DTC U0127 (Gauge Control Module (With CAN Gateway)) (2019 2020)

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

DTC (Gauge Control Module)

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

   Is DTC U0127 indicated?

   YES 

   Go to step 2.

   NO 

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

2. 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 3.

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.

4. 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 connector A (32P)

   CAN gateway 16P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Gauge control module connector A (32P): disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	Gauge control module connector A (32P) No. 27 - Refer to: Gauge Control Module Input Test (2017 2018 2019 2020)
   Test point 2	CAN gateway 16P connector No. 3

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

   Is there continuity?

   YES 

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

   NO 

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

5. 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 connector A (32P): disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	Gauge control module connector A (32P) No. 28 - Refer to: Gauge Control Module Input Test (2017 2018 2019 2020)
   Test point 2	CAN gateway 16P connector No. 11

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

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Replace the gauge control module .

   NO 

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

6. 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 16P 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 16P 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 (2017 2018 2019 2020),
   Test point 2	CAN gateway 16P connector No. 6

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

   Is there continuity?

   YES 

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

   NO 

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

7. 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 16P 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 (2017 2018 2019 2020),
   Test point 2	CAN gateway 16P connector No. 14

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

   Is there continuity?

   YES 

   The F-CAN B_L wire is OK. Replace the keyless access/TPMS control unit .

   NO 

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