DTC: U0122(Gauge Control Module) (2013 2014 2015 2016 2017 2018)

DTC U0122  : Gauge Control Module Lost Communication With VSA Modulator-Control Unit (VSA Message)

DTC (Gauge Control Module)

NOTE: 

• If you have any loss of communication DTCs for the PCM, troubleshoot those DTCs first.
• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Press the engine start/stop button to select the OFF 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 (VSA Message)

   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. B24 (7.5 A)
   Location	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. B24 (7.5 A) fuse circuit.

3. Open wire check (IG1 VSA/ABS line)

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Disconnect the following connector.

   VSA modulator-control unit 22P connector

   -3. Press the engine start/stop button to select the ON mode.

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

   Test condition	ON modeVSA modulator-control unit 22P connector: disconnected
   Test circuit	IG1 VSA/ABS
   Test point 1	VSA modulator-control unit 22P connector No. 8 (GRY)
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IG1 VSA/ABS wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the wire.

4. Open wire check (GND line)

   -1. Press the engine start/stop button to select the OFF mode.

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

   Test condition	OFF modeVSA modulator-control unit 22P connector: disconnected
   Test circuit	GND
   Test point 1	VSA modulator-control unit 22P connector No. 1 (BRN)
   Test point 2	Body ground

   Test circuit	GND
   Test point 1	VSA modulator-control unit 22P connector No. 2 (BRN)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The GND wires are OK. Go to step 5.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G202).

5. Open wire check (F CAN lines)

   -1. Disconnect the following connector.

   Gauge control module 32P connector

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

   Test condition	OFF modeVSA modulator-control unit 22P connector: disconnectedGauge control module 32P connector: disconnected
   Test circuit	F CAN-H
   Test point 1	VSA modulator-control unit 22P connector No. 10 (WHT)
   Test point 2	Gauge control module 32P connector No. 23 (WHT)

   Test circuit	F CAN-L
   Test point 1	VSA modulator-control unit 22P connector No. 15 (RED)
   Test point 2	Gauge control module 32P connector No. 24 (RED)

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

   Is there continuity?

   YES 

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

   NO 

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