Jeep Wrangler: STARTING THE ENGINE — GASOLINE ENGINE (IF EQUIPPED) / Normal Starting

Automatic Transmission — If Equipped

Start the vehicle with the gear selector in the PARK position (vehicle can also be started in NEUTRAL). Apply the brake before shifting to any driving range...

To Turn On The Engine Using The ENGINE START/STOP Button

The transmission must be in PARK or NEUTRAL. Press and hold the brake pedal while pushing the ENGINE START/STOP button once. The system takes over and attempts to start the vehicle...

Other information:

Jeep Wrangler 2018-2025 Owners Manual: SENTRY KEY

The Sentry Key Immobilizer system prevents unauthorized vehicle operation by disabling the engine. The system does not need to be armed or activated. Operation is automatic, regardless of whether the vehicle is locked or unlocked.  The system uses a key fob, keyless push button ignition and a Radio Frequency (RF) receiver to prevent unauthorized vehicle operation...

Jeep Wrangler 2018-2025 Owners Manual: Accessory Drive Belt Inspection

WARNING! Do not attempt to inspect an accessory drive belt with vehicle running. When working near the radiator cooling fan, disconnect the fan motor lead. The fan is temperature controlled and can start at any time regardless of ignition mode...