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I have an 2007 sxt. Last night I went to go somewhere and my car would not accelerate past 2000 rpms. I took it to autozone and the codes P0700 and P0602 came up. When the car is in park or neutral it accelerates normally. I already unplugged my battery to reset anything and that didn't work.
 

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The P0700 refers to your transmission control module. I THINK both may be caused by a weak battery. Go get it load tested. Here's what I found on the P0602.
Diagnosing a code P0602 can be challenging, even to the most experienced and well equipped technician. Nevertheless, there are a few preliminary tests that can be performed before throwing your hands in the air and passing the problem off to someone else. As usual, I would begin my diagnosis with a visual inspection of engine management wiring harnesses and connectors. Any wiring and connectors that have been damaged or burned should be repaired or replaced. Next, I would connect the scanner to the vehicle diagnostic connector and retrieve all stored codes and freeze frame data. Before clearing the codes, I would write them down just in case this proves to be an intermittent code. A code P0602 must be diagnosed and repaired before diagnosing and repairing any other stored codes, as other stored codes are likely to be false. Now clear the codes in the hope that the P0602 has been stored in error. If the P0602 is immediately reset, check for battery voltage to the PCM. The PCM requires battery voltage to function properly. If the battery terminals are corroded or loose, there may be inadequate voltage reaching the PCM. Check PCM relays and fuses for battery voltage with the circuit loaded. Corroded fuses may appear normal until a load is applied to the circuit and their deficiency is revealed. Obviously, if the PCM has been recently replaced, the likelihood that it was improperly programmed or not programmed at all is great. Also, a controller from another vehicle cannot be used unless it has been reprogrammed specifically for the vehicle in question and aftermarket (high-performance) programmers may not be recognized by other controllers (especially at first), causing a P0602 to be stored. Incorrectly programmed or replaced controllers may be reprogrammed with a factory scanner. If you cannot gain access to such a scanner, most dealerships offer PCM programming for a nominal fee. Some aftermarket PCM manufacturers offer preprogrammed controllers for certain models. Check your auto parts supplier and have the vehicle identification number, mileage, and other pertinent data available. Additional diagnostic notes: New or used, a replacement PCM will need to be programmed to match the vehicle in question Aftermarket or high-performance programmers will frequently require time for other controllers to recognize them - if they ever do

Read more at: https://www.obd-codes.com/p0602
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