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.
DTC C1807-08: Sub CAN Bus OFF: General Description
The Controller Area Network (CAN) high speed bus is used where data needs to be exchanged between modules at a high rate, to minimize the delay between the occurrence of a change in sensor value and the reception of this information by a control device using the information to adjust vehicle system performance. The CAN network consists of two twisted wires: one signal circuit is identified as CAN-high and the other signal circuit is identified as CAN-low. At each end of the data bus there is a 120Ξ© termination resistor between the CAN-high and CAN-low circuits. When the CAN-high signal circuit is driven higher, to about 3.5V, and the CAN-low circuit is driven lower, to about 1.5V, the differential voltage becomes approximately 2.0 (Β±0.5) V.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.