DTC U0127 (Gauge Control Module (With CAN Gateway)) (2016 2017 2018)

DTC U0127 : Gauge control module lost communication with TPMS control unit

DTC Description	DTC
U0127 Gauge control module lost communication with TPMS control unit

DTC (Gauge Control Module)

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 (2014 2015 2016 2017 2018 2019 2020) or

How to Troubleshoot the Fuel and Emissions Systems (With Auto Idle Stop System) (2016 2017 2018 2019 2020)

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
U0127 Gauge Control Module Lost Communication With Keyless Access/TPMS Control Unit

Is DTC U0127 indicated?

YES

Go to step 2.

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

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) .

Go to step 3.

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?

GAUGE CONTROL MODULE (Bus A) is Not Available

Go to step 4.

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

Go to step 6.

GAUGE CONTROL MODULE and TPMS CONTROL UNIT are Detected

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

Open wire check (F-CAN A_H line)

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

- 2. Disconnect the following connectors.

Gauge control module 32P connector

CAN gateway 24P connector

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

Test condition	Vehicle OFF (LOCK) mode
	Gauge control module 32P connector: disconnected
	CAN gateway 24P connector: disconnected
Test point 1	Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Input Test (2016), or Gauge Control Module Input Test (2017 2018 2019 2020)
Test point 2	CAN gateway 24P connector No. 14

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

Is there continuity?

YES

The F-CAN A_H wire is OK. Go to step 5.

Repair an open in the F-CAN A_H wire between the gauge control module 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
	Gauge control module 32P connector: disconnected
	CAN gateway 24P connector: disconnected
Test point 1	Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Input Test (2016), or Gauge Control Module Input Test (2017 2018 2019 2020)
Test point 2	CAN gateway 24P connector No. 15

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 gauge control module. Substitute a known-good gauge control module , then recheck. If DTC U0127 is not indicated the gauge control module was substituted, replace the original gauge control module .

Repair an open in the F-CAN A_L wire between the gauge control module 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.

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

CAN gateway 24P connector

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

Test condition	Vehicle OFF (LOCK) mode
	Keyless access/TPMS control unit connector C (20P): disconnected
	CAN gateway 24P connector: disconnected
Test point 1	Keyless access/TPMS control unit connector C (20P) No. 2 - Refer to: Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2016), or Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2017 2018 2019 2020),
Test point 2	CAN gateway 24P connector No. 11

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

Is there continuity?

YES

The F-CAN B_H wire is OK. Go to step 7.

Repair an open in the F-CAN B_H wire between the keyless access/TPMS control unit 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
	Keyless access/TPMS control unit connector C (20P): disconnected
	CAN gateway 24P connector: disconnected
Test point 1	Keyless access/TPMS control unit connector C (20P) No. 12 - Refer to: Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2016), or Keyless Access System (Keyless Access Control Unit, Electric Steering Lock, and TPMS Control Unit) Input Test (2017 2018 2019 2020),
Test point 2	CAN gateway 24P connector No. 10

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 known-good keyless access/TPMS control unit , then recheck. If DTC U0127 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 keyless access/TPMS control unit and the CAN gateway.