Honda HR-V: DTC U128D (MICU) MICU Lost Communication With Gauge Control Module

NOTE : The DTC may be stored due to the grounding failure or the power source failure at the transmitting control unit (the grounding inspection and the power source inspection on each control unit are required prior to this checking process).

DTC (MICU)

NOTE : 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.

1. Problem verification:

1. Clear the DTCs with the HDS.

Clear DTCs

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.

Is DTC U128D indicated?

YES

Go to step 2.

NO

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

2. Open wire check (B-CAN_H, B-CAN_L line):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the receiving control unit connector.

Under-dash fuse/relay box connector D (24P)

3. Disconnect the transmitting control unit connector.

Gauge control module connector A (32P)

4. Check for continuity between the receiving control unit and the transmitting control unit on the B-CAN_H circuit and the B-CAN_L circuit as specified in the table while in the vehicle OFF (LOCK) mode.

Is there continuity?

YES

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

NO

Repair an open or high resistance in the B-CAN_H and/or B-CAN_L wire(s) between the receiving control unit and the transmitting control unit.

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

1. Reconnect all connectors.
2. Turn the vehicle to the ON mode.
3. Clear the DTCs with the HDS.

Clear DTCs

4. Check the DTCs with the HDS.

Is U128D indicated?

YES

Check for loose terminals and poor connections in the under-dash fuse/relay box connectors. Check is OK, replace the under-dash fuse/relay box.

NO

The under-dash fuse/relay box is OK at this time. Replace the gauge control module.

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