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 U128D
DTC U128D : Lost Communication with Meter on B-CAN
| DTC Description | DTC |
|---|---|
| U128D Lost Communication with Meter on B-CAN |
DTC (Telematics System)
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
- Check the connectors for poor connections or loose terminals.
- Problem verification
-1. Clear the DTCs with the HDS.
-2. Press the engine start/stop button to select the OFF mode and then select the ON mode.
-3. Wait for at least 6 seconds.
-4. Check for DTCs with the HDS.
DTC Description DTC U128D Lost Communication with Meter on B-CAN Is DTC U128D indicated?
YES
The failure is duplicated, go to step 2.
NO
Intermittent failure, the system is OK at this time.
- Open wire check (B-CAN_H line, B-CAN_L line)
-1. Press the engine start/stop button to select the OFF mode.
-2. Disconnect the following connectors.
Telematics control unit connector A (36P) Gauge control module 32P connector -3. Check for continuity between test points 1 and 2.
Test condition OFF mode Telematics control unit connector A (36P): disconnected Gauge control module 32P connector: disconnected Test circuit B-CAN_H Test point 1 Telematics control unit connector A (36P) No. 33 (PNK) Test point 2 Gauge control module 32P connector No. 25 (PNK) Test circuit B-CAN_L Test point 1 Telematics control unit connector A (36P) No. 34 (BLU) Test point 2 Gauge control module 32P connector No. 26 (BLU) Is there continuity?
YES
Replace the gauge control module .
NO
Repair an open in the wire(s) between the telematics control unit and the gauge control module.
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.