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 MANUALSMAZDA20083 S TOURING, 4D HATCHBACK, 2.3 4, STANDARDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM)DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM]
2008 Mazda 3 s Touring, 4D Hatchback, 2.3 4, Standard
DTC Table [Multiplex Communication System]
2008 Mazda 3 s Touring, 4D Hatchback, 2.3 4, StandardSECTION DTC Table [Multiplex Communication System]
DTC REFERENCE CHART
| DTC | Malfunction location | DTC output module | Page |
|---|---|---|---|
| U0073 | CAN system communication error |
|
(See DTC U0073, U2012 [MULTIPLEX COMMUNICATION SYSTEM] ). |
| SAS control module | (See DTC U0073, U0516, U1900, U2516 [MULTIPLEX COMMUNICATION SYSTEM] ). | ||
| U0100 | Communication error to PCM |
|
(See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [MULTIPLEX COMMUNICATION SYSTEM] ). |
| U0101 | Communication error to TCM |
|
|
| U0121 | Communication error to DSC HU/CM or ABS HU/CM |
|
|
| U0127 | Communication error to instrument cluster | TPMS control module | |
| U0131 | Communication error to EHPAS control module | Instrument cluster | |
| U0140 | Communication error to PJB |
|
|
| U0151 | Communication error to SAS control module | Instrument cluster | |
| U0155 | Communication error to instrument cluster |
|
|
| U0164 | Communication error to climate control unit | Information display | |
| U0181 | Communication error to instrument cluster | Information display | |
| U0184 | Communication error to audio unit (base module) |
|
|
| U0516 | CAN system communication error | Climate control unit | (See DTC U0073, U0516, U1900, U2516 [MULTIPLEX COMMUNICATION SYSTEM] ). |
| U1900 | Communication error to PCM |
|
(See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [MULTIPLEX COMMUNICATION SYSTEM] ). |
| Communication error to instrument cluster | SAS control module | ||
| CAN system communication error Abnormal message from other modules | PJB | (See
PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [MULTIPLEX COMMUNICATION SYSTEM] ). (See DTC U0073, U0516, U1900, U2516 [MULTIPLEX COMMUNICATION SYSTEM] ). |
|
| U2012 | CAN system communication error |
|
(See DTC U0073, U2012 [MULTIPLEX COMMUNICATION SYSTEM] ). |
| U2023 | Abnormal message from PCM | EH PAS control module | (See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [MULTIPLEX COMMUNICATION SYSTEM] ). |
| Abnormal message from other modules | Instrument cluster | ||
| U2202 | Communication error to PCM | DSC HU/CM | |
| U2516 | CAN system communication error |
|
(See DTC U0073, U0516, U1900, U2516 [MULTIPLEX COMMUNICATION SYSTEM] ). |
| U2523 | Communication error to PCM |
|
(See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [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.