DTC U0122 (Gauge Control Module (Without CAN Gateway)) (2016 2017 2018 2019 2020)

DTC U0122  : Gauge control module lost communication with VSA modulator-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)

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2014 2015 2016) or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2017 2018 2019 2020)

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
   U0122 Gauge control module lost communication with VSA modulator-control unit

   Is DTC U0122 indicated?

   YES 

   Go to step 2.

   NO 

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

2. Fuse check

   - 1. Check the following fuse.

   Fuse	No. D23 (7.5 A)
   Location	Driver's under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Replace the fuse. If the fuse blows again, repair a short to ground in the No. D23 (7.5 A) fuse circuit.

3. Open wire check (IG1 SAFETY line)

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

   - 2. Disconnect the following connector.

   VSA modulator-control unit 38P connector

   - 3. Turn the vehicle to the ON mode.

   - 4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode VSA modulator-control unit 38P connector: disconnected
   Test circuit	IG1 SAFETY
   Test point 1	VSA modulator-control unit 38P connector No. 36 (BLU)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IG1 SAFETY wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the wire.

4. Open wire check (PGND lines)

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

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

   Test condition	Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected
   Test circuit	PGND
   Test point 1	VSA modulator-control unit 38P connector No. 1 (BLK)
   Test point 2	Body ground

   Test circuit	PGND
   Test point 1	VSA modulator-control unit 38P connector No. 3 (BLK)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The PGND wires are OK. Go to step 5.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G203).

5. Open wire check (F-CAN A lines)

   - 1. Disconnect the following connector.

   Gauge control module 32P connector

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

   Test condition	Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected Gauge control module 32P connector: disconnected
   Test circuit	F-CAN A_H
   Test point 1	VSA modulator-control unit 38P connector No. 38 (WHT)
   Test point 2	Gauge control module 32P connector No. 27 (WHT)

   Test circuit	F-CAN A_L
   Test point 1	VSA modulator-control unit 38P connector No. 26 (BRN)
   Test point 2	Gauge control module 32P connector No. 28 (BRN)

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

   Is there continuity?

   YES 

   The F-CAN A wires are OK. Replace the gauge control module .

   NO 

   An open or poor connection in the F-CAN A wires between the VSA modulator-control unit and the gauge control module.