AutoCodes – GMC – B0519 GMC

B0519 GMC Code - Rear Upper Duct Air Temperature Sensor Circuit

Quick Answer

The air temperature sensors are a 2-wire negative temperature coefficient thermistor. Common causes include 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. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0519 GMC indicates Rear Upper Duct Air Temperature Sensor Circuit.
Common causes: Common causes include 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.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,075

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0519 GMC Description

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 +80Â°C (-40 to +176Â°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.

OBDII Code B0519 GMC - Rear Upper Duct Air Temperature Sensor Circuit - AutoCodes.com — B0519 GMC Code - Rear Upper Duct Air Temperature Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B0519 GMC?

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 to Fix the DTC B0519 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0519 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B0519 GMC code?

Need more information on how to fix the B0519 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0519 GMC code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B0519 GMC Code

1. What are the common symptoms of OBDII code B0519 GMC?

- Common symptoms include issues with the rear upper duct air temperature sensor, such as inaccurate temperature readings or a malfunctioning sensor.

2. What can cause the OBDII code B0519 GMC to trigger?

- The B0519 code is typically triggered by a faulty rear upper duct air temperature sensor circuit or a problem with the sensor itself.

3. How can I diagnose the cause of OBDII code B0519 GMC?

- To diagnose the issue, you can use an OBDII scanner to read the trouble code and perform a visual inspection of the rear upper duct air temperature sensor and its wiring for any visible damage.

4. What are the repair options for OBDII code B0519 GMC?

- Repair options may include replacing the rear upper duct air temperature sensor, repairing or replacing damaged wiring, or resetting the trouble code after addressing any underlying issues.

5. Can I drive my vehicle with OBDII code B0519 GMC?

- It is generally not recommended to drive your vehicle with an unresolved OBDII code, as it can lead to potential performance issues or further damage to the sensor circuit.

6. How much does it typically cost to repair OBDII code B0519 GMC?

- The cost of repairing OBDII code B0519 GMC can vary depending on the extent of the issue, but it may involve parts and labor expenses for sensor replacement or wiring repairs.

7. Are there any DIY tips for addressing OBDII code B0519 GMC?

- DIY tips may include checking and cleaning the sensor connections, ensuring proper wiring connections, and consulting the vehicle's service manual for specific troubleshooting steps.

8. Can a faulty rear upper duct air temperature sensor affect my vehicle's performance?

- Yes, a faulty rear upper duct air temperature sensor can impact the vehicle's fuel mixture, emissions control, and overall engine performance.

9. How long does it typically take to repair OBDII code B0519 GMC?

- The repair time for OBDII code B0519 GMC can vary depending on the complexity of the issue and the availability of parts, but it may range from a few hours to a day.

10. Is it necessary to reset the OBDII system after repairing code B0519 GMC?

- Yes, it is recommended to reset the OBDII system after addressing and repairing the issue related to code B0519 GMC to clear the trouble code and ensure proper functioning of the sensor circuit.