Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC U1281, U1288, U128F(Gauge Control Module) (2024 2025)
DTC U128F : Gauge control module lost communication with BSI unit
NOTE:
- Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table below.
- 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 Description | DTC |
|---|---|
| U1281 Gauge control module lost communication with MICU (MICU frame) | |
| U1288 Gauge control module lost communication with PARKSR | |
| 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: BODY ELECTRICAL TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A - INITIAL COMMUNICATION AND DTC CHECKS (2021 2022 2023 2024 2025) .
- 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 U1281 Gauge control module lost communication with MICU (MICU frame) U1288 Gauge control module lost communication with PARKSR U128F Gauge control module lost communication with BSI unit Are any DTCs indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time, Check for loose or poor connections.
- Open wire check (B-CAN_H, B-CAN_L lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the receiving control unit connector.
Gauge control module 32P connector
-3. Disconnect the transmitting control unit connectors.
Under-dash fuse/relay box connector M (12P)
Parking and back-up sensor control unit 16P connector
Left side BSI radar unit 6P connector
-4. Measure the resistance 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.
DTC CIRCUIT NAME RECEIVING CONTROL UNIT TRANSMITTING CONTROL UNIT U1281 B-CAN_H Gauge control module 32P connector No. 30 - Refer to: GAUGE CONTROL MODULE CONNECTOR FOR INPUTS AND OUTPUTS (2020 2021 2022 2023 2024 2025) Under-dash fuse/relay box connector M (12P) No. 7 - Refer to: UNDER-DASH FUSE/RELAY BOX CONNECTOR FOR INPUTS AND OUTPUTS B-CAN_L Gauge control module 32P connector No. 31 - Refer to: GAUGE CONTROL MODULE CONNECTOR FOR INPUTS AND OUTPUTS (2020 2021 2022 2023 2024 2025) Under-dash fuse/relay box connector M (12P) No. 1 - Refer to: UNDER-DASH FUSE/RELAY BOX CONNECTOR FOR INPUTS AND OUTPUTS U1288 B-CAN_H Gauge control module 32P connector No. 30 - Refer to: GAUGE CONTROL MODULE CONNECTOR FOR INPUTS AND OUTPUTS (2020 2021 2022 2023 2024 2025) Parking and back-up sensor control unit 16P connector No. 9 B-CAN_L Gauge control module 32P connector No. 31 - Refer to: GAUGE CONTROL MODULE CONNECTOR FOR INPUTS AND OUTPUTS (2020 2021 2022 2023 2024 2025) Parking and back-up sensor control unit 16P connector No. 2 U128F B-CAN_H Gauge control module 32P connector No. 30 - Refer to: GAUGE CONTROL MODULE CONNECTOR FOR INPUTS AND OUTPUTS (2020 2021 2022 2023 2024 2025) Left side BSI radar unit 6P connector No. 3 - Refer to: BSI RADAR UNIT CONNECTOR FOR INPUTS AND OUTPUTS B-CAN_L Gauge control module 32P connector No. 31 - Refer to: GAUGE CONTROL MODULE CONNECTOR FOR INPUTS AND OUTPUTS (2020 2021 2022 2023 2024 2025) Left side BSI radar unit 6P connector No. 5 - Refer to: BSI RADAR UNIT CONNECTOR FOR INPUTS AND OUTPUTS Is there 1.0 Ohm or less?
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 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 U1281 Gauge control module lost communication with MICU (MICU frame) U1288 Gauge control module lost communication with PARKSR U128F Gauge control module lost communication with BSI unit Are any DTCs indicated?
YES
Check for loose terminals and poor connections in the gauge control module connector. Check is OK, GAUGE CONTROL MODULE REMOVAL AND INSTALLATION .
NO
The gauge control module is OK at this time. Replace the transmitting control unit. (Refer to the DTC code shown on the display, and then replace the control unit based on the instructions in the table below.)
DTC TRANSMITTING CONTROL UNIT U1281 Replace the MICUUNDER-DASH FUSE/RELAY BOX REMOVAL AND INSTALLATION (EXCEPT KC) U1288 PARKING AND BACK-UP SENSOR CONTROL UNIT REMOVAL AND INSTALLATION U128F BSI RADAR UNIT REMOVAL AND INSTALLATION
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.