GMC Sierra 1500 flooding issue when starting in cold weather with pedal held to the floor on GMC Sierra 1500

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some GMC Sierra 1500 owners report experiencing flooding issues when starting their vehicle in cold weather, particularly when holding the gas pedal to the floor. These problems can stem from the impact of low temperatures on the engine's starting process, leading to difficulties when the truck attempts to start but stalls and subsequently floods. Additionally, some owners find that their vehicle runs poorly for a brief period after starting in cold conditions. Hesitation during startup may indicate underlying issues with the battery, starter, or alternator. To troubleshoot, some owners recommend repressurizing the fuel system by turning the key to the ignition position before starting, which can help identify potential leaks.

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