This engine P1829 Code is related with the car engine where electronically controlled automatic transmissions works. The 3-4 shift solenoid is mainly accountable for activating the hydraulic tours to start clutches or bands that modification mechanisms inside the automatic transmission. If you cannot identify the problem, you must hand over the car to an expert automobile engineer who can fix the problem. However, checking the car engine manually is highly important thing and thus you can know about the permanent problem of the engine and fix the car engine. Do not drive the car with the car engine problem and solve the problem by an automobile engineer as soon as possible.