CHEVY SILVERADO. GMC SIERRA. CHEVY EXPRESS VAN OEM ECU ENGINE CONTROL MODULE. HAS ONE PART NUMBER ON ACTUAL ECU. DIFFERENT ON THE BOX IT CAME WITH. PLEASE CHECK PART NUMBERS MAKE SURE IT WILL WORK FOR YOUR VEHICLE. ? USED WORKING MODULE ? PLEASE TAKE A MOMENT AND LOOK AT PICTURES ? YOU WILL RECEIVE ITEM YOU SEE ON THE PICTURES ? ? RETURN POLICY : RETURNS ONLY IF I MADE MISTAKE IN LISTING, OR IF LISTING NOT AS DESCRIBED. BUYER IS RESPONSIBLE FOR FITMENT. PLEASE LOOK AT THE PHOTOS AND PART # TO MAKE SURE IT'S CORRECT PART ? SHIPPING: ADDITIONAL $20 CHARGE FOR HAWAII, PUERTO RICO, AND ALASKA. ? IMPORTANT: BEFORE LEAVING NEGATIVE FEEDBACK, PLEASE CONTACT ME FIRST, I WILL DO MY BEST TO RESOLVE ANY ISSUES.