What are the reasons why a Cadillac won't start?

[Molly]

Possible reasons: engine system failure; body network failure; anti-theft system failure. More relevant information is as follows: 1. Analysis and confirmation: After receiving the vehicle, test driving confirms the fault phenomenon is true. Based on the fault phenomenon, the main causes of this fault are analyzed as follows: engine system failure; body network failure; anti-theft system failure. 2. Note: When attempting to start the engine, it is found that the starter can operate normally, but the engine fails to start, and the anti-theft indicator light on the dashboard extinguishes normally after self-check. Based on this phenomenon, body network failure is preliminarily ruled out, because if the engine's failure to start is caused by a network failure, pressing the start button would result in the dashboard lights turning on and then instantly turning off, with the starter showing no response. If it's an anti-theft system failure, the anti-theft light on the dashboard would not extinguish after self-check when the key is turned on.