NHTSA Complaint #10536142 — 2010 MITSUBISHI LANCER EVOLUTION

ON-DASH WARNING LIGHT OF "4WD SYSTEM SERVICE REQUIRED" CAME ON. THIS WARNING IS INDICATIVE OF A ACTIVE CENTER DIFFERENTIAL (ACD) PUMP FAILURE, GENERALLY DUE TO CORROSION FROM TREATED WINTER ROAD SURFACES AND/OR THE INABILITY TO HANDLE COLD-WEATHER CLIMATES. CAR WAS PREVIOUSLY SERVICED UNDER A TECHNICAL SERVICE BULLETIN (TSB) TO DELAY ACTIVATION OF THE ACD PUMP FOR THIS EXACT REASON 2 YEARS PRIOR TO FAILURE. MITSUBISHI HAS YET TO CORRECT THIS MANUFACTURING DEFECT AND IS CURRENTLY REFUSING TO HONOR WARRANTY SERVICE OF FAILED PUMPS UNDER THEIR 5-YEAR / 36,000-MILE POWERTRAIN WARRANTY, STATING THAT THE PUMP IS NOT REQUIRED FOR THE VEHICLE TO OPERATE SAFELY AND PROPERLY. IN CONTRAST, A WORKING ACD PUMP DIRECTLY EFFECTS THE VEHICLE'S HANDLING, TRACTION & STEERING - AND ALL 3 DRIVING PARAMETERS IMMEDIATELY BEHAVE DIFFERENTLY WHEN THE PUMP SHUTS DOWN IN SELF-PROTECTION MODE OR HAS FAILED COMPLETELY. THIS VEHICLE HAS A DRIVER-SELECTED SETTING FOR TARMAC (PAVEMENT), GRAVEL/RAIN & SNOW CONDITIONS - THESE SETTINGS ARE COMPLETELY DISABLED WHEN THE ACD PUMP HAS FAILED, OR IS FAILING (ON-DASH WARNING WITH PUMP IN SELF-PROTECTION MODE). THIS ISSUE EFFECTS SEVERAL MODELS (LANCER, LANCER EVOLUTION, RALLIART, ETC.) FROM MODEL YEAR 2008 TO 2014, AND HUNDREDS OF INSTANCES OF THIS ISSUE HAVE BEEN DOCUMENTED IN ONLINE FORUMS (AND PROBABLY SEVERAL-FOLD THAT AMOUNT THAT HAVEN'T BEEN DISCUSSED ONLINE). PLEASE LOOK INTO THIS ISSUE IMMEDIATELY, THANK YOU. *TR