Operation CHARM
: Car repair manuals for everyone.
Home
>>
Mazda
>>
2009
>>
6 V6-3.7L
>>
Repair and Diagnosis
>>
A L L Diagnostic Trouble Codes ( DTC )
>>
Testing and Inspection
>>
U Code Charts
>>
U0121
U0121
U0121 - Communication error to ABS/TCS HUCM or DSC HUCM
Determining Malfunctioning Part (HS-CAN) [Multiplex Communication System]