Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- For DTC P1AC1 the SGCM detects a low voltage condition on the SGCM coolant fan relay control circuit.
- For DTC P1AC2 the SGCM detects a high voltage condition on the SGCM coolant fan relay control circuit.