Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0050 or P0056

The ignition 1 signal parameter is between 9-18 volts.
The engine speed is more than 400 RPM.
DTCs 0050 or P0056 run once per drive cycle when the above conditions are met.

DTC P0059 or P0060

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 P0059 and P0060 run once per drive cycle when the above conditions are met.

DTC P0155

DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
The ECT Sensor parameter is more than 50°C (122°F).
The Ignition 1 Signal parameter is between 10-18 volts.
The MAF Sensor parameter is between 3-40 g/s.
The Engine Run Time parameter is more than 300 seconds.
The Engine Speed parameter is between 500-3,000 RPM.
DTC P0155 runs the heater current test once per drive cycle when the above conditions are met for 2 seconds.

DTC P0161

DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
The ECT Sensor parameter is more than 50°C (122°F).
The Ignition 1 Signal parameter is between 10-18 volts.
The MAF Sensor parameter is between 3-40 g/s.
The Engine Run Time parameter is more than 300 seconds.
The Engine Speed parameter is between 500-3,000 RPM.
DTC P0161 runs the heater current test twice per drive cycle when the above conditions are met for 2 seconds.