Home/Mazda/6/Mazda 6 GG (2002-2005)/Repair manual/Testing & Diagnostics/DTC U0100, DTC U0121 OR DTC U0155

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Wiring diagrams Section: Testing & Diagnostics

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DTC U0100, DTC U0121 OR DTC U0155 Mazda 6 GG

Testing & Diagnostics

Code Definition

DTC U0100: Communication Error To Power Control Module (PCM)
DTC U0121: Communication Error To Anti-Lock Brake System/Traction Control System Hydraulic Unit/Control Module (ABS/TCS HU/CM)
DTC U0155: Communication Error To Instrument Cluster

Refer to PROCEDURES FOR DETERMINING LOCATION OF A MALFUNCTION under SYSTEM TESTS.