U0128Network Communication

Lost Communication With Park Brake Control Module

U0128 means a module has lost communication with the park brake control module over the CAN bus. On electronic parking brakes this can lock or disable the brake. It usually points to a wiring, power, ground, or connector fault.

🚗 Not recommended. On electronic park brake systems, this can prevent releasing or applying the brake.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Wiring, connector, or CAN bus fault$50-$500

45%

Damaged or corroded wiring to the park brake module.

#2Power or ground fault$50-$400

30%

Blown fuse or poor ground at the module.

#3Failed park brake control module$300-$1000

15%

The module itself has failed.

🩺 Common Symptoms

Park brake warning message
Cannot release or apply park brake
ABS warning light
Warning lights
Other U-codes stored

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$150-$900

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose U0128

1Check fuses, power, and grounds for the park brake module

2Inspect CAN wiring and connectors at the module

3Scan all modules for lost-communication patterns

4Back-probe the CAN bus for correct signal

❓ Frequently Asked Questions

Can I drive with U0128?

Not safely on electronic park brake systems, where the brake may not release. Diagnose it first.

What causes U0128?

Wiring, connector, or power/ground faults at the park brake control module, most often.

Why is my electronic park brake stuck with U0128?

If the module cannot communicate, the brake may fail to release until the fault is fixed.

🔗 Related Codes

U0100U0121U0122U0126