The engine B2598 Code is related with the car engine and if you are an engineer, you need to get the car engine fixed, you should use the manufacturer meanings. The general meaning of the code is not useful but you can use this information for learning. However, no professional automobile engineer needs to use the general meaning for solving the car engine. You need read the manual of the car engine where you will get the manufacturer name and model number. In Key On, this DTC specifies that the PSP input did not alter state. Some expensive machines are necessary to use for solving the car engine.