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.
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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONDTC INDEXMULTIPLEX COMMUNICATION SYSTEM DTCSHS-CAN
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans
Multiplex Communication System DTCS: HS-Can
2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION HS-Can
HS-CAN DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC output nodule (M-MDS display) | DTC | Malfunction location | Reference |
|---|---|---|---|
| PCM (PCM) | U0073 | CAN system communication error | (See DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) |
| U0101 | Communication error to TCM | (See DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] ) | |
| U0121 | Communication error to ABS HU/CM (With ABS) Communication error to DSC HU/CM (With DSC) |
||
| U0155 | Communication error to instrument cluster | ||
| TCM (TCM) | U0073 | CAN system communication error | (. DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) |
| U0100 | Communication error to PCM | (See DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] ) | |
| U0121 | Communication error to ABS HU/CM (With ABS) Communication error to DSC HU/CM (With DSC) |
||
| ABS HU/CM (ABS) | U0073 | CAN system communication error | (See DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) |
| U1900 | Communication error to other module | ||
| U2023 | Abnormal message from PCM | (See DTC U2023 [ABS] ) | |
| DSC HU/CM (ABS) | U0073 | CAN system communication error | (See DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) |
| U0100 | Communication error to PCM | (See DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] ) | |
| U0101 | Communication error to TCM | ||
| U0155 | Communication error to instrument cluster | ||
| U1900 | Communication error to other module | (See DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) | |
| U2023 | Abnormal message from PCM | (See DTC U2023 [DYNAMIC STABILITY CONTROL (DSC)] ) | |
| Power retractable hardtop control module (RHT) | U0073 | CAN system communication error | (See DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) |
| U0100 | Communication error to PCM | (See DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] ) | |
| U0101 | Communication error to TCM | ||
| U2197 | Signal error from PCM | ||
| Keyless control module (RKE) | U0073 | CAN system communication error | (See DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) |
| U0100 | Communication error to PCM | (See DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] ) | |
| U0207 | Communication error to power retractable hardtop control module | ||
| U0323 | Communication error to instrument cluster | ||
| U2023 | Abnormal message from PCM | (See DTC U2023 [ADVANCED KEYLESS AND START SYSTEM] ) | |
| Instrument cluster (IC) | U0073 | CAN system communication error | (See DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM] ) |
| U0100 | Communication error to PCM | (See DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] ) | |
| U0101 | Communication error to TCM | ||
| U0121 | Communication error to ABS HU/CM (With ABS) Communication error to DSC HU/CM (With DSC) |
||
| U0207 | Communication error to power retractable hardtop control module | ||
| U0214 | Communication error to keyless control module | ||
| U2023 | Abnormal message from other module | (See DTC U2023 [INSTRUMENT CLUSTER] ) | |
| U2197 | Signal error from PCM | (See DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] ) |
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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.