Two problems related to automatic transmission have been reported for the 1999 GMC Sonoma. The most recently reported issues are listed below.
When in 2 or 4wd on a steep hill in 2nd gear truck does not move. The trans. Will slip and the truck shakes. The owners manual said to use 2nd for.
When vehicle is in or out of gear engine idles, rpm will flucuate between 1600-3000 intermittently. Dealer ehas replaced idle motor, throttle positioner, new computer , and new software for computer. After several attempts to correct defect, dealer is claiming it is normal.
| Automatic Transmission problems | |
| Differential Unit problems | |
| Automatic Transmission Torque Converter problems | |
| Clutch problems | |
| Transmission Noise problems | |
| Axle Shaft problems |