OBD2 code U0049: CAN communication bus - Network fault – symptoms, causes & step-by-step diagno
U0049: CAN bus communication fault Common symptoms: Loss of communication between modules, Dashboard errors. Inspect Damaged CAN wiring and related wiring.
Detected Root Component
Network Component
Observed Symptoms
- Loss of communication between modules
- Dashboard errors
- Unresponsive module
Possible Causes
- Damaged CAN wiring
- Missing CAN termination resistor
- CAN bus short circuit module
- Damaged wiring
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 U0049
What does code U0049 mean? ▾
OBD2 code U0049: CAN communication bus - Network fault – symptoms, causes & step-by-step diagno. U0049: CAN bus communication fault Common symptoms: Loss of communication between modules, Dashboard errors. Inspect Damaged CAN wiring and related wiring.
What are the symptoms of code U0049? ▾
Code U0049 may cause: Loss of communication between modules, Dashboard errors, Unresponsive module. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code U0049? ▾
The most common causes of code U0049 are: Damaged CAN wiring, Missing CAN termination resistor, CAN bus short circuit module, Damaged wiring. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code U0049? ▾
Yes, code U0049 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code U0049? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Damaged CAN wiring, Missing CAN termination resistor, CAN bus short circuit module, Damaged wiring. Difficulty: Medium · Estimated time: 30-60min.