U0099
Vehicle Communication Bus H (-) High
U0099 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus H (-) High. Common causes: open or short circuit in wiring harness, damage to communication bus connectors. Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Incorrect operation of the vehicle's electronic systems
- Loss of communication between modules
- Reduced engine performance
- Errors in other systems
Causes
- Open or short circuit in wiring harness
- Damage to communication bus connectors
- Malfunction of one of the control modules
- Grounding problems
- Electromagnetic interference
How to Fix
- Check the integrity of the communication bus wiring harness
- Inspect connectors for corrosion or damage
- Check module grounding
- Scan all modules for errors
- Replace damaged components if necessary
Related codes
Error U0099 by Vehicle Brand
FAQ
What does the U0099 code mean?
U0099 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus H (-) High
What causes a U0099 error code?
The most common causes of U0099 include: Open or short circuit in wiring harness; Damage to communication bus connectors; Malfunction of one of the control modules; Grounding problems.
How do I fix a U0099 diagnostic trouble code?
To fix U0099: Check the integrity of the communication bus wiring harness. Inspect connectors for corrosion or damage. Check module grounding. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0099?
Limited driving only, diagnose soon
How much does it cost to fix U0099?
The estimated repair cost for U0099 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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