DTC U0122: Gauge Control Module Lost Communication with VSA Modulator-Control Unit (VSA message)

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )
If the HDS does not communicate with the VSA modulator-control unit, the VSA indicator stay on, and no VSA DTCs are stored, go to symptom troubleshooting for ABS indicator, brake system indicator, and VSA indicator do not go off, and no DTCs are stored (see ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF )

Clear the DTCs with the HDS
Turn the ignition switch to LOCK (0) and then back to ON (II), or press the engine start/stop button to select the OFF mode and then the ON mode
Wait for at least 6 seconds
Check for DTCs with the HDS
Is DTC U0122 indicated?

YES -Go to step 5

NO -Intermittent failure, the F-CAN communication line is OK at this time Check for DTCs in the PCM and the VSA modulator-control unit with the HDS If F-CAN DTCs are present, check for a loose VSA ground or poor connections at the VSA modulator-control unit or gauge control module If the connections are good, check the battery condition and the charging system, then clear all DTCs
Check for DTCs in the PCM or VSA with the HDS
Are any DTCs indicated?

YES -Go to the PCM or VSA indicated DTC's, troubleshooting, then recheck.

NO -Go to step 6
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Disconnect the VSA modulator-control unit 47P connector.
Check for continuity between gauge control module 32P connector terminals No. 9 and No. 10 and VSA modulator-control unit 47P connector terminals No. 13 and No. 12 respectively.

Fig 1: Checking For Continuity Between Gauge Control Module 32P Connector Terminals And VSA Modulator-Control Unit 47P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), and recheck. If the indication goes away, replace the original VSA modulator-control unit. If the DTC is still present, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).

NO -Repair an open or poor connection in the wire between the VSA modulator-control unit and the gauge control module