Blind Spot Detection Module Communication Bus Off
The U0599 code means the vehicle's onboard diagnostic system has detected: Blind Spot Detection Module Communication Bus Off. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $200 - $800
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
- Blind spot warning light always on or off
- Side mirror indicators not working
- Cross-traffic alert disabled
- Blind spot system fault message
Probable Causes (Ranked by Likelihood)
- Blind spot radar sensor failure Very High
- Rear bumper damage affecting sensor High
- Sensor wiring harness fault Moderate
- Module communication error on CAN bus Low
Step-by-Step Diagnostic Procedure
-
Inspect rear bumper area for damage near sensors
-
Test each blind spot sensor with scan tool
-
Check wiring harness at rear bumper connectors
-
Verify CAN bus communication from blind spot module
Frequently Asked Questions
Can I drive with U0599?
Check the severity. If it affects safety systems like stability control or braking, limit driving to short distances. Comfort features like heaters or parking assist are safe to drive with.
What causes U0599?
Most commonly a faulty blind spot detection module or damaged wiring in the communication circuit to that module.
How much does it cost to fix U0599?
Typical repair costs range from $200 - $800 depending on whether the module or just wiring needs repair.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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