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.
2005 Mazda 3 i, StandardFACTORY OEM SERVICE PROCEDURE
Multiplex Communication DTCS
MULTIPLEX COMMUNICATION DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Malfunction location | DTC output module | Action |
|---|---|---|---|
| U0073 | CAN system communication error |
|
(See DTC U0073, U0516, U2012 ) |
| SAS control module | (See DTC U0073, U1900, U2516 ) | ||
| U0100 | Communication error to PCM |
|
(See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION ) |
| U0121 | Communication error to ABS HU/CM |
|
|
| U0127 | Communication error to TPMS control module | Instrument cluster | |
| U0131 | Communication error to EHPAS control module | Instrument cluster | |
| U0140 | Communication error to PJB | Instrument cluster | |
| U0151 | Communication error to SAS control module | Instrument cluster | |
| U0155 | Communication error to instrument cluster | PCM | |
| U0184 | Communication error to audio unit (base module) | Instrument cluster | |
| U0516 | CAN system communication error | TPMS control module | (See DTC U0073, U0516, U2012 ) |
| U1900 | Communication error to PCM |
|
(See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION ) |
| 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 ) (See DTC U0073, U1900, U2516 ) | |
| U2012 | CAN system communication error | ABS HU/CM | (See DTC U0073, U0516, U2012 ) |
| U2023 | Abnormal message from PCM | EHPAS control module | (See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION ) |
| U2202 | Communication error to PCM | ABS HU/CM | (See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION ) |
| U2516 | CAN system communication error | Instrument cluster | (See DTC U0073, U1900, U2516 ) |
| U2523 | Communication error to PCM | ABS HU/CM | (See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION ) |
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.