DTC U0100, U0104, U0122, U0127, U0128, U0131, U0151, U1100, U129D: Gauge Control Module Lost Communication (L4, Gauge Control Module) (2018-19)

DTC (Gauge Control Module)

NOTE

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems (L4), or How to Troubleshoot the Dual Clutch Transmission (DCT), or How to Troubleshoot the Brake Booster Pressure Monitoring System (With Auto Idle Stop System), or How to Troubleshoot the Fuel and Emissions Systems (V6, Without Auto Idle Stop System), or How to Troubleshoot the Fuel and Emissions Systems (V6, With Auto Idle Stop System) .
• 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.

1. Problem verification

   -1. Clear the DTCs with the HDS.

   - 2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   - 3. Wait for at least 6 seconds.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100 Gauge control module lost communication with ENG/AT
   U0104 Gauge Control Module Lost Communication With Driving Support System Control Unit
   U0122 Gauge control module lost communication with VSA modulator-control unit
   U0127 Gauge control module lost communication with TPMS control unit
   U0128 Gauge control module lost communication with EPB
   U0131 Gauge control module lost communication with EPS Unit
   U0151 Gauge control module lost communication with SRS unit
   U1100 Gauge Control Module Lost Communication With Driving Support System Control Unit
   U129D Gauge control module lost communication with precision all wheel steer control unit

   Are any DTCs indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals.

2. 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
   U3000-49 CAN Gateway Internal Failure

   DTC (CAN Gateway)

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

   YES 

   Go to the troubleshooting for CAN gateway system DTC (s) - Refer to: Communication Systems DTC Troubleshooting Index (V6, With CAN gateway) (2015-17) or Communication Systems DTC Troubleshooting Index (2018-19) .

   NO 

   Go to step 3.

3. 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 Unit Check.

   F-CAN Bus Connected Unit Check

   Does the receiving control unit detect the CAN gateway Bus channels A?

   Bus A is Not Available

   Go to step 4.

   Bus A is Available

   Go to step 5.

4. Open wire check (F-CAN lines)

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

   - 2. Disconnect the following connectors.

   CAN gateway 16P connector Gauge control module 32P connector

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

   Test condition	Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Gauge control module 32P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 3:
   Test point 2	Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Connector For Inputs And Outputs (Without SH-AWD) (2015-17), or Gauge Control Module Connector For Inputs And Outputs (With SH-AWD) (2015-17), or Gauge Control Module Connector for Inputs and Outputs (2018-19)

   Test point 1	CAN gateway 16P connector (female terminals) No. 11:
   Test point 2	Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Connector For Inputs And Outputs (Without SH-AWD) (2015-17), or Gauge Control Module Connector For Inputs And Outputs (With SH-AWD) (2015-17), or Gauge Control Module Connector for Inputs and Outputs (2018-19)

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

   Is there continuity?

   YES 

   The F-CAN_H and F-CAN_L wires are OK. Replace the gauge control module .

   NO 

   Repair an open in F-CAN_H or F-CAN_L wire.

5. 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
   U0104	Multipurpose camera unit	A
   U0122	VSA modulator-control unit	A
   U0127	Keyless access/TPMS control unit	A
   U0128	Electric parking brake control unit	A
   U0131	EPS control unit	A
   U0151	SRS unit	A
   U1100	Multipurpose camera unit	A
   U129D	Precision all wheel steer 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 6.

   U0104: Multipurpose camera 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.

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

   Go to step 6.

   U0128: Electric parking brake control unit 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.

   U1100: Multipurpose camera unit is Not Available for Bus A

   Go to step 6.

   U129D: Precision all wheel steer control unit is Not Available for Bus A

   Go to step 6.

6. Open wire check (F-CAN 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.

   - 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 (51P)
   U0104	Multipurpose camera unit 20P connector
   U0122	VSA modulator-control unit 38P connector
   U0127	Keyless access/TPMS control unit connector C (20P)
   U0128	Electric parking brake control unit 30P connector
   U0131	EPS control unit connector A (11P)
   U0151	SRS unit connector A (39P)
   U1100	Multipurpose camera unit 20P connector
   U0129D	Precision all wheel steer control unit connector A (16P)

