GMC Sonoma won't start when temperature exceeds 120 degrees on GMC Sonoma

Some GMC Sonoma owners report experiencing starting issues when temperatures exceed 120 degrees, which may be attributed to several common problems. These issues can include a dead battery, alternator problems, or a failed starter, often indicated by dim interior lighting. Additionally, some owners find that a malfunctioning engine coolant temperature sensor can contribute to starting difficulties, particularly in extreme heat. Problems with the distributor cap, rotor, or distributor not functioning properly may also lead to starting failures. Furthermore, the ignition switch, separate from the key lock cylinder, is a critical component that can impact the vehicle's ability to start. To address these concerns, it is recommended that owners inspect the battery, starter, alternator, engine coolant temperature sensor, distributor components, and ignition switch promptly.