DTC U0101, U0104, U0114, U0122, U0126, U0131, U0151, U0155, U1101, U129E

DTC U0101 : F-CAN Malfunction (PCM-TCM)DTC U0104 : F-CAN Malfunction (PCM-ACC Unit/Multipurpose Camera Unit)DTC U0114 : F-CAN Malfunction (PCM-SH-AWD Control Unit)DTC U0122 : F-CAN Malfunction (PCM-VSA Modulator-Control Unit)DTC U0126 : F-CAN Malfunction (PCM-Steering Angle Sensor)DTC U0131 : F-CAN Malfunction (PCM-EPS Control Unit)DTC U0151 : F-CAN Malfunction (PCM-SRS Unit)DTC U0155 : F-CAN Malfunction (PCM-Gauge Control Module)DTC U1101 : F-CAN Malfunction (PCM-ACM)DTC U129E : F-CAN Malfunction (PCM-PCU)

NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016 2017 2018 2019 2020) .

According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the PCM.

DTC Description	Confirmed DTC	Pending DTC
U0101 F-CAN Malfunction (PCM-TCM)
U0104 F-CAN Malfunction (PCM-ACC Unit/MULTIPURPOSE CAMERA unit)
U0114 F-CAN Malfunction (PCM-SH-AWD Control Unit)
U0122 F-CAN Malfunction (PCM-VSA Modulator-Control Unit)
U0126 F-CAN Malfunction (PCM- Steering Angle Sensor)
U0131 F-CAN Malfunction (PCM-EPS Control Unit)
U0151 F-CAN Malfunction (PCM-SRS Unit)
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
U1101 F-CAN Malfunction (PCM-ACM)
U129E F-CAN Malfunction (PCM-Power Control Unit (PCU))

DTC (PGM-FI)

CAN gateway system DTC check

-1. Turn the vehicle to the ON mode.

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

DTC Description	DTC
U0029-00 CAN Gateway F-CAN ch A Bus Off
U0047-00 CAN Gateway F-CAN ch B Bus Off
U3000-49 CAN Gateway Internal Failure

Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?

YES

Go to the troubleshooting for CAN gateway system DTC(s) .

Go to step 2.

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 Connection Check.

F-CAN Bus Connected Unit Check

Does the PCM detect the CAN gateway Bus channels A and B?

Bus A is Not Available

Go to step 3.

Bus B is Not Available

Go to step 4.

Bus A and B are Available

Go to step 5.

Open wire check (F-CAN A_H line, F-CAN A_L line)

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

- 2. Jump the SCS line with the HDS, and wait more than 1 minute.

- 3. Disconnect the following connectors.

CAN gateway 16P connector

PCM connector A (51P)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 3:
Test point 2	PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020)

Test point 1	CAN gateway 16P connector (female terminals) No. 11:
Test point 2	PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020),

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

Is there continuity?

YES

The F-CAN A_H wire and the F-CAN A_L wire are OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) .

Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the PCM (A9, A10) and the CAN gateway.

Open wire check (F-CAN B_H line, F-CAN B_L line)

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

- 2. Jump the SCS line with the HDS, and wait more than 1 minute.

- 3. Disconnect the following connectors.

CAN gateway 16P connector

PCM connector A (51P)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 6:
Test point 2	PCM connector A (51P) No. 11 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020),

Test point 1	CAN gateway 16P connector (female terminals) No. 14:
Test point 2	PCM connector A (51P) No. 12 - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020),

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

Is there continuity?

YES

The F-CAN B_H wire and the F-CAN B_L wire are OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) .

Repair an open in the F-CAN B_H wire or the F-CAN B_L wire between the PCM (A11, A12) and the CAN gateway.

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 Connection Check.

- 2. 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 gateway Bus channel(s) at normal
U0101	TCM	A, B
U0104	Multipurpose camera unit	A
U0114	SH-AWD control unit	A
U0122	VSA modulator-control unit	A, B
U0126	Steering angle sensor	A
U0131	EPS control unit	A
U0151	SRS unit	A

DTC	Transmitting control unit	Detected CAN gateway Bus channel(s) at normal
U0155	Gauge control module	A
U1101	ACM	B
U129E	PCU	B

Is it detected normally?

Detected normal

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control unit and the CAN gateway.

U0101: TCM is Not Available for Bus A

Go to step 6.

U0101: TCM is Not Available for Bus B

Go to step 7.

U0104: Multipurpose camera unit is Not Available for Bus A

Go to step 6.

U0114: SH-AWD control unit is Not Available for Bus A

Go to step 6.

U0122: VSA modulator-control unit is Not Available for Bus A

Go to step 6.

U0122: VSA modulator-control unit is Not Available for Bus B

Go to step 7.

U0126: Steering angle sensor is Not Available for Bus A

Go to step 6.

U0131: EPS control unit is Not Available for Bus A

Go to step 6.

U0151: SRS unit is Not Available for Bus A

Go to step 6.

U0155: Gauge control module is Not Available for Bus A

Go to step 6.

U1101: ACM is Not Available for Bus B

Go to step 7.

U129E: PCU is Not Available for Bus B

Go to step 7.

