-28 · Electrical System
• In-Vehicle Network Malfunction error message. DTC U3000:04 (Telematics communication unit internal malfunction) stored. NOTE: The vehicle does not apply to 09-001/23 because CSP04 is not "OPEN".
• 15-002-21-3812 Service bulletin
  2021-07-09 · Electrical System
• Some customers may experience a SBS/SCBS, LAS/LDWS and/or HBC warning light on. A system error message may also be found in the center display. DTC U3000:04-0A (Forward sensing camera (FSC) internal malfunction). DTC U3000:04-0A (Forward sensing camera (FSC) internal malfunction) is stored in the FSC module and cannot be erased. This concern may be caused by a hardware failure of an internal devic
• SA-027-23a Service bulletin
  2023-06-13 · Equipment Adaptive/Mobility
• IN-VEHICLE NETWORK MALFUNCTION AND MASTER WARNING LIGHT ON. DTC U3000:04 STORED (DOES NOT APPLY TO 09-001/23)
• 15-006-17-3388 Service bulletin
  2017-10-06 · Electrical System
• Some customers may complain about one or more warning lights ON when they start the vehicle during hot weather. The following DTCs are stored in memory: U3000:98 - Forward sensing camera (FSC) stops functioning due to temporary high temperature. U3000:04 - Forward sensing camera (FSC) internal malfunction. The combination of warning lights mentioned by the customer may include: Instrument Cluster
• 15-006-17-3388a Service bulletin
  2017-12-22 · Electrical System
• Some customers may complain about one or more warning lights ON when they start the vehicle during hot weather. The following DTCs are stored in memory: U3000:98 - Forward sensing camera (FSC) stops functioning due to temporary high temperature. U3000:04 - Forward sensing camera (FSC) internal malfunction. The combination of warning lights mentioned by the customer may include:

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.