CARS.COM — Vehicles with an automatic transmission might not have a clutch and a stick shift, but they can still have trouble shifting. At times, drivers may have trouble getting the car out of Park and into gear. Problems with shifting your automatic transmission can come from a few different places, starting with the shift interlock feature. This is the part of an automatic transmission which requires you to step on the brake pedal to prevent unintentional shifting out of Park. If you are having trouble shifting the transmission, the interlock could be malfunctioning.
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If the interlock switch is worn and not fully releasing, or the brakelights don't receive a signal from the brakelight switch to illuminate (which makes the transmission think that the brakes aren't engaged), you won't be able to shift out of Park.
Alternatively, the shift cable or linkage connecting the shift lever to the transmission could be gummed up with grease or corroded so that it can't operate freely. Grease, dirt and moisture can collect in or on the interlock and brakelight switches as well as on the shift cable and related parts, hampering their operation and making it hard to shift into gear. When that happens, you're most likely to have problems shifting out of Park when the engine and transmission are cold, such as after the car has sat for hours. After the engine gets warm — and other parts throughout the vehicle get warmer, as well — the goo might become softer and make it easier to shift out of Park.
A transmission that's low on transmission fluid also can be hard to shift out of Park, though that also would likely cause a noticeable degradation in the transmission's overall performance, such as sluggish or harsh shifts. Changing the fluid is an infrequent maintenance item, but it still needs to be monitored.
Another possible cause is that when a vehicle is parked on even a slight incline, it will put more load on the transmission parking pawl (a bar that engages teeth in a transmission gear to prevent the vehicle from rolling). This is more likely to happen if you didn't engage the parking brake before releasing the brake pedal. The weight of the vehicle rolling onto the parking pawl makes it harder to shift out of Park. To avoid this, engage the parking brake when on an incline before shifting into Park or releasing the brake pedal. That way the parking brake, not the transmission pawl, bears the load and will allow you to shift freely.
If the vehicle won't shift out of park, don't be too alarmed — there's still a way to move it. Most cars have a means of overriding the shift lock to put the car in gear so you can drive to a mechanic for repairs rather than having it towed. A small door with a cover is often found on the console next to or close to the shifter itself. After prying this cover off, one can insert a screwdriver or key and press down to release the lock. Vehicles with column shifters (attached behind the steering wheel) may hide the release on top of the steering column or on the bottom. Your owner's manual will help you identify the location of the shift lock in your vehicle.
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