check the shift cable, it may have broke or is way out of adjustment. You may need to move or remove some parts to get easy access to it. And sometimes even 1st to 2nd can be hard. This code will not cause a dead throttle or shifting problems like you have, but should be looked at. A bad TPS shouldn't effect shifting, at least not directly. Fault codes P2121 & P2122 are fault codes related the accelerator pedal position sensor or circuits. Last week car started up-shifting hard from 2nd to 3rd. The starting problem and strong gasoline odor is highly unlikely related directly to the transmission. If the throttle position sensor fails it can cause automatic transmission shifting problems. The throttle position sensor is important for proper automatic transmission control because it immediately establishes the driver’s intent, and transfers this information to the Transmission … It's like a jerk that can throw your head back and a slight bang is heard. Because the TP sensor is an input to the control module for various automatic transmission functions (e.g., shift points and torque converter clutch operation), a problem with the sensor can cause transmission performance issues. The TPS is mounted somewhere on the throttle linkage. The throttle position sensor is located near the throttle body itself. The computer in turn adjusts the amount of fuel based on engine speed, whether it's accelerating or decelerating, fuel mixture, and throttle position. The throttle position sensor will not make the transmission go into neutral at an idle. These codes are almost always caused by a faulty APPS. Sometimes, the throttle position sensor in modern cars can go bad. I knew I had already replaced the throttle position sensor (with an after market one) and did not consider this. At the same time the transmission cannot read the signal and puts the transmission into high line pressure to compensate, which results in very hard shifting. But I noticed that if I drive it a certain way, it is shifts smooth as silk. Signs that a throttle position sensor could be malfunctioning can include the check engine light being on or in the engine sometimes feels like it is going to die when the car is idling. I recommend replacing the sensor if there is moisture on the contacts, its broken, or its cracked. The incorrect electronic signals being sent by your bad throttle position sensor are also used by your automatic transmission's computer, to help it decide when and how to shift. With a fuel injection engine, the TPS tells the computer how far you have pressed the fuel pedal. For example, you might experience harsh or delayed shifting. so I started replacing & cleaning other related idol sensors. if the cable is ok, then check throttle position sensor at throttle plate on side of throttle body. (Down shift is okay.) The acceleration problems that are the result of a bad throttle position sensor can also affect the way that your transmission shifts . the cable for downshifting. What it might do is cause the engine to run at a higher rpm or a lower rpm, depending on the failure of the sensor. If I gave it hard or full throttle it would shift fine, but normal driving it would shift through all the gears, each too soon, bogging the engine down. Picture a little module in the car that reads how far down you have pressed the gas pedal. The Throttle Position Switch could have an effect on transmission shifting. The transmission shifts according to the throttle position and engine load (measured by manifold vacuum). This will either result in further damage to the fuel system, stalling, less than optimal fuel economy, and many other issues. 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