2021 Mazda MX-5 Miata Club, Automatic TransFACTORY OEM SERVICE PROCEDURE

Retractable Fastback Control Module DTCS

RETRACTABLE FASTBACK CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC No. Refer to
B1D98:23 (See DTC B1D98:23 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D98:79 (See DTC B1D98:79 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D99:14 (See DTC B1D99:14 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D99:74 (See DTC B1D99:74 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D99:94 (See DTC B1D99:94 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9A:23 (See DTC B1D9A:23 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9A:79 (See DTC B1D9A:79 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9B:14 (See DTC B1D9B:14 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9B:74 (See DTC B1D9B:74 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9B:94 (See DTC B1D9B:94 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9C:23 (See DTC B1D9C:23 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9C:79 (See DTC B1D9C:79 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9D:14 (See DTC B1D9D:14 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9D:74 (See DTC B1D9D:74 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9D:94 (See DTC B1D9D:94 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9E:23 (See DTC B1D9E:23 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9E:79 (See DTC B1D9E:79 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9F:14 (See DTC B1D9F:14 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9F:74 (See DTC B1D9F:74 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1D9F:94 (See DTC B1D9F:94 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA0:23 (See DTC B1DA0:23 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA0:79 (See DTC B1DA0:79 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA1:14 (See DTC B1DA1:14 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA1:74 (See DTC B1DA1:74 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA1:94 (See DTC B1DA1:94 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA2:92 (See DTC B1DA2:92 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA3:92 (See DTC B1DA3:92 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA4:29 (See DTC B1DA4:29 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA5:29 (See DTC B1DA5:29 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA6:29 (See DTC B1DA6:29 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA7:29 (See DTC B1DA7:29 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA8:23 (See DTC B1DA8:23 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA8:24 (See DTC B1DA8:24 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA9:23 (See DTC B1DA9:23 [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA9:2A (See DTC B1DA9:2A [RETRACTABLE HARDTOP CONTROL MODULE] .)
B1DA9:2B (See DTC B1DA9:2B [RETRACTABLE HARDTOP CONTROL MODULE] .)
U0001:88 (See DTC U0001:88/U0100:00/U0101:00/U0155:00 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U0030:87 (See DTC U0030:87 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U0031:86 (See DTC U0031:86 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U0100:00 (See DTC U0001:88/U0100:00/U0101:00/U0155:00 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U0101:00
U0155:00
U0401:64 (See DTC U0401:64 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U0401:86 (See DTC U0401:86 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U0402:86 (See DTC U0402:86 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U200B:16 (See DTC U200B:16 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U2300:54 (See DTC U2300:54 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U2300:55 (See DTC U2300:55 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U2300:56 (See DTC U2300:56 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U2300:64 (See DTC U2300:64 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U3000:44 (See DTC U3000:44 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U3000:45 (See DTC U3000:45 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U3000:49 (See DTC U3000:49 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U3003:16 (See DTC U3003:16 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U3003:17 (See DTC U3003:17 [RETRACTABLE HARDTOP CONTROL MODULE] .)
U3003:1C (See DTC U3003:1C [RETRACTABLE HARDTOP CONTROL MODULE] .)
Factory Service Tools

Use the Manual With the Right Hardware

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

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

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.