B0178 CHEVROLET - Output Air Temperature Sensor 2 Circuit
B0178 CHEVROLET Possible Causes
- Faulty Output Air Temperature Sensor 2
- Output Air Temperature Sensor 2 harness is open or shorted
- Output Air Temperature Sensor 2 circuit poor electrical connection
- Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
How is the B0178 CHEVROLET code repair?Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
B0178 02: Output Air Temperature Sensor 2 Circuit Short to Ground
What is the cost to diagnose the B0178 CHEVROLET code
Labor: 1.0The cost to diagnose the B0178 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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- Engine Light ON (or Service Engine Soon Warning Light)
B0178 CHEVROLET MeaningAir temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. The module applies 5 volts to internal input resistors that are connected to the signal circuits of the air temperature sensors. The module provides ground to the air temperature sensors through the low reference circuit. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. When the duct air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the duct air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module converts the voltage values to count values where 1 volt is approximately equal to 51 counts.
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