Troubleshooting - Automatic Transmission
Symptom-driven guide to diagnosing automatic transmission slipping, erratic shifts, and kickdown problems on the Porsche 944.
Difficulty: Moderate1 min readApplies to: 944 · 944 Turbo
Introduction
This troubleshooting guide is intended to help identify and repair automatic transmission problems. Symptoms covered:
- Transmission slips, shifts are erratic, upshifts take too long, or car will not move in forward or reverse
- Transmission will not downshift with accelerator pedal fully depressed
Transmission Slips, Shifts Are Erratic, Upshifts Take Too Long, or Car Will Not Move in Forward or Reverse
| Possible Cause | 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 the valve. | N/A |
| Transaxle Internal Problems | Remove transaxle and have it professionally rebuilt. | N/A |
Transmission Will Not Downshift With Accelerator Pedal Fully Depressed
| Possible Cause | Checks | Procedure |
|---|---|---|
| Transaxle throttle cable out of adjustment | Adjust the cable. | N/A |
Tags:automatic transmissiontransaxleshiftingkickdownatfslip