DTC B1542: Oil Temperature Circuit (Short To Ground): Description

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Instrument Panel Cluster (IPC) receives oil temperature information from oil temperature sensor. Oil temperature sensor will produce high resistance when engine oil temperature is low, and low resistance when engine oil temperature is high. IPC supplies a 5-volt reference signal to oil temperature sensor. When engine oil is cold, sensor resistance will decrease, and IPC reference voltage level will drop. IPC checks reference voltage change and displays calculated value on gauge.

DTC B1542 will set when IPC detects oil temperature greater than 374°F (190°C) or IPC detects a low voltage level (short to ground) in Dark Green/White wire between oil temperature sensor and IPC for one second. When DTC B1542 is set, IPC will display oil temperature at greater than 374°F (190°C). If Dark Green/White wire or oil temperature sensor is shorted to ground, IPC will display a constant oil temperature of 392°F (200°C). Drivers Information Center (DIC) will also display HIGH OIL TEMPERATURE REDUCE ENGINE RPM message.

If conditions for malfunction no longer exist, history DTC will clear after 50 consecutive ignition cycles. DTC B1542 will also clear when conditions no longer exist, or when IPC or scan tool is used to clear codes.