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 U0128: Gauge Control Module Lost Communication With Electric Parking Brake Control Unit (V6, Gauge Control Module without CAN gateway)
| DTC Description | DTC |
|---|---|
| U0128 Gauge Control Module Lost Communication With Electric Parking Brake Control Unit |
DTC (Gauge Control Module)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information - Refer to: Network Communications System Description (2015-17) or Network Communications System Description (With SH-AWD) (2015-17) or Network Communications System Description (2018-19) .
- 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 U0128 Gauge Control Module Lost Communication With Electric Parking Brake Control Unit Is DTC U0128 indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
- Fuse check
-1. Check the following fuse.
Fuse No. B7 (7.5 A) Location Under-dash fuse/relay box Is the fuse OK?
YES
Go to step 3.
NO
Replace the fuse. If the fuse blows again, repair a short to ground in the No. B7 (7.5 A) fuse circuit.
- Open wire check (IG1 OPTION line)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Electric parking brake control unit 30P connector - 3. Turn the vehicle to the ON mode.
- 4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Electric parking brake control unit 30P connector: disconnected
Test point 1 Electric parking brake control unit 30P connector No. 24 - Refer to: Electric Parking Brake Control Unit Connector for Inputs and Outputs (2015-17) or Electric Parking Brake Control Unit Connector for Inputs and Outputs (2018-19) Test point 2 Body ground Is there battery voltage?
YES
The IG1 OPTION wire is OK. Go to step 4.
NO
Repair an open or high resistance in the wire.
- Open wire check (GND lines)
-1. Turn the vehicle to the OFF (LOCK) mode
- 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Electric parking brake control unit 30P connector: disconnected
Test point 1 Electric parking brake control unit 30P connector No. 5 - Refer to: Electric Parking Brake Control Unit Connector for Inputs and Outputs (2015-17) or Electric Parking Brake Control Unit Connector for Inputs and Outputs (2018-19) Test point 2 Body ground Test point 1 Electric parking brake control unit 30P connector No. 7 - Refer to: Electric Parking Brake Control Unit Connector for Inputs and Outputs (2015-17) or Electric Parking Brake Control Unit Connector for Inputs and Outputs (2018-19) Test point 2 Body ground Is there continuity?
YES
The GND wires are OK. Go to step 5.
NO
Repair an open or high resistance in the ground wire or poor ground (G403).
- Open wire check (F-CAN A lines)
-1. Connect terminals A and B with a jumper wire.
Terminal A Electric parking brake control unit 30P connector No. 29 - Refer to: Electric Parking Brake Control Unit Connector for Inputs and Outputs (2015-17) or Electric Parking Brake Control Unit Connector for Inputs and Outputs (2018-19) Terminal B Electric parking brake control unit 30P connector No. 30 - Refer to: Electric Parking Brake Control Unit Connector for Inputs and Outputs (2015-17) or Electric Parking Brake Control Unit Connector for Inputs and Outputs (2018-19) - 2. Disconnect the following connector.
Gauge control module 32P connector - 3. Check for continuity between test points 1 and 2 respectively.
Test condition Vehicle OFF (LOCK) mode Electric parking brake control unit 30P connector: disconnected
Gauge control module 32P connector: disconnected
Test point 1 Gauge control module 32P connector No. 27 - Refer to: Gauge Control Module Input Test (2015-17), or Gauge Control Module Input Test (2018-19) Test point 2 Gauge control module 32P connector No. 28 - Refer to: Gauge Control Module Input Test (2015-17), or Gauge Control Module Input Test (2018-19) Is there continuity?
YES
The F-CAN A wires are OK. Replace the gauge control module .
NO
An open or poor connection in the F-CAN A wires between the electric parking brake control unit and the gauge control module.
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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.
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