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Harsh 6-5 Coast Downshift in Tow/Haul Mode

WARNING: This page is about a different car, the 2011 Ford F550 Super Duty and 2011 Ford F450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC ROUTINES - HARSH 6-5 COAST DOWNSHIFT IN TOW/HAUL MODE

Possible Component Reference/Action
246 - ROUTINE 
Powertrain Control System 
  • CARRY OUT On-Board Diagnostic (OBD) tests. REFER to the INTRODUCTION article for diagnosis and testing of the PCM. For diagnosing SSPCA  , SSPCB  and TCC  solenoid, GO to PINPOINT TEST A . REPAIR as necessary. CLEAR the DTCs, ROAD TEST the vehicle and RERUN the OBD  test.
  • PCM, vehicle wiring harnesses, transmission internal harness, Shift Solenoid Pressure Control A (SSPCA), Shift Solenoid Pressure Control B (SSPCB), Torque Converter Clutch (TCC) solenoid
Transmission Fluid 
  • CARRY OUT the Transmission Fluid Condition Check. REFER to PRELIMINARY INSPECTION  in this service information.
  • Condition
Incorrect Line Pressures 
  • CHECK pressure at line tap. CARRY OUT Line Pressure Test. REFER to SPECIAL TESTING PROCEDURES  in this service information. FOLLOW the pressure diagnosis test as required.
  • High pressures
Solenoid Body Assembly 
  • Bolts not tightened to specification
  • TIGHTEN to specification.
  • Filter gasket damaged
  • INSTALL a new filter gasket.
  • Contamination
  • DISASSEMBLE and CLEAN.
  • If damaged or parts are missing, INSTALL a new solenoid body assembly. If misassembled, reassemble correctly.
  • SSPCA  , SSPCB  , TCC  solenoid(s) damaged, stuck or bore damaged; manual valve damaged, stuck or bore damaged
Coast Clutch Assembly 
  • Seals, piston damaged
  • REPAIR as necessary.
  • Friction elements damaged or worn
  • REPAIR as necessary.
  • REPAIR as necessary.
  • Return springs damaged
Overdrive Clutch Assembly 
  • Seals, piston damaged
  • REPAIR as necessary.
  • Filtered orifice damaged, missing, not seating, off location
  • INSPECT for mislocation, poor seating, damage. INSTALL a new pump if damaged.
  • Friction elements damaged or worn
  • REPAIR as necessary.
  • Return springs damaged
  • REPAIR as necessary.
  • REPAIR as necessary.
  • Snap ring for One-Way Clutch (OWC) and/or return spring not seated or damaged
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