OBD2 code U0011: Medium Speed CAN Communication Bus Performance
The medium-speed CAN bus is operating but with degraded performance — frame errors or excessive error counters.
Detected Root Component
Network Component
Observed Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Possible Causes
- Corrosion in body harness connectors
- One module sending malformed frames
- Gateway module routing CAN messages incorrectly
Tools Required
Interactive Diagnostic
Answer each question to calculate your diagnostic score.
No steps available.
Diagnostic Result
Score threshold guide
Was this diagnostic helpful?
Parts likely to be the cause (Moteur (général))
Moteur (général)
Photo d'illustration : Moteur (général)
© DTC-Logic.com
Click on an image to enlarge
Frequently asked questions about code U0011
What does code U0011 mean? ▾
OBD2 code U0011: Medium Speed CAN Communication Bus Performance. The medium-speed CAN bus is operating but with degraded performance — frame errors or excessive error counters.
What are the symptoms of code U0011? ▾
Code U0011 may cause: Multiple warning lights may illuminate, Affected modules may go into limp mode or shut down, Specific functions inoperative depending on module, Diagnostic tools may show communication faults. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code U0011? ▾
The most common causes of code U0011 are: Corrosion in body harness connectors, One module sending malformed frames, Gateway module routing CAN messages incorrectly. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code U0011? ▾
Yes, code U0011 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code U0011? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Corrosion in body harness connectors, One module sending malformed frames, Gateway module routing CAN messages incorrectly. Difficulty: Medium · Estimated time: 30-60min.