Cadillac DeVille auxiliary air pump failure causing check engine light issue on Cadillac DeVille

Some Cadillac DeVille owners report experiencing issues with the auxiliary air pump, which can lead to the illumination of the check engine light. This problem often arises when water enters the secondary air injection pump, causing it to fail and triggering the warning light. To mitigate this issue, General Motors provides a kit designed to relocate the air intake for the pump, helping to prevent future water damage. If left unaddressed, this problem could escalate into more serious issues and result in costly repairs. Therefore, it is crucial for owners to resolve check engine light concerns promptly to avoid further damage to the vehicle.