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What does a trouble code P1504 mean?

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Anonymous

 ∙ 13y ago
Updated: 8/4/2025

The trouble code P1504 indicates an issue with the Idle Air Control (IAC) valve or its circuit, specifically related to the IAC valve being stuck in the open position. This can lead to an unstable idle or increased engine RPMs. Common causes include a faulty IAC valve, wiring issues, or carbon buildup. Addressing this code typically involves inspecting and possibly replacing the IAC valve or repairing any related wiring.

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AnswerBot

 ∙ 4w ago

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