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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P1258 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The engine control module (ECM) or powertrain control module (PCM) uses the engine coolant temperature (ECT) sensor to monitor the engine for an overtemperature condition. This condition occurs when the coolant temperature is above a calibrated value for a calibrated length of time. The ECM or PCM will disable half of the cylinders by turning OFF the fuel injectors. By disabling half of cylinders, the ECM or PCM is able to reduce the temperature of the coolant.

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