AST Smart ECO VCM Suppression Module. The AST Smart ECO VCM module plugs inline between your computer and Engine Coolant Temperature sensor to adjust the temperature it reads. It modifies the ECT value and adjusts it slightly lower, helping to prevent ECO mode from coming on - KEEPING your car running on all 6 cylinders, improving throttle response, eliminating engine shutter and saving your spark plugs / engine from premature wear!
