1. The Obvious Checks (Do these FIRST):
* Shift Lever: Make absolutely sure the parking brake is OFF. Try gently rocking the car back and forth while attempting to shift. Sometimes a slight movement can free a stuck lever.
* Transmission Fluid: Check your transmission fluid level. Low fluid can cause shifting problems. If it's low, you'll need to add fluid (the correct type for your Impala's transmission – check your owner's manual). *Do not overfill*.
* Brake Pedal: Ensure the brake pedal is fully depressed. Some vehicles require the brake to be pressed to shift out of park.
* Steering Wheel: In some vehicles, a slightly turned steering wheel can prevent shifting out of park. Try straightening the wheel.
* Shift Interlock Cable: Some Impalas (depending on the year and model) may have a shift interlock cable that prevents shifting out of park if the ignition is not in the "on" or "accessory" position. Make sure the ignition is in the correct position.
2. If the Obvious Checks Fail:
* Check the Shift Linkage: Under the car, locate the shift linkage. This is the mechanical connection between the shift lever and the transmission. Carefully inspect for any visible damage, such as bent or broken parts. However, this requires some mechanical knowledge and comfort working under the car. If you're not comfortable doing this, skip to step 3.
* Battery: A weak battery can sometimes affect the car's electrical systems, including the shift interlock. Try jump-starting the car.
3. When You Need Professional Help:
If none of the above solves the problem, it's time to call a professional:
* Towing: Don't try to force the shift lever. Forcing it could cause further damage. Towing is the safest option until a mechanic can diagnose the problem.
* Mechanic: A qualified mechanic can diagnose the issue. Possible causes that require professional attention include:
* Faulty shift interlock solenoid: This is an electrical component that controls the shift mechanism.
* Broken shift cable or linkage: This requires repair or replacement.
* Internal transmission problem: This is a more serious issue and could require a transmission repair or replacement.
* Low or contaminated transmission fluid: This needs to be addressed by a professional to determine the root cause.
Important Safety Note: Never attempt to bypass the shift interlock mechanism. This is a safety feature designed to prevent accidental movement of the vehicle. Doing so can be dangerous and potentially illegal.
By systematically checking these points, you'll increase your chances of resolving the problem or at least providing a mechanic with valuable information to quickly diagnose the cause. Remember safety first!