Open wire check (F-CAN A_H line, F-CAN A_L line)

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

- 2. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

DTC	Connector
-	CAN gateway 16P connector
U0101	TCM 58P connector
U0104	Multipurpose camera unit 20P connector
U0114	SH-AWD control unit 24P connector
U0122	VSA modulator-control unit 38P connector
U0126	Steering angle sensor 4P connector
U0131	EPS control unit connector A (11P)
U0151	SRS unit connector A (39P)
U0155	Gauge control module connector A (32P)

NOTE: Before disconnecting SRS unit connector A (39P), do the 12 volt battery terminal disconnection procedure - Refer to: Battery Terminal Disconnection and Reconnection (2016 2017 2018 2019 2020) and wait for at least 3 minutes.

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

Test condition

Vehicle OFF (LOCK) mode

	CAN gateway 16P 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)
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0101	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	TCM 58P connector	No. 34
U0101	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11	TCM 58P connector	No. 47
U0104	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 (2017 2018 2019 2020),	No. 2
U0104	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11		No. 13
U0114	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	SH-AWD control unit 24P connector - Refer to: SH-AWD Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)	No. 14
U0114	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11		No. 24
U0122	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	VSA modulator-control unit 38P connector - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)	No. 38
U0122	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11		No. 26
U0126	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Steering angle sensor 4P connector (female terminals):	No. 2
U0126	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11	Steering angle sensor 4P connector (female terminals):	No. 3
U0131	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	EPS control unit connector A (11P) - Refer to: EPS Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020),	No. 10
U0131	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11		No. 11
U0151	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	SRS unit connector A (39P) - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020),	No. 34
U0151	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11		No. 35
U0155	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Gauge control module connector A (32P) - Refer to: Gauge Control Module Input Test (2017 2018 2019 2020)	No. 27
U0155	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11		No. 28

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

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

Is there continuity?

YES

The F-CAN A_H wire and the F-CAN A_L wire are OK.According to the detected DTC on the following table, substitute, or replace the correspond control unit.

DTC	Operation for transmitting control unit
U0101	Check for poor connections or loose terminals at the CAN gateway and the TCM. Substitute a known-good TCM .
U0104	Check for poor connections or loose terminals at the CAN gateway and the multipurpose camera unit. Substitute a good-known multipurpose camera unit .
U0114	Check for poor connections or loose terminals at the CAN gateway and the SH-AWD control unit. Substitute a known-good SH-AWD control unit - Refer to: SH-AWD® Control Unit Removal and Installation(SH-AWD) (2016 2017 2018 2019 2020) .

DTC	Operation for transmitting control unit
U0122	Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit .
U0126	Check for poor connections or loose terminals at the CAN gateway and the steering angle sensor. Substitute a good-known steering angle sensor .
U0131	Check for poor connections or loose terminals at the CAN gateway and the EPS control unit. Substitute a known-good EPS control unit .
U0151	Check for poor connections or loose terminals at the CAN gateway and the SRS unit. Substitute a known-good SRS unit - Refer to: SRS Unit Removal and Installation (2017 2018 2019 2020), .
U0155	Check for poor connections or loose terminals at the CAN gateway and the gauge control module. Substitute a known-good gauge control module .

Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the transmitting control unit and the CAN gateway.

Open wire check (F-CAN B_H line, F-CAN B_L line)

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

- 2. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

DTC	Connector
-	CAN gateway 16P connector
U0101	TCM 58P connector
U0122	VSA modulator-control unit 38P connector
U1101	Engine mount control unit 16P connector
U129E	Keyless access/TPMS control unit connector C (20P)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P 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)
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0101	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	TCM 58P connector	No. 7
U0101	F-CAN B_L	CAN gateway 16P connector (female terminals):	No. 14	TCM 58P connector	No. 20
U0122	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 38P connector - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)	No. 31
U0122	F-CAN B_L	CAN gateway 16P connector (female terminals):	No. 14		No. 20
U1101	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	Engine mount control unit 16P connector	No. 13
U1101	F-CAN B_L	CAN gateway 16P connector (female terminals):	No. 14	Engine mount control unit 16P connector	No. 15
U129E	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	Keyless access/TPMS control unit connector C (20P) - Refer to: Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2017 2018 2019 2020),	No. 2
U129E	F-CAN B_L	CAN gateway 16P connector (female terminals):	No. 14		No. 12

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

Is there continuity?

YES

The F-CAN B_H wire and the F-CAN B_L wire are OK.According to the detected DTC on the following table, substitute, or replace the correspond control unit.

DTC	Operation for transmitting control unit
U0101	Check for poor connections or loose terminals at the CAN gateway and the TCM. Substitute a known-good TCM .
U0122	Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit .
U1101	Check for poor connections or loose terminals at the CAN gateway and the engine mount control unit. Substitute a known-good engine mount control unit .
U129E	Check for poor connections or loose terminals at the CAN gateway and the keyless access/TPMS control unit. Substitute a known-good keyless access/TPMS control unit .

Repair an open in the F-CAN B_H wire or the F-CAN B_L wire between the transmitting control unit and the CAN gateway.