GMC Sierra 2500 HD starts then dies due to failing RUN/CRANK relay replacement issue on GMC Sierra 2500 HD

Some GMC Sierra 2500 HD owners report experiencing starting issues where the vehicle starts but then immediately dies, which may be linked to problems with the RUN/CRANK relay. These intermittent starting problems can stem from various causes, including a damaged battery, bad battery connectors, faulty relays, or bad ground points. Symptoms of a dead battery can manifest as slow engine cranking, dim lights, or clicking noises when attempting to start. Additionally, some owners of models like the 2004 Sierra 2500 HD Duramax have noted that nothing happens when the key is turned to run, indicating potential starting issues. Other possible causes for the engine dying shortly after starting include a malfunctioning fuel pump, clogged fuel filter, faulty ignition switch, or issues with the engine control module. Insufficient fuel pressure, often due to a failing fuel pump, can also lead to starting and stalling problems. Therefore, it is advisable for owners facing these issues to check the RUN/CRANK relay's condition as part of their troubleshooting process.