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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC P0645, P0646, or P0647 >> Conditions for Setting the DTC >> P0646

Conditions for Setting the DTC: P0646

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The ECM/PCM detects a short to ground on the control circuit of the A/C compressor clutch relay.

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