Car Not Shifting Gears Automatic Transmission
Causes
There are a number of potential causes for an automatic transmission not shifting gears, including:
- Low transmission fluid
- Dirty or contaminated transmission fluid
- Faulty solenoid
- Faulty torque converter
- Faulty transmission control module (TCM)
Symptoms
The symptoms of an automatic transmission not shifting gears can vary depending on the underlying cause, but may include:
- The transmission slipping or hesitating when shifting gears
- The transmission refusing to shift gears
- The transmission shifting gears erratically
- The transmission making a grinding or whining noise when shifting gears
Diagnosis
To diagnose an automatic transmission not shifting gears, a mechanic will typically start by checking the transmission fluid level and condition. If the fluid is low or dirty, it will need to be replaced. The mechanic may also check the solenoids and torque converter for any signs of damage or wear. If the solenoids or torque converter are faulty, they will need to be replaced.
The mechanic may also use a scan tool to check the TCM for any trouble codes. If the TCM is faulty, it will need to be replaced.
Repair
The repair for an automatic transmission not shifting gears will depend on the underlying cause. In some cases, the repair may be as simple as replacing the transmission fluid. In other cases, the repair may require replacing the solenoids, torque converter, or TCM. In some cases, the transmission may need to be rebuilt or replaced.
Prevention
There are a few things you can do to help prevent your automatic transmission from not shifting gears, including:
- Regularly check the transmission fluid level and condition
- Change the transmission fluid and filter according to the manufacturer’s recommended schedule
- Avoid overloading your vehicle
- Drive in the correct gear for the road conditions
By following these tips, you can help keep your automatic transmission shifting smoothly for years to come.
