AutoCodes – Generic – B3578

B3578 Code - Output Air Temperature Sensor 6 Circuit

Quick Answer

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. Common causes include Faulty Output Air Temperature Sensor 6, Output Air Temperature Sensor 6 harness is open or shorted, Output Air Temperature Sensor 6 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B3578 indicates Output Air Temperature Sensor 6 Circuit.
Common causes: Common causes include Faulty Output Air Temperature Sensor 6, Output Air Temperature Sensor 6 harness is open or shorted, Output Air Temperature Sensor 6 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,653

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 09, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3578 Description

Air 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.

OBDII Code B3578 - Output Air Temperature Sensor 6 Circuit - AutoCodes.com — B3578 Code - Output Air Temperature Sensor 6 Circuit

What does this mean?

What are the Possible Causes of the DTC B3578?

Faulty Output Air Temperature Sensor 6
Output Air Temperature Sensor 6 harness is open or shorted
Output Air Temperature Sensor 6 circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B3578?

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 does this mean?

Code Tech Notes

B3578 05: Output Air Temperature Sensor 6 Circuit Short to Battery or Open
B3578 02: Output Air Temperature Sensor 6 Circuit Short to Ground

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3578 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 B3578 code?

Need more information on how to fix the B3578 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3578 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3578 Buick — Output Air Temperature Sensor 6 Circuit
B3578 Cadillac — Output Air Temperature Sensor 6 Circuit
B3578 Chevrolet — Output Air Temperature Sensor 6 Circuit
B3578 GMC — Output Air Temperature Sensor 6 Circuit

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 B3578 Code

1. What are common symptoms of OBDII code B3578 related to the Output Air Temperature Sensor 6 Circuit?

- Common symptoms include poor engine performance, decreased fuel efficiency, and potential issues with the vehicle's emissions system.

2. What are the possible causes of OBDII code B3578 indicating an issue with the Output Air Temperature Sensor 6 Circuit?

- Potential causes include a faulty temperature sensor, damaged wiring or connectors, a malfunctioning PCM (powertrain control module), or issues with the air temperature sensor circuit.

3. How can I diagnose the OBDII code B3578 for the Output Air Temperature Sensor 6 Circuit issue?

- Diagnosis involves using an OBDII scanner to retrieve the trouble code, checking the sensor's wiring and connectors for damage, and testing the sensor's resistance to determine if it is faulty.

4. What are the recommended repair tips for fixing OBDII code B3578 related to the Output Air Temperature Sensor 6 Circuit?

- Repair tips may include replacing the faulty temperature sensor, repairing damaged wiring or connectors, resetting the PCM, and clearing the trouble code to see if the issue persists.

5. Can OBDII code B3578 cause damage to other vehicle components if left untreated?

- If left untreated, OBDII code B3578 may lead to decreased engine performance, reduced fuel efficiency, and potential damage to the vehicle's emissions system over time.

6. Are there any specific vehicle models or makes more prone to experiencing OBDII code B3578 for the Output Air Temperature Sensor 6 Circuit?

- While this code can potentially occur in any vehicle with an OBDII system, some models or makes may have a higher incidence of issues related to the output air temperature sensor circuit.

7. How can I prevent OBDII code B3578 from occurring in the future?

- Regular maintenance and inspections of the vehicle's sensors, wiring, and connectors can help prevent issues leading to OBDII code B3578. Additionally, addressing any related trouble codes promptly can help prevent further issues.

8. Is it safe to continue driving my vehicle with OBDII code B3578 present?

- It is generally not recommended to continue driving with OBDII code B3578 present, as it can lead to performance issues and potential damage to the vehicle over time. It is best to address the underlying issue promptly.

9. Can resetting the OBDII system clear the B3578 code related to the Output Air Temperature Sensor 6 Circuit?

- Resetting the OBDII system may clear the trouble code temporarily, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is essential to diagnose and repair the root cause of the code.

10. How long does it typically take to repair OBDII code B3578 for the Output Air Temperature Sensor 6 Circuit?

- The time needed to repair OBDII code B3578 can vary depending on the specific cause of the issue, the availability of parts, and the expertise of the individual performing the repair. In some cases, the repair can be completed within a few hours.