GMC Sierra 2500 HD engine light on, dealer indicates three faulty fuel injectors causing excessive fuel dump on GMC Sierra 2500 HD

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

Problem overview

Some GMC Sierra 2500 HD owners report experiencing issues with the check engine light illuminating due to faulty fuel injectors, which can lead to excessive fuel dump and negatively impact engine performance and fuel efficiency. These owners have learned from their dealers that three faulty fuel injectors may require replacement or repair to resolve the problem. Ignoring these faulty injectors can result in poor engine performance, decreased fuel efficiency, and potential damage to other engine components. Repair options may involve replacing or repairing the injectors to restore proper engine function, and owners should consider the associated costs and the potential impact on their vehicle's overall performance and longevity. It is advisable for owners to address this issue promptly to ensure their vehicle functions properly and to prevent further complications.

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