DTC: U0100-00, U0101-00, U0101-00, U0104-00, U0126-00, U0155-00 (2019 2020)

DTC U0100-00  : CAN Communication Failure with ECM/ISU

DTC U0101-00  : CAN Communication Failure with PCM/TCM

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

DTC U0104-00  : CAN Communication Failure with Driving Support System Control Unit

DTC U0126-00  : CAN Communication Failure with Absolute Steering Wheel Angle Sensor

DTC U0155-00  : CAN Communication Failure with Meter

NOTE: 

• Before You Troubleshoot, Review The General Troubleshooting Information .
• If more than one DTC codes are listed in Troubleshooting, refer to relevant information only.
• These DTC(s) may be stored due to the power/ground circuit failure of the appropriate transmitting control unit. Before this troubleshooting, check the power/ground circuit of the appropriate transmitting control unit first.

DTC (VSA)

1. DTC check

   -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. Test-drive the vehicle at 6 mph (10 km/h) or more.

   NOTE:  Drive the vehicle on the road, not on a lift.

   - 5. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100-00 CAN Communication Failure with ECM/ISU
   U0101-00 CAN Communication Failure with PCM/TCM
   U0101-00 CAN Communication Failure with PCM/TCM (i-VTM Control Unit / 6-Speed A/T)

   DTC Description	DTC
   U0104-00 CAN Communication Failure with Driving Support System Control Unit
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor
   U0155-00 CAN Communication Failure with Meter

   Is DTC indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer To Intermittent Failures Troubleshooting .

2. DTC check (CAN gateway system)

   -1. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC

   Is DTC indicated?

   YES 

   Go To Indicated DTC's Troubleshooting .

   NO 

   Go to step 3.

3. F-CAN circuit communication check (Receiving control unit)

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   Which result is indicated?

   VSA modulator-control unit (Bus A) is Not Available

   Go to step 4.

   VSA modulator-control unit (Bus A) is Available

   Go to step 5.

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

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

   - 2. Disconnect the following connectors.

   VSA modulator-control unit 38P connector

   CAN gateway 16P connector

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 38P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test circuit 1
   Test point 1	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)
   Test point 2	CAN gateway 16P connector (female terminals) No. 3:

   Test circuit 2
   Test point 1	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)

   Test point 2

   CAN gateway 16P connector (female terminals) No. 11:

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

   Is there continuity?

   YES 

   The F-CAN A_H and the F-CAN A_L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If they are OK, Replace The VSA Modulator-Control Unit. Refer to:

   Replace The VSA Modulator-Control Unit

   NO 

   Repair an open in the F-CAN A_H and/or the F-CAN A_L wire(s) between the VSA modulator-control unit and the CAN gateway.

5. F-CAN circuit communication check (Transmitting control unit)

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   According to the detected DTC on the following table, make sure that the transmitting control unit detects the CAN gateway Bus channel(s) normally.

   DTC	Transmitting control unit	Detected CAN getaway Bus channel(s) at normal
   U0100-00	PCM	A
   U0101-00	PCM	A
   U0101-00	i-VTM control unit	A
   U0104-00	Multipurpose camera unit	A
   U0126-00	Steering angle sensor	A
   U0155-00	Gauge control module	A

   Is it detected normally?

   Detected normal

   Intermittent failure, the system is OK at this time. Refer To Intermittent Failures Troubleshooting .

   U0100-00: PCM (Bus A) is Not Available

   Go to step 6.

   U0101-00: PCM (Bus A) is Not Available

   Go to step 6.

   U0101-00: i-VTM Control Unit (Bus A) is Not Available

   Go to step 6.

   U0104-00: Multipurpose camera unit (Bus A) is Not Available

   Go to step 6.

   U0126-00: Steering angle sensor (Bus A) is Not Available

   Go to step 6.

   U0155-00: Gauge control module (Bus A) is Not Available

   Go to step 6.

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

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

   - 2. Disconnect the following connectors according to the detected DTC.

   DTC	Connector
   -	CAN gateway 16P connector
   U0100-00	PCM connector A (51P)
   U0101-00	PCM connector A (51P)
   U0101-00	i-VTM control unit 24P Connector
   U0104-00	Multipurpose camera unit 20P connector
   U0126-00	Steering angle sensor 4P connector
   U0155-00	Gauge control module connector A (32P)

   NOTE:  Before disconnecting the PCM connector, jump the SCS line with the HDS, and wait for more than 1 minute.

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Transmitting control unit connector(s) for indicated DTCs: disconnected
   	CAN gateway 16P connector: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (51P) - Refer to: 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) (2019 2020 2021) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) .	No. 9
   	F-CAN A_L		No. 11		No. 10
   U0101-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (51P) - Refer to: 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) (2019 2020 2021) or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018) .	No. 9
   	F-CAN A_L		No. 11		No. 10
   U0101-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	i-VTM control unit 24P Connector - 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)	No. 14
   	F-CAN A_L		No. 11		No. 24
   U0104-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Multipurpose camera unit 20P connector - 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)	No. 2
   	F-CAN A_L		No. 11		No. 13
   U0126-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Steering angle sensor 4P connector (female terminals):	No. 2
   	F-CAN A_L		No. 11		No. 3
   U0155-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Gauge control module connector A (32P) - 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) .	No. 19
   	F-CAN A_L		No. 11		No. 20

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

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

   Is there continuity?

   YES 

   The F-CAN A_H and the F-CAN A_L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. According to the detected DTC on the following table, substitute or replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0100-00	PCM - Refer to: PCM Removal and Installation, or PCM Removal and Installation (9-Speed A/T) (2019 2020 2021)
   U0101-00	PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) or PCM Removal and Installation
   U0101-00	i-VTM Control Unit
   U0104-00	Multipurpose Camera Unit
   U0126-00	Steering Angle Sensor
   U0155-00	Gauge Control Module

   NO 

   Repair an open in the F-CAN A_H and/or the F-CAN A_L wire(s) between the receiving control unit and the transmitting control unit.