* Crank Position Sensor (CPS): This is a very common culprit in older vehicles. The CPS tells the computer the position of the crankshaft, which is essential for proper ignition timing. Heat from moving the vehicle *could* cause a failing CPS to malfunction temporarily. Once it cools down a bit, it may stop working.
* Cam Position Sensor (CMP): Similar to the CPS, but it reads the camshaft's position. A faulty CMP will also prevent the engine from starting. Like the CPS, heat could be a factor.
* Fuel Pump Relay or Fuse: While less likely given the short distance and time, a failing fuel pump relay or a blown fuse could cause the fuel pump to stop working after a short period.
* Ignition Switch: A failing ignition switch might not consistently supply power to the necessary components after a short run.
* Security System: If your Tahoe has a factory or aftermarket security system, it could have engaged unexpectedly. Check for any flashing lights or unusual noises related to the security system.
* Low Fuel Pressure: Although it moved, there might be an issue with the fuel system (fuel filter, fuel pump, etc.) that isn't immediately apparent. The low fuel pressure might be enough to start the engine initially but then it's insufficient after sitting.
* Loose Battery Connection: While less likely given the recent run, it's possible a loose connection could cause intermittent power issues after a short run.
* Distributor (If equipped): Older Tahoes might have distributors. A worn or failing distributor could cause starting problems.
Troubleshooting Steps:
1. Check the obvious: Ensure you have enough fuel. Check the battery connections (clean and tight). Check the fuses, especially for the fuel pump.
2. Listen Carefully: When you turn the key, do you hear the fuel pump prime? (A brief whirring sound should be audible for a second or two just before cranking). If not, suspect the fuel pump relay or fuse.
3. Error Codes: Use an OBD-II code reader to check for any diagnostic trouble codes (DTCs) stored in the vehicle's computer. This will point towards the most likely culprit.
4. Check the CPS and CMP: These are relatively easy to test (though you'll likely need a multimeter), but they require some automotive knowledge. Search for YouTube videos on how to check the CPS and CMP for your specific year Tahoe.
Since the issue happened after a short drive, heat-related issues (CPS or CMP) are higher on the list of probabilities. However, getting diagnostic codes read will be the best starting point for efficient diagnosis.