   - 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)
   		Connector	Terminal	Connector	Terminal
   U0100	F-CAN_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (51P) - Refer to: PCM Connector for Inputs and Outputs (L4) (2015-17) or PCM Connector for Inputs and Outputs (V6, Without Auto Idle Stop System) (2015-17) or PCM Connector for Inputs and Outputs (V6, With Auto Idle Stop System) (2015-17), or PCM Connector for Inputs and Outputs (L4) (2018-19), or PCM Connector for Inputs and Outputs (V6) (2018-19)	No. 2
   	F-CAN_L		No. 11		No. 3
   U0104 U1100	F-CAN_H	CAN gateway 16P connector (female terminals):	No. 3	Multipurpose camera unit 20P connector - Refer to: Multipurpose Camera Unit Connector for Inputs and Outputs (2015-17) or Multipurpose Camera Unit Connector for Inputs and Outputs (2018-19)	No. 2
   	F-CAN_L		No. 11		No. 13
   U0122	F-CAN_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 (With Auto Idle Stop System) (2015-17) or VSA Modulator-Control Unit Connector For Inputs And Outputs (Without Auto Idle Stop System) (2015-17) or VSA Modulator-Control Unit Connector for Inputs and Outputs (2018-19)	No. 38
   	F-CAN_L		No. 11		No. 26
   U0127	F-CAN_H	CAN gateway 16P connector (female terminals):	No. 3	Keyless access/TPMS control unit connector C (20P) - Refer to: Keyless Access/TPMS Control Unit Connector For Inputs And Outputs (2015-17) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2018-19)	No. 2
   	F-CAN_L		No. 11		No. 12
   U0128	F-CAN_H	CAN gateway 16P connector (female terminals):	No. 3	Electric parking brake control unit 30P connector - Refer to: Electric Parking Brake Control Unit Connector for Inputs and Outputs (2015-17) or Electric Parking Brake Control Unit Connector for Inputs and Outputs (2018-19)	No. 30
   	F-CAN_L		No. 11		No. 29
   U0131	F-CAN_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 (With Auto Idle Stop System) (2015-17) or EPS Control Unit Connector for Inputs and Outputs (Without Auto Idle Stop System) (2015-17) or EPS Control Unit Connector for Inputs and Outputs (2018-19)	No. 10
   	F-CAN_L		No. 11		No. 11
   U0151	F-CAN_H	CAN gateway 16P connector (female terminals):	No. 3	SRS unit connector A (39P) - Refer to: SRS Unit Connector For Inputs And Outputs (2015-17) or SRS Unit Connector for Inputs and Outputs (2018-19)	No. 34
   	F-CAN_L		No. 11		No. 35
   U129D	F-CAN_H	CAN gateway 16P connector (female terminals):	No. 3	Precision all wheel steer control unit connector A (16P) - Refer to: Precision All Wheel Steer Control Unit Connector for Inputs and Outputs (2015-17) or Precision All Wheel Steer Control Unit Connector for Inputs and Outputs (2018-19)	No. 6
   	F-CAN_L		No. 11		No. 14

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

   Is there continuity?

   YES 

   The F-CAN_H wire and the F-CAN_L wire are OK.

   Refer to the DTC shown on the display, substitute or replace the control unit based on the instructions (see table).

   DTC	Operation for transmitting control unit
   U0100	Substitute a known-good PCM - Refer to: PCM Removal and Installation (With SH-AWD), or PCM Removal and Installation (Without SH-AWD) , then recheck. If DTC U0100 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (With SH-AWD), or PCM Removal and Installation (Without SH-AWD) .
   U0104	Substitute a known-good multipurpose camera unit , the recheck. If DTC U0104 goes away after substitution, replace the original multipurpose camera unit .
   U0122	Replace the VSA modulator-control unit - Refer to: VSA Modulator-Control Unit Removal and Installation (With SH-AWD), or VSA Modulator-Control Unit Removal and Installation (Without SH-AWD) .
   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 .
   U0128	Substitute a known-good electric parking brake control unit , then recheck. If DTC U0128 goes away after substitution, replace the original electric parking brake control unit
   U0131	Substitute a known-good EPS control unit , the recheck. If DTC U0131 goes away after substitution, replace the original EPS control unit .
   U0151	Substitute a known-good SRS unit - Refer to: SRS Unit Removal and Installation (2015-17) or SRS Unit Removal and Installation (2018-19) , then recheck. If DTC U0151 goes away after substitution, replace the original SRS unit - Refer to: SRS Unit Removal and Installation (2015-17) or SRS Unit Removal and Installation (2018-19) .
   U1100	Substitute a known-good multipurpose camera unit , the recheck. If DTC U1100 goes away after substitution, replace the original multipurpose camera unit .
   U0129D	substitute a known-good precision all wheel steer control unit , then recheck. If DTC U129D goes away after substitution, replace the precision all wheel steer control unit

   NO 

   Repair an open in F-CAN_H or F-CAN_L wire.