No Fourth Gear - D4 (from the service manual)
Checks Cause
Fourth Clutch Components- Seals (527) (531) Nicked or cut
- Bolt (26) Loose, broken, or missing
- Spring Assembly (532) Jammed
- Retainer Ring (523) Not seated
- Friction Plates (525) Worn or burned
- Reaction Plates (526) Worn splices
- Housing (529) Damaged or cracked
Overrun Clutch Components- Reaction Plates (508) Worn splines
- 1-2 Solenoid (313) Stuck Off, Pinched wire, O-ring failure, No voltage to the solenoid
- PCM No signal to the solenoid, Failed
- 3-4 Shift Valve (308) Stuck
Check the PCM for current DTCs.