2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

MAZDA Connect DTCS

MAZDA CONNECT DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC refer to
B108E:49 (See DTC B108E:49 [CONNECTIVITY MASTER UNIT] .)
B119F:13 (See DTC B119F:13 [CONNECTIVITY MASTER UNIT (US)] .)
B119F:2B (See DTC B119F:2B [CONNECTIVITY MASTER UNIT (US)] .)
B119F:49 (See DTC B119F:49 [CONNECTIVITY MASTER UNIT] .)
B11BA:13 (See DTC B11BA:13 [CONNECTIVITY MASTER UNIT] .)
B11BA:2B (See DTC B11BA-2B: STEERING SWITCH IS STUCK ON [CONNECTIVITY MASTER UNIT]
B1238:49 (See DTC B1238:49 [CONNECTIVITY MASTER UNIT] .)
B1A01:11 (See DTC B1A01:11 [CONNECTIVITY MASTER UNIT] .)
B1A01:12 (See DTC B1A01:12 [CONNECTIVITY MASTER UNIT] .)
B1A01:13 (See DTC B1A01:13 [CONNECTIVITY MASTER UNIT] .)
B1A01:2B (See DTC B1A01:2B [CONNECTIVITY MASTER UNIT] .)
B1A02:11 (See DTC B1A02:11 [CONNECTIVITY MASTER UNIT] .)
B1A02:12 (See DTC B1A02:12 [CONNECTIVITY MASTER UNIT] .)
B1A02:13 (See DTC B1A02:13 [CONNECTIVITY MASTER UNIT] .)
B1A02:2B (See DTC B1A02:2B [CONNECTIVITY MASTER UNIT] .)
B1A03:11 (See DTC B1A03:11 [CONNECTIVITY MASTER UNIT] .)
B1A03:12 (See DTC B1A03:12 [CONNECTIVITY MASTER UNIT] .)
B1A03:13 (See DTC B1A03:13 [CONNECTIVITY MASTER UNIT] .)
B1A03:2B (See DTC B1A03:2B [CONNECTIVITY MASTER UNIT] .)
B1A04:11 (See DTC B1A04:11 [CONNECTIVITY MASTER UNIT] .)
B1A04:12 (See DTC B1A04:12 [CONNECTIVITY MASTER UNIT] .)
B1A04:13 (See DTC B1A04:13 [CONNECTIVITY MASTER UNIT] .)
B1A04:2B (See DTC B1A04:2B [CONNECTIVITY MASTER UNIT] .)
B1A05:11 (See DTC B1A05:11 [CONNECTIVITY MASTER UNIT] .)
B1A05:12 (See DTC B1A05:12 [CONNECTIVITY MASTER UNIT] .)
B1A05:13 (See DTC B1A05:13 [CONNECTIVITY MASTER UNIT] .)
B1A05:2B (See DTC B1A05:2B [CONNECTIVITY MASTER UNIT] .)
B1A06:11 (See DTC B1A06:11 [CONNECTIVITY MASTER UNIT] .)
B1A06:12 (See DTC B1A06:12 [CONNECTIVITY MASTER UNIT] .)
B1A06:13 (See DTC B1A06:13 [CONNECTIVITY MASTER UNIT] .)
B1A06:2B (See DTC B1A06:2B [CONNECTIVITY MASTER UNIT] .)
B1A07:11 (See DTC B1A07:11 [CONNECTIVITY MASTER UNIT] .)
B1A07:12 (See DTC B1A07:12 [CONNECTIVITY MASTER UNIT] .)
B1A07:13 (See DTC B1A07:13 [CONNECTIVITY MASTER UNIT] .)
B1A07:2B (See DTC B1A07:2B [CONNECTIVITY MASTER UNIT] .)
B1A08:11 (See DTC B1A08:11 [CONNECTIVITY MASTER UNIT] .)
B1A08:12 (See DTC B1A08:12 [CONNECTIVITY MASTER UNIT] .)
B1A08:13 (See DTC B1A08:13 [CONNECTIVITY MASTER UNIT] .)
B1A08:2B (See DTC B1A08:2B [CONNECTIVITY MASTER UNIT] .)
B1A09:11 (See DTC B1A09:11 [CONNECTIVITY MASTER UNIT] .)
B1A09:12 (See DTC B1A09:12 [CONNECTIVITY MASTER UNIT] .)
B1A09:13 (See DTC B1A09:13 [CONNECTIVITY MASTER UNIT] .)
B1A09:2B (See DTC B1A09:2B [CONNECTIVITY MASTER UNIT] .)
B1A10:11 (See DTC B1A10:11 [CONNECTIVITY MASTER UNIT] .)
B1A10:12 (See DTC B1A10:12 [CONNECTIVITY MASTER UNIT] .)
