DTC U0001 88, U0100 00, U0101 00, U0121 00, U0131 00, U0140 00, U0151 00, U0155 00, U0214 00, U0235 68, U023A 00: Module Communication Error: Notes

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0001:88, U0100:00, U0101:00, U0121:00, U0131:00 (VEHICLE CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

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 U0131:00: Communication error with EPS control module U0140:00: Communication error with front body control module (FBCM) U0151:00: Communication error with SAS control module U0155:00: Communication error with Instrument cluster U0214:00: Communication error with start stop unit U0235:68: Communication error with laser sensor U023A:00: Communication error with forward sensing camera (FSC)
Detection condition	U0001:88: Vehicle control module (V/C-module) detects a CAN bus communication line (HS-CAN) malfunction. U0100:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the PCM. U0101:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the TCM. U0121:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the DSC HU/CM. U0131:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the EPS control module. U0140:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the front body control module (FBCM). U0151:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the SAS control module. U0155:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the Instrument cluster. U0214:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the start stop unit. U0235:68: Vehicle control module (V/C-module) cannot receive the CAN signal from the laser sensor. U023A:00: Vehicle control module (V/C-module) cannot receive the CAN signal from the forward sensing camera (FSC).
Fail-safe	U0001:88 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0100:00 Inhibits the Mazda radar cruise control (MRCC) system control U0101:00 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0121:00 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0131:00 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0140:00 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0151:00 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0155:00 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0214:00 Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control U0235:68 Not applicable U023A:00 Not applicable
Possible cause	Malfunction in CAN bus communication line Malfunction in CAN line between PCM and vehicle control module (V/C-module) Malfunction in CAN line between TCM and vehicle control module (V/C-module) Malfunction in CAN line between DSC HU/CM and vehicle control module (V/C-module) Malfunction in CAN line between EPS control module and vehicle control module (V/C-module) Malfunction in CAN line between front body control module (FBCM) and vehicle control module (V/C-module) Malfunction in CAN line between SAS control module and vehicle control module (V/C-module) Malfunction in CAN line between instrument cluster and vehicle control module (V/C-module) Malfunction in CAN line between start stop unit and vehicle control module (V/C-module) Malfunction in CAN line between laser sensor and vehicle control module (V/C-module) Malfunction in CAN line between forward sensing camera (FSC) and vehicle control module (V/C-module)
System wiring diagram	Not applicable