Lost Communication With Park Brake Control Module
What it means
U0128 means another module has stopped receiving messages from the park brake control module — the unit that operates the electronic parking brake. The vehicle still drives, but the EPB may not apply or release on command and can be stuck engaged or disengaged, which is a safety concern. It usually traces to wiring, connector, power/ground, or bus faults at the module, or a failed module.
Can I keep driving? Usually yes — the engine runs and the vehicle drives, but the electronic parking brake may not apply or release on demand, and could be stuck engaged or disengaged; treat that as a safety concern.
Common symptoms
What you'll notice
- Electronic parking brake (EPB) warning light or 'service park brake' message
- Parking brake won't apply or release electronically, or is stuck in one state
- Auto-hold or hill-hold features disabled
- Other modules logging lost-communication codes for the park brake module
Common causes
Most likely first
- Wiring or connector fault at the park brake control module (opens, corrosion, damage)Likely
- Loss of power or ground to the moduleCommon
- CAN bus wiring fault on the branch feeding the moduleCommon
- Water intrusion at the module or connector (often mounted low/rear)Less often
- Failed park brake control moduleLess often
How to diagnose & fix
Work through it in order
- Scan all modules to confirm the park brake module is the one offline.
- Check power and ground at the module connector with the key on.
- Inspect the module wiring and connector for corrosion, damage, or moisture.
- Test CAN bus continuity between the module and the network.
- If wiring and supply are good, the module is likely failed — replace and program as needed, then re-test.
FAQ
Quick answers
Is it safe to drive with U0128?+
Can I just clear U0128?+
Related codes
Often seen with U0128
Read & clear U0128 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.