hello everyone glade to be here. I NEED some help my 1998 sl1 automatic transmission seems the TCC stuck on/off? a few weeks ago coming home my transmission went into a safe mode only able to be in low gear. code read TCC stuck on/off. i changed fluid an filter also changed transmission temp switch with a brass one. i can clear codes start car drives so far then drop into the safe mode again. now my code read gear 2 not right ratio, gear 3 not right ratio, gear 4 not right ratio. I put 6 quarts of recommended fluid but sounds like cavitation in the transaxle.

 

Please post the actual code number for the first time it coded and the code numbers for the second time.

I'll try to help you sort it out.

For starters, are you sure you did not disturb any electrical connections when working on the trans? Possibly a sensor pigtail?

 

Does it even hold 6 quarts of fluid with just a fluid and filter change? For some reason, I thought it was 4 to 4.5. Been a while since I owned one and did the fluid and filter change and I MIGHT be thinking of my PT Cruiser.

 

1st set of codes when problem started P0740 Torque converter clutch circuit open, P0750 shift solenoid A, P0755 shift solenoid B, P0760 shift solenoid C, P0765 shift solenoid D, P0770 shift solenoid E

2nd set of codes after repairs P0731 gear 1 incorrect ratio, P0733 gear 3 incorrect ratio, P0734 incorrect ratio

 

P0740 Torque converter clutch malfunction

• Low transmission fluid level
• Dirty transmission fluid
• Faulty torque converter clutch solenoid valve
• Torque converter clutch solenoid valve harness is open or shorted
• Torque converter clutch solenoid valve circuit poor electrical connection

P0750 - Shift Solenoid 'A' Malfunction

• Low transmission fluid level
• Dirty transmission fluid
• Faulty shift solenoid 'A' valve
• Shift solenoid 'A' valve harness or connectors
• Shift solenoid 'A' valve circuit is open or shorted

P0755 - Shift Solenoid 'B' Malfunction

• Low transmission fluid level
• Dirty transmission fluid
• Faulty shift solenoid 'B' valve
• Shift solenoid 'B' valve harness is open or shorted
• Shift solenoid 'B' valve circuit poor electrical connection

P0760 - Shift Solenoid 'C' Malfunction

• Low transmission fluid level
• Dirty transmission fluid
• Faulty shift solenoid 'C' valve
• Shift solenoid 'C' valve harness or connectors
• Shift solenoid 'C' valve circuit is open or shorted

P0765 "Shift Solenoid D Malfunction".

• Low transmission fluid level
• Dirty transmission fluid
• Faulty shift solenoid 'D' valve
• Shift solenoid 'D' valve harness or connectors
• Shift solenoid 'D' valve circuit is open or shorted

P0770 - Shift Solenoid 'E' Malfunction

• Low transmission fluid level
• Dirty transmission fluid
• Faulty shift solenoid 'E' valve
• Shift solenoid 'E' valve harness is open or shorted
• Shift solenoid 'E' valve circuit poor electrical connection

P0731 SATURN Code - Gear 1 Incorrect Ratio

• Low transmission fluid level
• Dirty transmission fluid
• Shift solenoids
• Transmission mechanical problems
• Transmission hydraulic control circuit

P0733 SATURN - Gear 3 Incorrect Ratio

• Low transmission fluid level
• Dirty transmission fluid
• Shift solenoids
• Transmission mechanical problems
• Transmission hydraulic control circuit

P0734 SATURN - Gear 4 Incorrect Ratio

• Low transmission fluid level
• Dirty transmission fluid
• Shift solenoids
• Transmission mechanical problems
• Transmission hydraulic control circuit

 

First group of codes sounds like there may have been electrical connectivity issues as every single solenoid including the TCC threw errors.

That seems to have been resolved during a drain and fill of the tranny. Can't say how.

To troubleshoot the incorrect gear ratio errors, I would check the input and output speed sensors on the transmission.