Cadillac transmission park position switch 1 circuit voltage is too high.

1, switch failure: Sometimes the parking position switch 1 is damaged or short-circuited, resulting in high circuit voltage.

2. Short circuit: Short circuit sometimes occurs in the circuit, resulting in high voltage, such as wire wear or damage.

3. Control unit failure: Transmission control unit failure or damage, unable to effectively control the parking position switch 1, resulting in high circuit voltage.

4. Other reasons: such as interference between lines, abnormal battery voltage will also lead to high circuit voltage.