#CarMechanic,

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The Buick trouble code P2312 typically indicates an issue with the ignition coil secondary circuit on cylinder 3. This code suggests that there may be a malfunction or failure in the ignition system, particularly affecting cylinder 3. The ignition coil is responsible for generating the high voltage needed to ignite the air-fuel mixture in the combustion chamber, and any disruption in its operation can lead to misfires or poor engine performance.