18-050-16 REV. A

"FLASH: POWERTRAIN DIAGNOSTIC AND SYSTEM IMPROVEMENTS THIS BULLETIN INVOLVES SELECTIVELY ERASING AND REPROGRAMMING THE POWERTRAIN CONTROL MODULE (PCM) WITH NEW SOFTWARE. SYMPTOM/CONDITION: A SMALL NUMBER OF CUSTOMERS MAY EXPERIENCE A MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATION. UPON FURTHER INVESTIGATION THE TECHNICIAN MAY FIND ONE OR MORE OF THE FOLLOWING DIAGNOSTIC TROUBLE CODES (DTCS) SET IN THE PCM: JC VEHICLES 3.6L: · P0335 - CRANKSHAFT POSITION SENSOR CIRCUIT. · P2610 - PCM INTERNAL ENGINE OFF TIMER PERFORMANCE. · U0140 - LOST COMMUNICATION WITH BODY CONTROL MODULE (BCM). · P0456 - EVAP SYSTEM SMALL LEAK. · P0108 - MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT HIGH (2012 MY ONLY). THE FOLLOWING TRANSMISSION ENHANCEMENTS ARE ALSO INCLUDED IN THIS SOFTWARE UPDATE: · CONTINUOUS CYCLING OF FUEL PUMP RELAY WHEN USING REMOTE START. · 1 - 2 UPSHIFT CLUNK OR BUMP. · 3 - 4 HARSH UPSHIFT AT CLOSED THROTTLE AFTER A WOT STAB IN 1ST OR 2ND GEAR. · 4 - 5 UPSHIFT CLUNK OR BUMP. · 5 - 6 UPSHIFT CLUNK OR BUMP. · 5- 4 DOWNSHIFT CLUNK OR BUMP. · 6 - 5 DOWNSHIFT CLUNK OR BUMP. · RPM FLUCTUATING OR JERKING WHILE OPERATING IN CRUISE CONTROL. CONDITION IS MORE NOTICEABLE WHEN THE VEHICLE IS GOING UP AND DOWN GRADES. · IMPROVES THE CONSISTENCY OF HOW SHIFTS ARE CONTROLLED DURING UPSHIFTS “TORQUE MANAGEMENT”. · DELAYED DOWNSHIFTS. JC VEHICLES 2.4L: · **U0140 - LOST COMMUNICATION WITH BODY CONTROL MODULE (BCM).** · P0456 - EVAP SYSTEM SMALL LEAK. THE FOLLOWING TRANSMISSION ENHANCEMENTS ARE ALSO INCLUDED IN THIS SOFTWARE UPDATE: · 1 - 2 UPSHIFT CLUNK OR BUMP. · 3 - 4 HARSH UPSHIFT AT CLOSED THROTTLE AFTER A WOT STAB IN 1ST OR 2ND GEAR. · 4 - 5 UPSHIFT CLUNK OR BUMP. · RPM FLUCTUATING OR JERKING WHILE OPERATING IN CRUISE CONTROL. CONDITION IS MORE NOTICEABLE WHEN THE VEHICLE IS GOING UP AND DOWN GRADES. · 1 - 2 HARSH UPSHIFT GOING DOWN A GRADE. · 3 - 2 DOWNSHIFT CLUNK OR BUMP. · 4 - 3 DOWNSHIFT CLUNK OR BUMP.