DTC U0100-00, U0101-00, U0122-00, U0126-00 (AWD, With Multipurpose Camera Unit) (2019 2020 2021)

WARNING: This page is about a different variant/trim than selected.

DTC U0100-00 : F-CAN Malfunction (Lost Communication with Powertrain Control Module (PCM))DTC U0101-00 : F-CAN Malfunction (Lost Communication with A/T Control System)DTC U0122-00 : F-CAN Malfunction (Lost Communication with VSA Modulator-Control Unit)DTC U0126-00 : F-CAN Malfunction (Lost Communication with Steering Angle Sensor)

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 AWD control unit.

DTC Description	DTC	Freeze Frame
U0100-00 F-CAN Malfunction (Lost Communication with Powertrain Control Module (PCM))
U0101-00 F-CAN Malfunction (Lost Communication with A/T Control System)
U0122-00 F-CAN Malfunction (Lost Communication with VSA Modulator-Control Unit)
U0126-00 F-CAN Malfunction (Lost Communication with Steering Angle Sensor)

DTC (AWD)

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

Are any DTCs 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 Bus Connected Check.

F-CAN Bus Connected Unit Check

Which result is indicated?

Bus B is Not Available

Go to step 3.

Bus B is Available

Go to step 4.

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

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

-2. Disconnect the following connectors.

CAN gateway 16P connector

AWD control unit 24P connector

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

F-CAN B_H

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	AWD control unit 24P connector: disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 6:
Test point 2	AWD control unit 24P connector No. 14

F-CAN B_L

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	AWD control unit 24P connector: disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 14:
Test point 2	AWD control unit 24P connector No. 24

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 AWD control unit. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good AWD control unit , then recheck. If indicated DTC goes away and the AWD control unit was substituted, replace the original AWD control unit .

Repair an open in the F-CAN B_H wire and/or the F-CAN B_L wire between the AWD control unit 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 Bus Connected 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 gateway Bus channel(s) at normal
U0100-00	PCM	A
U0101-00	PCM	A
U0122-00	VSA modulator-control unit	B
U0126-00	Steering angle sensor	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.

U0100-00: PCM is Not Available for Bus A

Go to step 5.

U0101-00: PCM is Not Available for Bus A

Go to step 5.

U0122-00: VSA modulator-control unit is Not Available for Bus B

Go to step 6.

U0126-00: Steering angle sensor is Not Available for Bus B

Go to step 6.

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

DTC	Connector
-	CAN gateway 16P connector
U0100-00	PCM connector A (51P)
U0101-00	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
	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
U0100-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (51P)	No. 3
U0100-00	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11	PCM connector A (51P)	No. 4
U0101-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (51P)	No. 3
U0101-00	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11	PCM connector A (51P)	No. 4

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
U0100-00	Check for poor connections or loose terminals at the CAN gateway and the PCM. Substitute a known-good PCM , then recheck. If DTC U0100-00 goes away and the PCM was substituted, replace the original PCM .
U0101-00	Check for poor connections or loose terminals at the CAN gateway and the PCM. Substitute a known-good PCM , then recheck. If DTC U0101-00 goes away and the PCM was substituted, replace the original PCM .

Repair an open in the F-CAN A_H wire and/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
U0122-00	VSA modulator-control unit 21P connector
U0126-00	Steering angle sensor 4P connector

-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
U0122-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 21P connector	No. 8
U0122-00	F-CAN B_L	CAN gateway 16P connector (female terminals):	No. 14	VSA modulator-control unit 21P connector	No. 15
U0126-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	Steering angle sensor 4P connector (female terminals):	No. 2
U0126-00	F-CAN B_L	CAN gateway 16P connector (female terminals):	No. 14	Steering angle sensor 4P connector (female terminals):	No. 3

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

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
U0122-00	Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit .
U0126-00	Check for poor connections or loose terminals at the CAN gateway and the steering angle sensor. Substitute a known-good steering angle sensor , then recheck. If DTC U0126-00 goes away and the steering angle sensor was substituted, replace the original steering angle sensor .

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