* Low Transmission Fluid: Insufficient fluid or fluid that's old and dirty can't properly lubricate the transmission components, leading to harsh shifts and jerking. Check the fluid level and condition. If it's low, add the correct type of fluid (consult your owner's manual). If it's dirty, a transmission fluid and filter change is necessary.
* Worn Transmission Components: Internal transmission parts like clutches, bands, or valve bodies can wear out over time. This wear causes slippage and inconsistent engagement, resulting in jerking. This usually requires a transmission repair or replacement.
* Solenoid Problems: The solenoids control the flow of transmission fluid. Faulty solenoids can cause incorrect shifting, leading to jerking. These are relatively inexpensive to replace, but diagnosing the specific faulty solenoid requires testing.
* Torque Converter Issues: The torque converter connects the engine to the transmission. A failing torque converter can cause slipping and jerking, especially during shifts. Replacement is usually necessary.
* Shift Linkage/Cable Problems (if applicable): While less common in this era of electronically controlled transmissions, worn or damaged shift linkage or cables (if it uses them) can cause imprecise shifting and jerking.
* Computer Problems (TCM): The Transmission Control Module (TCM) controls the transmission's operation. A faulty TCM can cause erratic shifting and jerking. Diagnosis requires specialized tools and potentially replacement of the TCM.
* Engine Problems: While less likely to directly cause jerking *during* shifts, engine problems like misfires or poor performance can indirectly contribute to rough shifting as the transmission struggles to cope with inconsistent power delivery.
Diagnosis:
Pinpointing the exact cause requires a proper diagnosis. Here's what you should do:
1. Check the transmission fluid: This is the easiest and cheapest check.
2. Have a mechanic inspect it: A qualified mechanic can perform a thorough inspection, diagnose the problem, and recommend the appropriate repair. They may use a scanner to check for transmission codes.
3. Consider the driving habits: Aggressive driving can contribute to premature wear and tear.
Ignoring the jerking can lead to more serious and costly transmission damage. It's advisable to address the issue promptly.
