U0126High Severity
Network Communication Loss (Bus 0126)
This diagnostic trouble code indicates a malfunction in the associated component circuit.
Common Symptoms of U0126
- Multiple warning lights
- No communication with scanner
What Causes the U0126 Code?
- CAN Data Bus short
- Dead module bringing down the network
How serious is the U0126 code?
Because this code has a high severity level, it is highly recommended to address it promptly. Driving with an active U0126 fault can lead to secondary component failures and decreased fuel economy.
How do you definitively diagnose and fix U0126?
To accurately diagnose the U0126 fault code, you need the exact OEM wiring diagram and diagnostic test procedures for your specific vehicle. Create an Auto Fix Data account to instantly pull the factory diagrams for this fault.
Fix U0126 Now
Access the OEM repair manual and interactive wiring diagram to diagnose this exact code.
- Pin-to-pin wiring diagrams
- Component testing steps
- Technical Service Bulletins
- Identifix confirmed fixes
Related Fault Codes
P0001
Fuel and Air Metering System Malfunction (Circuit 0001)
P0002
Fuel and Air Metering System Malfunction (Circuit 0002)
P0003
Fuel and Air Metering System Malfunction (Circuit 0003)
P0004
Fuel and Air Metering System Malfunction (Circuit 0004)
P0005
Fuel and Air Metering System Malfunction (Circuit 0005)
P0006
Fuel and Air Metering System Malfunction (Circuit 0006)