* Alternator: While you say the battery is OK, a failing alternator might not be charging the battery effectively. Under load (e.g., turning the steering wheel, using accessories), the voltage might drop too low, causing the engine to stall. Test the alternator's output voltage while the engine is running.
* Ignition Switch: A faulty ignition switch can interrupt power to the engine's control systems. This is a common failure point in older vehicles.
* Neutral Safety Switch: This switch prevents the engine from starting unless the transmission is in Park or Neutral. A malfunctioning switch can cut power unexpectedly.
* Crankshaft Position Sensor (CKP Sensor): This sensor tells the engine's computer the position of the crankshaft. A faulty sensor will prevent the engine from running. This is a frequent cause of no-start conditions.
* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, a malfunctioning CMP sensor can cause the engine to stall unexpectedly.
* Power Distribution Center (PDC) or Fuse Box: A short circuit or a failing component within the PDC can cut power to various systems, including the engine.
* Wiring Harness Issues: Corrosion, broken wires, or poor connections in the main wiring harness can lead to intermittent power loss. This is difficult to diagnose without a thorough inspection.
* Bad Ground: A poor connection between the engine block or chassis and the negative battery terminal can prevent proper electrical flow.
* PCM (Powertrain Control Module): While less likely to cause a sudden complete power loss, a failing PCM can certainly cause erratic behavior and engine stalling.
Important Note: Simply checking the battery voltage with a voltmeter doesn't fully assess its health. It could have a failing cell that provides sufficient voltage at rest but fails under load. A proper battery load test is recommended.
What to do:
Don't attempt extensive DIY repairs unless you have significant automotive electrical experience. A sudden power loss is dangerous and could indicate a serious underlying problem. Take your Jeep to a qualified mechanic for diagnosis and repair. They have the tools and expertise to pinpoint the cause efficiently and safely. Providing them with a detailed description of when the power loss occurs (e.g., while turning, accelerating, braking) will help them narrow down the possibilities.
