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 U0073, U2012 [MULTIPLEX COMMUNICATION SYSTEM]NOTES

2008 Mazda 3 s Touring, 4D Hatchback, 2.3 4, Standard

DTC U0073, U2012 [Multiplex Communication System]: Notes

2008 Mazda 3 s Touring, 4D Hatchback, 2.3 4, StandardSECTION Notes

DTC U0073, U2012 DETECTION CONDITION POSSIBLE CAUSE

DTC	U0073	PCM TCM EHPAS control module TPMS control module Instrument cluster	CAN system communication error
DTC	U2012	DSC HU/CM ABS HU/CM	CAN system communication error
DETECTION CONDITION		WARNING: Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only detection conditions may cause injury due to operating error, or damage the system. When performing an inspection, always follow the inspection procedure. CAN system related harness malfunction Related module communication error
POSSIBLE CAUSE		Open or short circuit in wiring harness Malfunction of connectors between PCM, TCM, EHPAS control module, DSC HU/CM, ABS HU/CM TPMS control module, and instrument cluster PCM malfunction TCM malfunction EHPAS control module malfunction TPMS control module malfunction DSC HU/CM malfunction ABS HU/CM malfunction Instrument cluster malfunction
Courtesy of MAZDA MOTORS CORP.

RENDER: 1.0x

NO RELATED

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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.