DTC: U0100-00, U0101-00, U0101-00, U0104-00, U0126-00, U0155-00 (2016 2017 2018)

DTC U0100-00  : CAN Communication Failure with ECM/ISU (9-Speed A/T)

DTC U0101-00  : CAN Communication Failure with TCM (9-Speed A/T)

DTC U0101-00  : CAN Communication Failure with TCM (i-VTM Control Unit / 9-Speed A/T)

DTC U0104-00  : CAN Communication Failure with ACC (9-Speed A/T)

DTC U0126-00  : CAN Communication Failure with Absolute Steering Wheel Angle Sensor (9-Speed A/T)

DTC U0155-00  : CAN Communication Failure with METER (9-Speed A/T)

NOTE: 

• Before You Troubleshoot, Review The General Troubleshooting Information .
• If more than one DTC codes are listed in Troubleshooting, refer to relevant information only.
• The DTC may be stored due to loss of voltage supply or ground at the transmitting control unit. Verify voltage supply and ground are OK on the control unit related to the specific code before following this troubleshooting.
• If the DTC U0101-00 is displayed, check the U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit), too. (Only the AWD)

DTCs (VSA)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode, then start the engine.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   U0100-00 CAN Communication Failure with ECM/ISU
   U0101-00 CAN Communication Failure with TCM
   U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit)
   U0104-00 CAN Communication Failure with ACC
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor
   U0155-00 CAN Communication Failure with METER

   Is any of DTC indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control units and VSA Modulator-Control Unit. Refer to: Intermittent Failures Troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. Open wire check (F-CAN A_L, F-CAN A_H lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   VSA modulator-control unit 38P connector

   - 3. Disconnect the transmitting control unit connectors. (Refer to the DTC code shown on the display, and then disconnect the connector(s) based on the instructions in the table below.)

   NOTE: 

   • Always short the SCS line with the HDS before removing PCM connector(s).
   • Jump the SCS line with the HDS, and wait more than 1 minute.

   PCM connector A (51P)

   TCM 58P connector

   i-VTM control unit 24P Connector

   Multipurpose camera unit 20P connector

   Steering angle sensor 4P connector

   Gauge control module 32P connector

   - 4. Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN A_H circuit and the F-CAN A_L circuit as specified in the table while in the vehicle OFF mode.

   Test condition

   Vehicle OFF (LOCK) mode

   DTC	CIRCUIT NAME	RECEIVING CONTROL UNIT	TRANSMITTING CONTROL UNIT
   U0100-00 CAN Communication Failure with ECM/ISU	F-CAN A_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) .	PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) or PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020 201)
   	F-CAN A_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)	PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) or PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020 2021)

   U0101-00 CAN Communication Failure with TCM	F-CAN A_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) .	TCM 58P connector No. 34 - Refer to: A/T Control System Connector for Inputs and Outputs (2020 2021) or A/T Control System Connector for Inputs and Outputs (9-Speed A/T) (2019) or A/T Control System Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) .
   	F-CAN A_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) .	TCM 58P connector No. 47 - Refer to: A/T Control System Connector for Inputs and Outputs (2020 2021) or A/T Control System Connector for Inputs and Outputs (9-Speed A/T) (2019) or A/T Control System Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) .
   U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit)	F-CAN A_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) .	i-VTM control unit 24P connector No. 14 - Refer to: i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2016 2017 2018) or i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2019 2020 2021) .
   	F-CAN A_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) .	i-VTM control unit 24P connector No. 24 - Refer to: i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2016 2017 2018) or i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2019 2020 2021) .
   U0104-00 CAN Communication Failure with ACC	F-CAN A_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) .	Multipurpose camera unit 20P connector No. 2 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2019 2020 2021) or Multipurpose Camera Unit Connector for Inputs and Outputs (2016 2017 2018) .
   	F-CAN A_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	Multipurpose camera unit 20P connector No. 13 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs, or Multipurpose Camera Unit Connector for Inputs and Outputs (2019 2020 2021)
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor	F-CAN A_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)	Steering angle sensor 4P connector No. 2
   	F-CAN A_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)	Steering angle sensor 4P connector No. 3
   U0155-00 CAN Communication Failure with METER	F-CAN A_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	Gauge control module 32P connector No. 24 - Refer to: Gauge Control Module Connector for Inputs and Outputs (2020 2021) or Gauge Control Module Connector for Inputs and Outputs (2019) or Gauge Control Module Connector for Inputs and Outputs (2016 2017 2018)
   	F-CAN A_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)	Gauge control module 32P connector No. 25 - Refer to: Gauge Control Module Connector for Inputs and Outputs (2020 2021) or Gauge Control Module Connector for Inputs and Outputs (2019) or Gauge Control Module Connector for Inputs and Outputs (2016 2017 2018)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN A_L and F-CAN A_H wires are OK at this time, replace the transmitting control unit. (Refer to the DTC code shown on the display, and then replace the control unit based on the instructions in the table below.)

   DTC	TRANSMITTING CONTROL UNIT
   U0100-00 CAN Communication Failure with ECM/ISU	PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) or PCM Removal and Installation
   U0101-00 CAN Communication Failure with TCM	TCM
   U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit)	i-VTM control unit
   U0104-00 CAN Communication Failure with ACC	Multipurpose camera unit
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor	Steering angle sensor
   U0155-00 CAN Communication Failure with METER	Gauge control module

   NO 

   Repair an open in the F-CAN A_H and/or F-CAN A_L wires between the receiving control unit and the transmitting control unit.

