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Service bulletins for the 2020 Mazda Mazda3

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

726 on file from NHTSA, as of 2026-10-19.

About B1252 on the 2020 Mazda Mazda3: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: B1252 are shown. Show all

Bulletins, newest first
SA-029-20g2020-10-05. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. 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)• U0156:00 VCM - Communication error with connectivity master unit (CMU)• U0156:00 BCM - Communication error with connectivity master unit (CMU)• U0198:00 BCM - Communication error with emergency call unit• U212D:00 BCM - Communication error with light control module (RH)• U3000:00 TCU - Telematics communication unit internal malfunction• Low Voltage Battery DTCs
SA-029-20e2020-07-03. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT:ELECTRICAL; 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 • 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) • U0156:00 VCM - communication error with connectivity master unit (CMU) • U0156:00 BCM - Communication error with connectivity master unit (CMU) • U0198:00 BCM - Communication error with emergency call unit • U212D:00 BCM - Communication error with light control module (RH) • U3000:00 TCU - Telematics communication unit internal malfunction • Low Voltage Battery DTCs
SA-029-20d2020-07-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. 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) • U0156:00 VCM - communication error with connectivity master unit (CMU) • U0156:00 BCM - Communication error with connectivity master unit (CMU) • U0198:00 BCM - Communication error with emergency call unit • U212D:00 BCM - Communication error with light control module (RH) • U3000:00 TCU - Telematics communication unit internal malfunction • Low Voltage Battery DTCs
SA-0290-20c2020-07-03. Service bulletin. EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM:SOFTWARE. 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 connectivity master unit (CMU) • U0198:00 BCM - Communication error with emergency call unit • U212D:00 BCM - Communication error with light control module (RH) • U3000:00 TCU - Telematics communication unit internal malfunction • Low Voltage Battery DTCs
SA-029-20a2020-05-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. 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 connectivity master unit (CMU) • U0198:00 BCM - Communication error with emergency call unit • U212D:00 BCM - Communication error with light control module (RH) • U3000:00 TCU - Telematics communication unit internal malfunction • Low Battery DTCs
SA-029-202020-02-27. Service bulletin. 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 connectivity master unit (CMU) U0198:00 BCM - Communication error with emergency call unit U212D:00 BCM - Communication error with light control module (RH) U3000:00 TCU - Telematics communication unit internal malfunction

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.