"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.
