Engine-Codes - Gmc - B0519 GMC

B0519 GMC - Rear Upper Duct Air Temperature Sensor Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B0519 GMC Possible Causes

  • Faulty Rear Upper Duct Air Temperature Sensor
  • Rear Upper Duct Air Temperature Sensor harness is open or shorted
  • Rear Upper Duct Air Temperature Sensor circuit poor electrical connection
  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How is the B0519 GMC 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.

What is the cost to diagnose the B0519 GMC code

Labor: 1.0

The cost to diagnose the B0519 GMC 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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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B0519 GMC Meaning

The air temperature sensors are a 2-wire negative temperature coefficient thermistor. This sensor operates using signal and low reference circuits. As the air temperature surrounding the sensor increases, the sensor resistance decreases. The sensor is capable of reading temperatures ranging from -40 to +80°C (-40 to +176°F), with a signal voltage between 0-5 V. If the HVAC control module detects a malfunctioning sensor the software uses a default air temperature value. The default action ensures that the HVAC system can adjust the inside air temperature near the desired temperature until the condition is corrected. The Diagnostic Trouble Code (DTC) sets when the input signal is out of range. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module detects voltage greater than 4.9 V on the temperature signal circuit.

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