03 Explorer no reverse

[dantzknox]

I have an 03 Explorer 2WD with a 5R55S transmission. I lost reverse a couple of weeks ago. All other gears work fine and there are no warning lights or error codes coming on. Is there possibly a simple fix to this problem or am I looking at a R&R??
Thanks

 

[blacksnapon]

possible causes

Powertrain Control System
PCM, vehicle wiring harnesses, Pressure Control Solenoid C (PC C), Shift Solenoid B (SSB)
Carry out on-board diagnostic tests. Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for diagnosis and testing of the PCM.

GO to Pinpoint Test A and GO to Pinpoint Test D.

Repair as required. Clear DTCs, road test and rerun on-board diagnostic test.

Main Control
Screws not tightened to specification
Tighten to specification.

Separator plate damaged
Inspect for damage. If damaged, install a new separator plate.

Contamination
Disassemble and clean.

Valves, springs damaged, misassembled, missing, stuck, or bore damage
If damaged or parts are missing, install a new main control assembly. If misassembled, reassemble correctly. DO NOT stone, file or sand valves. This will remove the anodized finish and may result in further main control or transmission damage.

Filter damaged or missing
Inspect for damage. Repair as necessary.

Direct Clutch Assembly
Seals, piston damaged
Inspect or damage. Repair as necessary.

Check ball damaged, missing, not seating, off location
Inspect for mislocation, poor seating, damage. Install a new cylinder.

Friction elements damaged or worn
Inspect for damage. Repair as necessary.

Return springs damaged
Inspect for damage. Repair as necessary.

Reverse Servo
Servo retaining screws damaged
Inspect for damage. Repair as necessary.

Seals (piston and cover) damaged
Inspect for damage. Repair as necessary.

Reverse Band
Band damaged
Inspect for damage. Repair as necessary.

Servo worn or damaged
Inspect for damage. Repair as necessary.

Reverse Drum Assembly
One-way clutch damaged
Inspect for damage. Install a new drum assembly.

Bearing damaged
Inspect for damage. Install a new drum assembly.

Torque Converter
Internal component damage
Remove transmission. Inspect for damage. Carry out Torque Converter checks, refer to Torque Converter Diagnosis in this section. If the torque converter fails to pass the checks or is damaged, install a new or remanufactured torque converter.

 

[dantzknox]

Ok so it looks like you've listed everything that could go wrong with an automatic transmission. Are these possible causes listed in the order of 'most likely cause' to 'least likley cause'?

 

[blacksnapon]

First choices would be, solenoids, servos, then valve body. Everything else requires disassembly.