Lost Communication With Brake-By-Wire Module
The U0298 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Brake-By-Wire Module. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $800 - $4,000 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Brake system fault critical warning
- Reduced braking force
- Brake pedal feel completely changed
- Emergency braking mode activated
- Multiple brake system warnings
Probable Causes (Ranked by Likelihood)
- Failed brake-by-wire controller Very High
- Brake actuator motor failure High
- CAN bus backbone disruption Moderate
- Hydraulic backup system activated Low
Step-by-Step Diagnostic Procedure
-
Scan brake-by-wire module for codes
-
Test brake actuator response
-
Check hydraulic backup operation
-
Verify CAN bus backbone
Frequently Asked Questions
Can I drive with U0298?
No. Brake-by-wire failure is a critical safety issue. A hydraulic backup may provide limited braking.
What causes U0298?
Usually a failed brake controller or actuator. Redundant systems should provide some braking.
Is brake-by-wire safe?
Yes, with multiple redundancies. Complete failure activates hydraulic backup systems.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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