DTC U0001-88: U0100-00: U0101-00: U0121-00: U0121-87: U0131-00: U0140-00: U0146-00: U0151-00: U0155-00: Communication Error

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

System malfunction location	U0001:88 Module communication error (HS-CAN) U0100:00 Communication error with PCM U0101:00 Communication error with TCM U0121:00 Communication error with DSC HU/CM U0121:87 Communication error with DSC HU/CM U0131:00 Communication error with EPS control module U0140:00 Communication error with front body control module (FBCM) U0146:00 Communication error with instrument cluster U0151:00 SAS control module communication error U0155:00 Communication error with instrument cluster
Detection condition	U0001:88 The start stop unit detects CAN bus communication line (HS-CAN) malfunction 10 times continuously. U0100:00 The start stop unit could not receive CAN signal from the PCM for 1 s or more . U0101:00 The start stop unit could not receive CAN signal from the TCM for 1 s or more . U0121:00 The start stop unit could not receive CAN signal from the DSC HU/CM for 1 s or more . U0121:87 The start stop unit could not receive CAN signal from the DSC HU/CM for 10 s or more . U0131:00 The start stop unit could not receive CAN signal from the EPS control module for 1.2 s or more . U0140:00 The start stop unit could not receive CAN signal from the front body control module (FBCM) for 5 s or more . U0146:00 The start stop unit cannot receive gateway signals from the instrument cluster for 5 s or more with the ignition switched ON (engine off or on). U0151:00 The start stop unit could not receive CAN signal from the SAS control module for 1 s or more . U0155:00 The start stop unit could not receive CAN signal from the instrument cluster for 5 s or more .
Fail-safe	U0001:88 Sets to default signal. U0100:00 Sets to default signal. U0101:00 Sets to default signal. U0121:00 Sets to default signal. U0121:87 Sets to default signal. U0131:00 Sets to default signal. U0140:00 Sets to default signal. U0146:00 Sets to default signal. U0151:00 Sets to default signal. U0155:00 Sets to default signal.
Possible cause	Malfunction in CAN bus communication line Malfunction in CAN line between the PCM and start stop unit Malfunction in CAN line between the TCM and start stop unit Malfunction in CAN line between the DSC HU/CM and start stop unit Malfunction in CAN line between the EPS control module and start stop unit Malfunction in CAN line between the front body control module (FBCM) and start stop unit Malfunction in CAN line between the SAS control module and start stop unit Malfunction in CAN line between the instrument cluster and start stop unit
System wiring diagram	-

Diagnostic Procedure

Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See FOREWORD .)