B1A10:13 (See DTC B1A10:13 [CONNECTIVITY MASTER UNIT] .)
B1A10:2B (See DTC B1A10:2B [CONNECTIVITY MASTER UNIT] .)
B1A11:11 (See DTC B1A11:11 [CONNECTIVITY MASTER UNIT] .)
B1A11:12 (See DTC B1A11:12 [CONNECTIVITY MASTER UNIT] .)
B1A11:13 (See DTC B1A11:13 [CONNECTIVITY MASTER UNIT] .)
B1A11:2B (See DTC B1A11:2B [CONNECTIVITY MASTER UNIT] .)
B1A12:11 (See DTC B1A12:11 [CONNECTIVITY MASTER UNIT] .)
B1A12:12 (See DTC B1A12:12 [CONNECTIVITY MASTER UNIT] .)
B1A12:13 (See DTC B1A12:13 [CONNECTIVITY MASTER UNIT] .)
B1A12:2B (See DTC B1A12:2B [CONNECTIVITY MASTER UNIT] .)
B1A20:13 (See DTC B1A20:13 [CONNECTIVITY MASTER UNIT (US)] .)
B1A20:2B (See DTC B1A20:2B [CONNECTIVITY MASTER UNIT (US)] .)
B1A21:13 (See DTC B1A21:13 [CONNECTIVITY MASTER UNIT] .)
B1A21:2B (See DTC B1A21:2B [CONNECTIVITY MASTER UNIT] .)
B1A30:2B (See DTC B1A30:2B [CONNECTIVITY MASTER UNIT] .)
B1A30:49 (See DTC B1A30:49 [CONNECTIVITY MASTER UNIT] .)
B1A32:11 (See DTC B1A32:11 [CONNECTIVITY MASTER UNIT] .)
B1A32:12 (See DTC B1A32:12 [CONNECTIVITY MASTER UNIT] .)
B1A32:13 (See DTC B1A32:13 [CONNECTIVITY MASTER UNIT] .)
B1A32:2B (See DTC B1A32:2B [CONNECTIVITY MASTER UNIT] .)
B1A32:49 (See DTC B1A32:49 [CONNECTIVITY MASTER UNIT] .)
B1A33:49 (See DTC B1A33:49 [CONNECTIVITY MASTER UNIT] .)
B1A89:13 (See DTC B1A89:13 [CONNECTIVITY MASTER UNIT] .)
B1A89:2B (See DTC B1A89:2B [CONNECTIVITY MASTER UNIT] .)
B1A89:49 (See DTC B1A89:49 [CONNECTIVITY MASTER UNIT] .)
U0079:00 (See DTC U0079:00 [CONNECTIVITY MASTER UNIT] .)
U0140:00 (See DTC U0140:00 [CONNECTIVITY MASTER UNIT] .)
U0162:00 (See DTC U0162:00 [CONNECTIVITY MASTER UNIT] .)
U0186:00 (See DTC U0186:00 [CONNECTIVITY MASTER UNIT] .)
U0186:02 (See DTC U0186:02 [CONNECTIVITY MASTER UNIT (US)] .)
U0186:08 (See DTC U0186:08 [CONNECTIVITY MASTER UNIT (US)] .)
U0198:00 (See DTC U0198:00 [CONNECTIVITY MASTER UNIT] .)
U0264:00 (See DTC U0264:00 [CONNECTIVITY MASTER UNIT] .)
U2141:00 (See DTC U2141:00 [CONNECTIVITY MASTER UNIT] .)
U2142:00 (See DTC U2142:00 [CONNECTIVITY MASTER UNIT (US)] .)
U2145:02 (See DTC U2145:02 [CONNECTIVITY MASTER UNIT] .)
U2145:08 (See DTC U2145:08 [CONNECTIVITY MASTER UNIT] .)
U2300:54 (See DTC U2300:54 [CONNECTIVITY MASTER UNIT] .)
U2300:55 (See DTC U2300:55 [CONNECTIVITY MASTER UNIT] .)
U2300:56 (See DTC U2300:56 [CONNECTIVITY MASTER UNIT] .)
U2300:64 (See DTC U2300:64 [CONNECTIVITY MASTER UNIT] .)
U3000:42 (See DTC U3000:42 [CONNECTIVITY MASTER UNIT] .)
U3000:47 (See DTC U3000:47 [CONNECTIVITY MASTER UNIT] .)
U3000:49 (See DTC U3000:49 [CONNECTIVITY MASTER UNIT] .)
U3003:16 (See DTC U3003:16 [CONNECTIVITY MASTER UNIT (US)] .)
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

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

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

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