DTC : U0100, U0122 (Keyless Access Power Control Unit: 9-Speed A/T WITH CAN Gateway) (2019 2020 2021)

DTC U0100 : Power Control Unit Lost Communication with PCM

DTC U0122 : Power Control Unit Lost Communication with ABS/VSA Modulator-Control Unit

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Go to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the keyless access/TPMS control unit.
Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC Description	DTC
U0100 Power Control Unit Lost Communication with PCM
U0122 Power Control Unit Lost Communication with ABS/VSA Modulator-Control Unit

DTC (Power Control Unit)

CAN gateway system DTC check

-1. 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 Communication Systems DTC Troubleshooting (2019 2020 2021) .

Go to step 2.

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

F-CAN Connection Check

Does the keyless access/TPMS control unit detect the CAN gateway Bus channels B?

Bus B is Not Available

Go to step 3.

Bus B is Available

Go to step 4.

Open wire check (F-CAN B lines)

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

- 2. Disconnect the following connectors.

CAN gateway 16P connector Keyless access/TPMS control unit connector C (20P)

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

Test condition	Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Keyless access/TPMS control unit connector C (20P): disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 6: (1)
Test point 2	Keyless access/TPMS control unit connector C (20P) No. 2 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .

Test point 1	CAN gateway 16P connector (female terminals) No. 14: (1)
Test point 2	Keyless access/TPMS control unit connector C (20P) No. 12 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .

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

Is there continuity?

YES

The F-CAN B_H and F-CAN B_L wires are OK. Replace the Keyless Access/TPMS Control Unit - Removal and Installation .

Repair an open in F-CAN B_H or F-CAN B_L wire.

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 Connection 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	PCM	A, B
U0122	VSA modulator-control unit	A

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: PCM is Not Available for Bus A

Go to step 5.

U0100: PCM is Not Available for Bus B

Go to step 6.

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

Go to step 5.

Open wire check (F-CAN A lines)

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

- 2. U0100: Jump the SCS line with the HDS, and wait more than 1 minute.

SCS short

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

DTC -	Connector
DTC -	CAN gateway 16P connector
U0100	PCM connector A (50P)
U0122	VSA modulator-control unit 38P connector

- 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	Receiving control unit		Transmitting control unit
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0100	F-CAN A_H	CAN gateway 16P connector (female terminals) (1)	No. 3	PCM connector A (50P) - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)	No. 11
U0100	F-CAN A_L	CAN gateway 16P connector (female terminals) (1)	No. 11		No. 10
U0122	F-CAN A_H	CAN gateway 16P connector (female terminals) (1)	No. 3	VSA modulator-control unit 38P connector - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2019 2020 2021) .	No. 6
U0122	F-CAN A_L	CAN gateway 16P connector (female terminals) (1)	No. 11		No. 7

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 replace the correspond control unit.

DTC	Operation for transmitting control unit
U0100	PCM - Go to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021)
U0122	VSA modulator-control unit .

Repair an open in F-CAN A_H or F-CAN A_L wire.

Open wire check (F-CAN B lines)

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

- 2. U0100: Jump the SCS line with the HDS, and wait more than 1 minute.

SCS short

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

DTC	Connector
-	CAN gateway 16P connector
U0100	PCM connector A (50P)

- 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	Receiving control unit		Transmitting control unit
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0100	F-CAN B_H	CAN gateway 16P connector (female terminals) (1)	No. 6	PCM connector A (50P) - Go to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)	No. 13
U0100	F-CAN B_L	CAN gateway 16P connector (female terminals) (1)	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 replace the correspond control unit.

DTC	Operation for transmitting control unit
U0100	PCM - Go to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021)

Repair an open in F-CAN B_H or F-CAN B_L wire.