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.
2020 Mazda CX-30 Base, AWDFACTORY OEM SERVICE PROCEDURE
HS/Ms Can System DTCS
HS/MS CAN SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | System malfunction location | Reference for initial letter of DTC |
|---|---|---|
| U0073:00 | Unit communication error | (See DTC TABLE [PCM (SKYACTIV-G (US))] .) |
| U0075:00 | Unit communication error | |
| U0101:00 | Communication error with TCM | |
| U0121:00 | Communication error with DSC HU/CM | |
| U0131:00 | Communication error with EPS control module | |
| U0140:00 | Communication error with body control module (BCM) | |
| U0151:00 | Communication error with SAS control module | |
| U0155:00 | Communication error with instrument cluster | |
| U0164:00 | Communication error with dash-electrical supply unit | |
| U2121:00 | Communication error with vehicle control module (VCM) | |
| U212E:00 | Communication error with door-electrical supply unit (driver's side) | |
| U2131:00 | Communication error with electrical supply unit (ESU) | |
| U2133:00 | Communication error with climate control unit | |
| U0073:00 | Unit communication error | (See DTC TABLE [DSC HU/CM (US)] .) |
| U0075:00 | Unit communication error | |
| U0100:00 | Communication error with PCM | |
| U0101:00 | Communication error with TCM | |
| U0131:00 | Communication error with EPS control module | |
| U0140:00 | Communication error with body control module (BCM) | |
| U0151:00 | Communication error with SAS control module | |
| U0155:00 | Communication error with instrument cluster | |
| U0164:00 | Communication error with dash-electrical supply unit | |
| U2121:00 | Communication error with vehicle control module (VCM) | |
| U212E:00 | Communication error with door-electrical supply unit (driver's side) | |
| U2131:00 | Communication error with electrical supply unit (ESU) | |
| U0001:88 | Unit communication error | (See DTC TABLE [ELECTRIC POWER STEERING (EPS) (US)] .) |
| U0100:00 | Communication error with PCM | |
| U0121:00 | Communication error with DSC HU/CM | |
| U0140:00 | Communication error with body control module (BCM) | |
| U2121:00 | Communication error with vehicle control module (VCM) | |
| B14F0:88 | Unit communication error | (See DTC TABLE [VEHICLE CONTROL MODULE (US)] .) |
| B14F1:88 | Unit communication error | |
| B14F2:88 | Unit communication error | |
| B14F3:88 | Unit communication error | |
| B14F4:88 | Unit communication error | |
| B14F7:88 | Unit communication error | |
| C1A67:88 | Unit communication error | |
| U0075:88 | Unit communication error | |
| U0077:88 | Unit communication error | |
| U0078:88 | Unit communication error | |
| U007B:88 | Unit communication error | |
| U0100:00 | Communication error with PCM | |
| U0101:00 | Communication error with TCM | |
| U0121:00 | Communication error with DSC HU/CM | |
| U0126:00 | Communication error with steering angle sensor | |
| U0131:00 | Communication error with EPS control module | |
| U0140:00 | Communication error with body control module (BCM) | |
| U0151:00 | Communication error with SAS control module | |
| U0155:00 | Communication error with instrument cluster | |
| U0156:00 | Communication error with connectivity master unit (CMU) | |
| U0164:00 | Communication error with dash-electrical supply unit | |
| U2120:00 | Communication error with forward sensing camera (FSC) | |
| U2122:00 | Communication error with front radar sensor | |
| U2123:00 | Communication error with front side radar sensor (LH) | |
| U2125:00 | Communication error with driver monitor control module | |
| U2126:00 | Communication error with parking assist unit | |
| U212E:00 | Communication error with door-electrical supply unit (driver's side) | |
| U2131:00 | Communication error with electrical supply unit (ESU) | |
| U2132:00 | Communication error with 360° view monitor control module | |
| U2133:00 | Communication error with climate control unit | |
| U2139:00 | Communication error with rear side radar sensor (RH) | |
| U213A:00 | Communication error with door-electrical supply unit (passenger's side) | |
| U0073:88 | Unit communication error | (See DTC TABLE [BODY CONTROL MODULE (BCM) (US)] .) |
| U0075:88 | Unit communication error | |
| U0076:88 | Unit communication error | |
| U0079:88 | Unit communication error | |
| U007A:88 | Unit communication error | |
| U007D:88 | Unit communication error | |
| U0100:00 | Communication error with PCM | |
| U0101:00 | Communication error with TCM | |
| U0115:00 | Communication error with PCM | |
| U0121:00 | Communication error with DSC HU/CM | |
| U0121:87 | Communication error with DSC HU/CM | |
| U0126:00 | Communication error with steering angle sensor | |