DTC U0100-00  : CAN Communication Failure with ECM/ISU (6-Speed A/T)

DTC U0101-00  : CAN Communication Failure with TCM (6-Speed A/T)

DTC U0101-00  : CAN Communication Failure with TCM (i-VTM Control Unit / 6-Speed A/T)

DTC U0104-00  : CAN Communication Failure with ACC (6-Speed A/T)

DTC U0126-00  : CAN Communication Failure with Absolute Steering Wheel Angle Sensor (6-Speed A/T)

DTC U0155-00  : CAN Communication Failure with METER (6-Speed A/T)

NOTE: 

• Before You Troubleshoot, Review The General Troubleshooting Information .
• If more than one DTC codes are listed in Troubleshooting, refer to relevant information only.
• The DTC may be stored due to loss of voltage supply or ground at the transmitting control unit. Verify voltage supply and ground are OK on the control unit related to the specific code before following this troubleshooting.
• If the DTC U0101-00 is displayed, check the U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit), too. (Only the AWD)

DTCs (VSA)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode, then start the engine.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   U0100-00 CAN Communication Failure with ECM/ISU
   U0101-00 CAN Communication Failure with TCM
   U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit)
   U0104-00 CAN Communication Failure with ACC
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor
   U0155-00 CAN Communication Failure with METER

   Is any of DTC indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control units, and VSA modulator-control unit. Refer to: Intermittent Failures Troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. Open wire check (F-CAN_H, F-CAN_L lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   VSA modulator-control unit 38P connector

   - 3. Disconnect the transmitting control unit connectors. (Refer to the DTC code shown on the display, and then disconnect the connector(s) based on the instructions in the table below.)

   NOTE: 

   • Always short the SCS line with the HDS before removing PCM connector(s).
   • Jump the SCS line with the HDS, and wait more than 1 minute.

   PCM connector A (51P)

   i-VTM control unit 24P Connector

   Multipurpose camera unit 20P connector

   Steering angle sensor 4P connector

   Gauge control module 32P connector

   - 4. Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN_H circuit and the F-CAN_L circuit as specified in the table while in the vehicle OFF mode.

   Test condition

   Vehicle OFF (LOCK) mode

   DTC	CIRCUIT NAME	RECEIVING CONTROL UNIT	TRANSMITTING CONTROL UNIT
   U0100-00 CAN Communication Failure with ECM/ISU	F-CAN_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) or PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020)
   	F-CAN_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)	PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) or PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
   U0101-00 CAN Communication Failure with TCM	F-CAN_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) or PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020)
   	F-CAN_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)	PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) or PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020)

   U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit)	F-CAN_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	i-VTM control unit 24P connector No. 14 - Refer to: i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2019 2020 2021) or i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2016 2017 2018) .
   	F-CAN_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) .	i-VTM control unit 24P connector No. 24 - Refer to: i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2016 2017 2018) or i-VTM Control Unit Connector for Inputs and Outputs (AWD) (2019 2020 2021) .
   U0104-00 CAN Communication Failure with ACC	F-CAN_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	Multipurpose camera unit 20P connector No. 2 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2016 2017 2018) or Multipurpose Camera Unit Connector for Inputs and Outputs (2019 2020 2021)
   	F-CAN_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs ((2019 2020 2021) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018)	Multipurpose camera unit 20P connector No. 13 - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2016 2017 2018) or Multipurpose Camera Unit Connector for Inputs and Outputs (2019 2020 2021)
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor	F-CAN_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	Steering angle sensor 4P connector No. 2
   	F-CAN_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	Steering angle sensor 4P connector No. 3
   U0155-00 CAN Communication Failure with METER	F-CAN_H	VSA modulator-control unit 38P connector No. 6 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	Gauge control module 32P connector No. 24 - Refer to: Gauge Control Module Connector for Inputs and Outputs (2016 2017 2018) or Gauge Control Module Connector for Inputs and Outputs (2019) or Gauge Control Module Connector for Inputs and Outputs (2020 2021)
   	F-CAN_L	VSA modulator-control unit 38P connector No. 7 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2016 2017 2018) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021)	Gauge control module 32P connector No. 25 - Refer to: Gauge Control Module Connector for Inputs and Outputs (2016 2017 2018) or Gauge Control Module Connector for Inputs and Outputs (2019) or Gauge Control Module Connector for Inputs and Outputs (2020 2021)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN_L and F-CAN_H wires are OK at this time, replace the transmitting control unit. (Refer to the DTC code shown on the display, and then replace the control unit based on the instructions in the table below.)

   DTC	TRANSMITTING CONTROL UNIT
   U0100-00 CAN Communication Failure with ECM/ISU	PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 22020 2021) or PCM Removal and Installation
   U0101-00 CAN Communication Failure with TCM	PCM - Refer to: PCM Removal and Installation, or PCM Removal and Installation (9-Speed A/T) (2019 22020 2021)
   U0101-00 CAN Communication Failure with TCM (i-VTM Control Unit)	i-VTM control unit
   U0104-00 CAN Communication Failure with ACC	Multipurpose Camera Unit
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor	Steering Angle Sensor
   U0155-00 CAN Communication Failure with METER	Gauge Control Module

   NO 

   Repair an open in the F-CAN_H and/or F-CAN_L wires between the receiving control unit and the transmitting control unit.