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In Homogeneous Charge Compression Ignition (HCCI) as well as in conventional Diesel engine, fuel oxidation chemistry determines the ignition timing and the subsequent heat release. Auto-ignition is characterized by the production of large active intermediate radicals during the initial stage of oxidation. This makes the modeling task more complex, as it demands high computing resources to solve several hundreds of species transport equations involved in the detailed chemical mechanism. Therefore, introduction of complex chemistry details into a CFD code in a simple way is necessary. A new 3D auto-ignition model Tabulated Kinetics for Ignition with Probability Density Function (TKI-PDF) is presented. The objective is to include detailed chemical kinetics and the turbulence/chemistry interactions during auto-ignition. The model development and the validation against experiments are described in two stages.