DTC U0100: Power Control Unit Lost Communication With PCM (V6, Keyless Access Power Control Unit with CAN gateway) (2015-17)

DTC Description	DTC
U0100 Power control unit lost communication with PCM

DTC (Power Control Unit)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and 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) .

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) - Refer to: Communication Systems DTC Troubleshooting Index (V6, With CAN gateway) (2015-17) or Communication Systems DTC Troubleshooting Index (2018-19) .

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 Bus Connected Unit Check

Which result is indicated?

PCM (Bus A) is Not Available

Go to step 3.

PCM (Bus B) is Not Available

Go to step 5. Refer to: 5

KEYLESS ACCESS/TPMS CONTROL UNIT (Bus B) is Not Available

Go to step 7. Refer to: 7

PCM and KEYLESS ACCESS/TPMS CONTROL UNIT are Detected

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the keyless access/TPMS control unit, the CAN gateway, and the PCM.

Open wire check (F-CAN A_H line)

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

- 2. Jump the SCS line with the HDS.

- 3. Disconnect the following connectors.

CAN gateway 24P connector

PCM connector A (51P)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 24P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 24P connector No. 14
Test point 2	PCM connector A (51P) No. 9 - 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)

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

Is there continuity?

YES

The F-CAN A_H wire is OK. Go to step 4.

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

Open wire check (F-CAN A_L line)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 24P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 24P connector No. 15
Test point 2	PCM connector A (51P) No. 10 - 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)

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

Is there continuity?

YES

The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Update the PCM if it does not have the latest software, or 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 updated, troubleshooting is complete. 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) .

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

Open wire check (F-CAN B_H line)

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

- 2. Jump the SCS line with the HDS.

- 3. Disconnect the following connectors.

CAN gateway 24P connector

PCM connector A (51P)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 24P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 24P connector No. 11
Test point 2	PCM connector A (51P) No. 11 - 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)

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

Is there continuity?

YES

The F-CAN B_H wire is OK. Go to step 6.

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

Open wire check (F-CAN B_L line)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 24P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 24P connector No. 10
Test point 2	PCM connector A (51P) No. 12 - 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)

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

Is there continuity?

YES

The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Update the PCM if it does not have the latest software, or 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 updated, troubleshooting is complete. If DTC U0100 is not indicated 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) .

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

Open wire check (F-CAN B_H line)

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

- 2. Disconnect the following connectors.

CAN gateway 24P connector

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 24P connector: disconnected
	Keyless access/TPMS control unit connector C (20P): disconnected
Test point 1	CAN gateway 24P connector No. 11
Test point 2	Keyless access/TPMS control unit connector C (20P) No. 2

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

Is there continuity?

YES

The F-CAN B_H wire is OK. Go to step 8.

Repair an open in the F-CAN B_H wire between the CAN gateway and the keyless access/TPMS control unit.

Open wire check (F-CAN B_L line)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 24P connector: disconnected
	Keyless access/TPMS control unit connector C (20P): disconnected
Test point 1	CAN gateway 24P connector No. 10
Test point 2	Keyless access/TPMS control unit connector C (20P) No. 12

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

Is there continuity?

YES

The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the keyless access/TPMS control unit. Substitute a good-known keyless access/TPMS control unit , then recheck. If DTC U0100 is not indicated the keyless access/TPMS control unit was substituted, replace the original keyless access/TPMS control unit .

Repair an open in the F-CAN B_L wire between the CAN gateway and the keyless access/TPMS control unit.