Recently, vehicular visible light communication (V2LC) is proposed as a solution to increase road safety and realize autonomous driving. The system performance for the outdoor V2LC system is investigated. In the system, the main distortion is caused by ambient-induced shot noise and thermal noise. With path loss and atmosphere turbulence, a statistical channel model is established for outdoor V2LC. Based on the channel model, the probability density function of the composite channel gain is derived. Moreover, the theoretical expressions of the outage probability and the bit error rate are derived, respectively. Numerical results show that the derived theoretical expressions are very accurate and can evaluate the system performance without time-intensive simulations.