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Home >> Saturn >> 1997 >> SW2 Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - Mp6 & Mp7 >> Diagnostic Testing >> DTC P0783: 4TH Gear Stuck On >> Diagnostic Procedure

Diagnostic Procedure

  1. Determine if DTCs 76, 77 or 99 are present. These flags must be eliminated first as a possible cause for DTC P0783.
  2. Check actuator operation. See ACTUATOR QUICK CHECK  under SELF-DIAGNOSTIC SYSTEM. Operation sound of all actuators should be similar.
  3. Air check 4th clutch operation. See TRANSMISSION SERVICING - A/T article in AUTOMATIC TRANS SERVICE section. Repair as needed. If clutch air checks okay, disassembly of transaxle will be necessary to inspect internal components.
  4. Cross-channel leaks may cause 4th gear to be applied all the time. If DTC P0783 is present and no reverse is possible, check for damaged seals or gaskets.
  5. If clutch applies and releases, check valve body. If clutch does not operate okay, check for defective clutch components.
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