Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
CAN-Bus Operation: Notes
The primary function of the CAN-Bus is to exchange data at a high transfer rate between CAN subscribers. This is accomplished using two signal lines referred to as CAN-High and CAN-Low. Both of these signal lines transfer the same data at the same time. Two signal lines are used for redundancy in the event of a signal line failure.
Voltage on the CAN-Bus is divided between the two data lines. for an average of 2.5 volts per line. Voltage is measured from each data line to ground. Each module on CAN contributes to this voltage.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.