Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2021 Mazda 6 Carbon EditionFACTORY OEM SERVICE PROCEDURE

Connectivity Master Unit DTCS

CONNECTIVITY MASTER UNIT DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC No.	Refer to
B1087:87	(See DTC B1087:87 [CONNECTIVITY MASTER UNIT] .)
B108E:04	(See DTC B108E:04 [CONNECTIVITY MASTER UNIT] .)
B108E:06	(See DTC B108E:06 [CONNECTIVITY MASTER UNIT] .)
B108E:1C	(See DTC B108E:1C [CONNECTIVITY MASTER UNIT] .)
B108E87	(See DTC B108E:87 [CONNECTIVITY MASTER UNIT] .)
B116A:11	(See DTC B116A:11 [CONNECTIVITY MASTER UNIT] .)
B116A:12	(See DTC B116A:12 [CONNECTIVITY MASTER UNIT] .)
B116A:92	(See DTC B116A:92 [CONNECTIVITY MASTER UNIT] .)
B119F:11	(See DTC B119F:11 [CONNECTIVITY MASTER UNIT] .)
B119F:13	(See DTC B119F:13 [CONNECTIVITY MASTER UNIT] .)
B119F:1D	(See DTC B119F:1D [CONNECTIVITY MASTER UNIT] .)
B119F:92	(See DTC B119F:92 [CONNECTIVITY MASTER UNIT] .)
B11BA:11	(See DTC B11BA:11 [CONNECTIVITY MASTER UNIT] .)
B11BA:15	(See DTC B11BA:15 [CONNECTIVITY MASTER UNIT] .)
B1201:11	(See DTC B1201:11 [CONNECTIVITY MASTER UNIT] .)
B1201:15	(See DTC B1201:15 [CONNECTIVITY MASTER UNIT] .)
B1238:01	(See DTC B1238:01 [CONNECTIVITY MASTER UNIT] .)
B1238:16	(See DTC B1238:16 [CONNECTIVITY MASTER UNIT] .)
B1238:87	(See DTC B1238:87 [CONNECTIVITY MASTER UNIT] .)
B1252:09	(See DTC B1252:09 [CONNECTIVITY MASTER UNIT] .)
B1252:1D	(See DTC B1252:1D [CONNECTIVITY MASTER UNIT] .)
B1252:87	(See DTC B1252:87 [CONNECTIVITY MASTER UNIT] .)
B12B8:1D	(See DTC B12B8:1D [CONNECTIVITY MASTER UNIT] .)
B12B8:8712	(See DTC B12B8:87 [CONNECTIVITY MASTER UNIT] .)
B12BD:11	(See DTC B12BD:11 [CONNECTIVITY MASTER UNIT] .)
B12BD:87	(See DTC B12BD:87 [CONNECTIVITY MASTER UNIT] .)
B1A89:13	(See DTC B1A89:13 [CONNECTIVITY MASTER UNIT] .)
B1A89:42	(See DTC B1A89:42 [CONNECTIVITY MASTER UNIT] .)
U0001:88	(See DTC U0001:88/U0100:00/U0101:00/U0104:00/U0121:00/U0131:00/U0140:00/U0151:00/U0155:00/U0182:00/U0214:00/U0235:00/U023A:00 [CONNECTIVITY MASTER UNIT] .)
U0028:88	(See DTC U0028:88 [CONNECTIVITY MASTER UNIT] .)
U0100:00	(See DTC U0001:88/U0100:00/U0101:00/U0104:00/U0121:00/U0131:00/U0140:00/U0151:00/U0155:00/U0182:00/U0214:00/U0235:00/U023A:00 [CONNECTIVITY MASTER UNIT] .)
U0101:00
U0104:00
U0121:00
U0131:00
U0140:00
U0151:00
U0155:00
U0182:00
U0184:00	(See DTC U0184:00 [CONNECTIVITY MASTER UNIT] .)
U0214:00	(See DTC U0001:88/U0100:00/U0101:00/U0104:00/U0121:00/U0131:00/U0140:00/U0151:00/U0155:00/U0182:00/U0214:00/U0235:00/U023A:00 [CONNECTIVITY MASTER UNIT] .)
U0235:00
U023A:00
U2300:54	(See DTC U2300:54 [CONNECTIVITY MASTER UNIT] .)
U2300:55	(See DTC U2300:55 [CONNECTIVITY MASTER UNIT] .)
U3000:42	(See DTC U3000:42 [CONNECTIVITY MASTER UNIT] .)
U3003:16	(See DTC U3003:16 [CONNECTIVITY MASTER UNIT] .)

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.