DTC U128F (Gauge Control Module) (2017 2018 2019 2020)

DTC U128F : Gauge control module lost communication with BSI unit

DTC Description	DTC
U128F Gauge control module lost communication with BSI unit

DTC (Gauge Control Module)

NOTE:

If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to:

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
U128F Gauge control module lost communication with BSI unit

Is DTC U0128F indicated?

YES

Go to step 2.

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

Open wire check (B-CAN lines)

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

- 2. Disconnect the receiving control unit connector.

Gauge control module connector A (32P)

- 3. Disconnect the transmitting control unit connectors.

Left side BSI radar unit 6P connector

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

Test condition	Vehicle OFF (LOCK) mode Gauge control module connector A (32P): disconnected Left side BSI radar unit 6P connector: disconnected

Test point 1	Gauge control module connector A (32P) (female terminals) No. 25:
Test point 2	Left side BSI radar unit 6P connector (female terminals) No. 3:

Test point 1	Gauge control module connector A (32P) (female terminals) No. 26:
Test point 2	Left side BSI radar unit 6P connector (female terminals) No. 5:

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

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

Is there continuity?

YES

The B-CAN_L to B-CAN_H wire is OK. Go to step 3.

Repair an open or high resistance in the wire (s).

Determine possible failure area (the receiving control unit or the transmitting control unit)

- 1. Reconnect all connectors.

- 2. Clear the DTCs with the HDS.

- 3. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

- 4. Wait for at least 6 seconds.

- 5. Check for DTCs with the HDS.

DTC Description	DTC
U128F Gauge control module lost communication with BSI unit

Is DTC U128F indicated?

YES

Check for loose terminals and poor connections in the receiving control unit connector. Check is OK, replace the gauge control module .

The receiving control unit is OK at this time. Replace the left side BSI radar unit - Refer to: BSI Radar Unit Removal and Installation (2016 2017 2018 2019 2020),