DTC: U0100, U0104, U0122, U0127, U0131, U0151, U1100(Gauge Control Module) (2019 2020 2021 2022)

DTC U0100  : Gauge Control Module Lost Communication with ENG/AT DTC U0104  : Gauge Control Module Lost Communication with Driving Support System Control Unit DTC U0122  : Gauge Control Module Lost Communication with VSA Modulator-Control Unit DTC U0127  : Gauge Control Module Lost Communication with TPMS Control Unit DTC U0131  : Gauge Control Module Lost Communication with EPS Unit DTC U0151  : Gauge Control Module Lost Communication with SRS Unit DTC U1100  : Gauge Control Module Lost Communication with Driving Support System Control Unit

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• 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 gauge control module.
• Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.

DTC (Gauge Control Module)

1. 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 DTC(s) .

   NO 

   Go to step 2.

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 Bus Connected Unit Check

   Does the gauge control module detect the CAN gateway Bus channels B?

   Bus B is Not Available

   Go to step 3.

   Bus B is Available

   Go to step 4.

3. Open wire check (F-CAN B lines)

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

   -2. Disconnect the following connectors.

   CAN gateway 16P connectorGauge control module 32P connector

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

   Test condition	Vehicle OFF (LOCK) modeCAN gateway 16P connector: disconnectedGauge control module 32P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 6:
   Test point 2	Gauge control module 32P connector (female terminals) No. 27:

   Test point 1	CAN gateway 16P connector (female terminals) No. 14:
   Test point 2	Gauge control module 32P connector (female terminals) No. 28:

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

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

   Is there continuity?

   YES 

   The F-CAN B_H and F-CAN B_L wires are OK. Check for poor connections or loose terminals at the CAN gateway and the gauge control module. Substitute a known-good gauge control module , then recheck. If indicated DTC goes away and the gauge control module was substituted, replace the original gauge control module .

   NO 

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

4. 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 gateway Bus channel(s) at normal
   U0100	PCM	A
   U0104U1100	Multipurpose camera unit	A
   U0122	VSA modulator-control unit	A
   U0127	Keyless access/TPMS control unit	A
   U0131	EPS control unit	A
   U0151	SRS 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.

   U0104, U1100: Multipurpose camera unit is Not Available for Bus A

   Go to step 5.

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

   Go to step 5.

   U0127: Keyless access/TPMS control unit is Not Available for Bus A

   Go to step 5.

   U0131: EPS control unit is Not Available for Bus A

   Go to step 5.

   U0151: SRS unit is Not Available for Bus A

   Go to step 5.

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. U0151: Do the battery terminal disconnection procedure , and wait for at least 3 minutes.

   -4. 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 (51P)
   U0104U1100	Multipurpose camera unit 20P connector
   U0122	VSA modulator-control unit 21P connector
   U0127	Keyless access/TPMS control unit connector C (20P)
   U0131	EPS control unit connector A (11P)
   U0151	SRS unit connector A (39P)

   -5. Check for continuity between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) modeCAN gateway 16P connector: disconnectedTransmitting control unit connector(s) for indicated DTCs: disconnected

   DTC	Circuit name	Receiving control unit		Transmitting control unit
   		Connector	Terminal	Connector	Terminal
   U0100	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (51P)	No. 2
   	F-CAN A_L		No. 11		No. 3
   U0104U1100	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Multipurpose camera unit 20P connector	No. 2
   	F-CAN A_L		No. 11		No. 13
   U0122	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	VSA modulator-control unit 21P connector	No. 8
   	F-CAN A_L		No. 11		No. 15
   U0127	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Keyless access/TPMS control unit connector C (20P) (female terminals):	No. 2
   	F-CAN A_L		No. 11		No. 12
   U0131	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	EPS control unit connector A (11P)	No. 10
   	F-CAN A_L		No. 11		No. 11
   U0151	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	SRS unit connector A (39P)	No. 20
   	F-CAN A_L		No. 11		No. 21

   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
   U0100	Substitute a known-good PCM , then recheck. If DTC U0100 goes away after substitution, replace the original PCM .
   U0104U1100	Substitute a known-good multipurpose camera unit , then recheck. If DTC U0104 and U1100 go away after substitution, replace the original multipurpose camera unit .
   U0122	Replace the VSA modulator-control unit .
   U0127	Substitute a known-good keyless access/TPMS control unit , then recheck. If DTC U0127 goes away after substitution, replace the original keyless access/TPMS control unit .
   U0131	Substitute a known-good EPS control unit , then recheck. If DTC U0131 goes away after substitution, replace the original EPS control unit .
   U0151	Substitute a known-good SRS unit , then recheck. If DTC U0151 goes away after substitution, replace the original SRS unit .

   NO 

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