| U0131:00 | Communication error with EPS control module | |
| U0151:00 | Communication error with SAS control module | |
| U0155:00 | Communication error with instrument cluster | |
| U0156:00 | Communication error with connectivity master unit (CMU) | |
| U0158:00 | Communication error with active driving display | |
| U0164:00 | Communication error with dash-electrical supply unit | |
| U0182:00 | Communication error with adaptive front lighting system (AFS) control module | |
| U0198:00 | Communication error with telematics communication unit | |
| U0230:00 | Communication error with power liftgate (PLG) control module | |
| U0301:82 | Error signal received from PCM | |
| U0316:82 | Error signal received from DSC HU/CM | |
| U0320:82 | Error signal received from EPS control module | |
| U0323:82 | Error signal received from instrument cluster | |
| U0328:82 | Error signal received from steering angle sensor | |
| U0336:82 | Error signal received from SAS control module | |
| U0339:82 | Error signal received from door-electrical supply unit (driver's side) | |
| U2121:49 | Communication error with vehicle control module (VCM) | |
| U212A:00 | Communication error with front combination light (LH) | |
| U212C:00 | Communication error with shift panel (indicator) | |
| U212D:00 | Communication error with front combination light (RH) | |
| U212E:00 | Communication error with door-electrical supply unit (driver's side) | |
| U2131:00 | Communication error with electrical supply unit (ESU) | |
| U2133:00 | Communication error with climate control unit | |
| U213A:00 | Communication error with door-electrical supply unit (passenger's side) | |
| U213B:00 | Communication error with LF control unit | |
| U3000:88 | Module communication error | |
| U0079:00 | Unit communication error | (Refer to the [DTC TABLE [CONNECTIVITY MASTER UNIT]] in the appropriate service information) |
| U0140:00 | Communication error with body control module (BCM) | |
| B10A2:87 | SAS control module collision judgement system malfunction | (See DTC TABLE [TELEMATICS COMMUNICATION UNIT] .) |
| U007A:00 | Unit communication error | |
| U0140:00 | Communication error with body control module (BCM) | |
| U0151:00 | Communication error with SAS control module | |
| U0164:00 | Communication error with dash-electrical supply unit | |
| U0415:86 | Error signal received from DSC HU/CM | |
| U213C:00 | Communication error with DSC HU/CM | |
| U0001:88 | Unit communication error | (See DTC TABLE [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE (US)] .) |
| U0122:87 | Communication error with DSC HU/CM | |
| U0126:87 | Communication error with steering angle sensor | |
| U212A:87 | Communication error with front combination light (LH) | |
| U212B:87 | Communication error with body control module (BCM) | |
| U212D:87 | Communication error with front combination light (RH) | |
| B2009:92 | Unit communication error | (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (US)] .) |
| U0076:00 | Unit communication error | |
| U0100:00 | Communication error with PCM | |
| U0121:00 | Communication error with DSC HU/CM | |
| U0151:00 | Communication error with SAS control module | |
| U212B:00 | Communication error with body control module (BCM) | |
| U212E:00 | Communication error with door-electrical supply unit (driver's side) | |
| U2131:00 | Communication error with electrical supply unit (ESU) | |
| U2133:00 | Communication error with climate control unit | |
| U213A:00 | Communication error with door-electrical supply unit (passenger's side) | |
| U0001:88 | Unit communication error | (See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.)] .) |
| U0140:00 | Communication error with body control module (BCM) | |
| U0155:00 | Communication error with instrument cluster | |
| U0156:00 | Communication error with instrument cluster | |
| U0075:00 | Unit communication error | (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL) (US)]
.) (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EV6A-EL, EV6AX-EL) (US)] .) |
| U0100:00 | Communication error with PCM | |
| U0121:00 | Communication error with DSC HU/CM | |
| U0131:00 | Communication error with EPS control module | |
| U0140:00 | Communication error with body control module (BCM) | |
| U0155:00 | Communication error with instrument cluster | |
| U212C:00 | Communication error with shift panel (indicator) | |
| U0073:00 | Unit communication error | |
| U0100:00 | Communication error with PCM | |
| U0121:00 | Communication error with DSC HU/CM | |
| U0131:00 | Communication error with EPS control module | |
| U0155:00 | Communication error with instrument cluster | |
| U0214:00 | Communication error with start stop 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.