What Does U0128 Mean?
The vehicle's controller area network has lost communication with the Electronic Park Brake (EPB) control module. This network fault prevents the EPB system from receiving or sending data to other vehicle systems.
Common Causes
35%
Failed park brake control module
30%
Damaged wiring harness or corroded connectors to EPB module
20%
CAN bus communication circuit fault
10%
Loss of power or ground to park brake module
5%
Module software failure requiring reprogramming
Diagnostic Steps
1
Step 1: Verify park brake control module has battery voltage and solid ground connections
2
Step 2: Inspect module connector for corrosion, damage, or loose fit
3
Step 3: Check CAN bus signals at module connector using oscilloscope or multimeter
4
Step 4: Attempt to access EPB module through scan tool bidirectional controls to verify functionality
5
Step 5: Check for technical service bulletins related to EPB module communication issues
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The vehicle's controller area network has lost communication with the Electronic Park Brake (EPB) control module. This network fault prevents the EPB system from receiving or sending data to other vehicle systems.
The most common cause of U0128 (Lost Communication With Park Brake Control Module) is: Failed park brake control module
Typical repair costs for U0128 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Electronic park brake may not function properly, potentially preventing proper parking brake operation. Manually engage park brake if equipped with backup method and avoid parking on steep inclines.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0128 to identify the root cause.
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Quick Info
Category
Network
System
Electronic Park Brake System / CAN Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
