OBD-II Network Error Code U0128: How to Fix It

Medium 1-3 hours High Severity Verified June 2026
Error Code
U0128
Brand
OBD-II Network
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
1-3 hours
Error code U0128 indicates your vehicle's computer has lost communication with the park brake control module. This can cause your parking brake system to malfunction and may prevent your vehicle from starting or shifting properly.
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Tools You'll Need

How to Fix Error Code U0128

  1. Turn Off Engine and Engage Safety

    Always disconnect the battery before working on electrical systems to prevent short circuits and injury.
  2. Check Park Brake Fuses

    Never replace a fuse with one of higher amperage - this can cause electrical fires.
  3. Inspect Wiring Connections

  4. Test Park Brake Control Module Power

  5. Check CAN Bus Network Integrity

  6. Scan for Additional Codes

  7. Reconnect Battery and Test

Parts You May Need

Park brake control module
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Automotive fuses
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Electrical connectors
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Automotive wire
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Park brake control module
Check Price on Amazon
Automotive fuses
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive wire
Check Price on Amazon
Park brake control module
Check Price on Amazon
Automotive fuses
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive wire
Check Price on Amazon
Park brake control module
Check Price on Amazon
Automotive fuses
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive wire
Check Price on Amazon
Park brake control module
Check Price on Amazon
Automotive fuses
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive wire
Check Price on Amazon
Park brake control module
Check Price on Amazon
Automotive fuses
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive wire
Check Price on Amazon
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When to Call a Professional

Contact a professional mechanic if you're uncomfortable working with electrical systems, if multiple modules show communication errors, or if the park brake control module needs replacement. This code can affect vehicle safety systems and requires proper diagnosis.

Frequently Asked Questions

What does U0128 error code mean?
U0128 means your vehicle's computer has lost communication with the park brake control module. This prevents the parking brake system from operating correctly and may cause starting or shifting issues.
Can I drive with U0128 error code?
You should avoid driving with this error code as it affects your parking brake system. The vehicle may not start, shift properly, or the parking brake may not engage when needed, creating a safety hazard.
How much does it cost to fix U0128?
Repair costs vary from $50-200 for wiring or fuse issues, up to $300-800 if the park brake control module needs replacement. Diagnostic fees typically range from $100-150 at most shops.
What causes U0128 communication error?
Common causes include blown fuses, damaged wiring, corroded connections, faulty park brake control module, or CAN bus network problems. Rodent damage and water intrusion are also frequent culprits.
Will U0128 cause my car to fail inspection?
Yes, U0128 will likely cause your vehicle to fail safety inspection since it affects the parking brake system. The error must be resolved before the vehicle can pass inspection in most areas.