AutoCodes – GMC – B0515 GMC

B0515 GMC Code - Output Air Temperature Sensor 4 Circuit Range/Performance

Quick Answer

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the discharge duct air, outside air and inside air temperatures. Common causes include Faulty Output Air Temperature Sensor 4, Output Air Temperature Sensor 4 harness is open or shorted, Output Air Temperature Sensor 4 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: B0515 GMC indicates Output Air Temperature Sensor 4 Circuit Range/Performance.
Common causes: Common causes include Faulty Output Air Temperature Sensor 4, Output Air Temperature Sensor 4 harness is open or shorted, Output Air Temperature Sensor 4 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 1,394

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 B0515 GMC Description

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the discharge duct air, outside air and inside air temperatures. The HVAC control module provides ground to the air temperature sensor through the low reference circuit. The HVAC control module monitors the voltage drop across the air temperature sensor thermistor by supplying a 5 volt reference to the signal circuit of the air temperature sensor for automatic control calculations. When the air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module can read voltage values and count values where 1 volt is approximately equal to 51 counts.

OBDII Code B0515 GMC - Output Air Temperature Sensor 4 Circuit Range/Performance - AutoCodes.com — B0515 GMC Code - Output Air Temperature Sensor 4 Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC B0515 GMC?

Faulty Output Air Temperature Sensor 4
Output Air Temperature Sensor 4 harness is open or shorted
Output Air Temperature Sensor 4 circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0515 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 B0515 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.

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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 B0515 GMC Code

1. What does the OBDII code B0515 on a GMC indicate?

The code B0515 indicates an issue with the Output Air Temperature Sensor 4 Circuit, specifically pointing to a range/performance problem. This means the sensor's output is not within the expected range or it is not performing correctly.

2. What symptoms might I notice if my GMC has the B0515 code?

Symptoms can include improper climate control operation, where the air temperature from the HVAC system does not match the settings, or fluctuating temperatures. You may also see the check engine light illuminated.

3. What could cause the B0515 code to appear in a GMC?

Possible causes include a faulty air temperature sensor, wiring issues such as shorts or open circuits in the sensor wiring, or problems with the climate control unit itself.

4. How can I diagnose the B0515 code in my GMC?

Diagnosis should begin with visually inspecting the sensor and its connections for any obvious signs of damage or disconnection. Following this, using a multimeter to check the sensor's resistance and voltage output compared to manufacturer specifications can help determine if the sensor is functioning properly.

5. What steps should be taken to fix the B0515 code on a GMC?

Repair steps could include replacing the faulty air temperature sensor, repairing any damaged wires or connectors in the circuit, or potentially replacing or repairing the climate control unit if it is found to be the cause.

6. Is it safe to drive my GMC with the B0515 code active?

While you may not experience immediate drivability issues, prolonged driving with an unresolved B0515 code can lead to discomfort due to improper HVAC operation and potentially more significant issues with the climate control system over time.

7. How urgent is it to address the B0515 code on a GMC?

It is moderately urgent to address this issue, mainly for comfort and to prevent potential escalation of the problem. It is advisable to fix it as soon as reasonably possible, especially to ensure proper operation of the climate control system.

8. Can a B0515 code affect the fuel economy of my GMC?

Indirectly, yes. If the climate control system is working harder to maintain the desired cabin temperature due to a sensor issue, it can slightly increase fuel consumption.

9. What tools are needed to diagnose and repair the B0515 code?

Tools needed might include a diagnostic scanner to read and clear codes, a multimeter for electrical testing, and basic hand tools to access and replace the sensor or wiring.