Troubleshooting Troubleshooting – Automatic Transmission – 2.5L NA Estimated reading: 1 minute Contributors Overview This troubleshooting guide is designed to help diagnose and resolve automatic transmission issues specific to the Porsche 944 S2 (3.0L, 1989–1991). It addresses common symptoms such as slipping, erratic shifts, delayed upshifts, or failure to move in forward or reverse, as well as issues with downshifting when the accelerator is fully depressed. Proper diagnosis and maintenance are critical to ensure the longevity and performance of the S2’s automatic transmission. Transmission Slips, Shifts Are Erratic, Upshifts Take Too Long, or Car Will Not Move in Forward or Reverse Possible Causes Checks Procedure ATF Level Low Check level in transaxle reservoir and add fluid as necessary. N/A Stuck main pressure control valve Remove and clean valve. N/A Transaxle Internal Problems Remove transaxle and have professionally rebuilt. N/A Transmission Will Not Downshift with Accelerator Pedal Fully Depressed Possible Causes Checks Procedure Transaxle throttle cable out of adjustment Adjust cable. N/A Sources Clark’s Garage Pelican Parts Porsche 944 Workshop Manuals YouTube Tagged:Automatic Transmission Troubleshooting – Automatic Transmission – 2.5L NA - PreviousTroubleshootingNext - Troubleshooting – Automatic Transmission – 2.5L NATroubleshooting – Brakes – 2.5L NA
