DTC: U0100-00, U0101-00, 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 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 .
• According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the VSA modulator-control unit.

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
   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. 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 following connectors according to the detected DTC.

   DTC	Connector
   U0100-00	PCM connector A (51P)
   U0101-00	PCM connector A (51P)
   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.

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

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 38P connector: disconnected
   	Transmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN_H	VSA modulator-control unit 38P connector - 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)	No. 6	PCM connector A (51P) - Refer to: 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) or PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2020) .	No. 9
   	F-CAN_L		No. 7		No. 10
   U0101-00	F-CAN_H	VSA modulator-control unit 38P connector - 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)	No. 6	PCM connector A (51P) - 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)	No. 9
   	F-CAN_L		No. 7		No. 10
   U0126-00	F-CAN_H	VSA modulator-control unit 38P connector - 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)	No. 6	Steering angle sensor 4P connector (female terminals):	No. 2
   	F-CAN_L		No. 7		No. 3
   U0155-00	F-CAN_H	VSA modulator-control unit 38P connector - 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)	No. 6	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_L		No. 7		No. 20

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

   Is there continuity?

   YES 

   The F-CAN_H and the F-CAN_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, or PCM Removal and Installation (9-Speed A/T) (2019 2020 2021)
   U0126-00	Steering Angle Sensor
   U0155-00	Gauge Control Module

   NO 

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