P0053 or P0054

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0112, P0113, P0117, P0118 are not set.
The engine is started.
The ignition voltage is less than 18 volts.
The ignition is OFF for more than 10 hours.
The Engine Coolant Temperature (ECT) Sensor parameter is between -30 to +45°C (-22 to +113°F) at engine start-up.
The ECT Sensor parameter minus the Intake Air Temperature (IAT) Sensor parameter is less than 8°C (14°F) at engine start-up.
DTCs P0053 and P0054 run once per drive cycle when the above conditions are met.