Cadillac ATS engine reduced power warning light activated on Cadillac ATS

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

Problem overview

Some Cadillac ATS owners report experiencing the "Reduced Engine Power" warning light activation, indicating potential issues with the engine or its systems. This warning is triggered when the vehicle's computer detects a problem that could lead to significant engine damage, resulting in the system entering low power mode to protect the engine. Common causes include issues with the throttle control system, Diagnostic Trouble Codes (DTCs), and the vehicle entering "limp mode." Owners are advised to follow the diagnostic codes to identify the specific component or system causing the reduced engine power. Additionally, the warning may be linked to a malfunctioning engine management sensor or the Engine Control Unit (ECU). It is crucial for owners to address the underlying cause of the reduced engine power warning to ensure the proper functioning of their Cadillac ATS.

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