AutoCodes – GMC – B0272 GMC

B0272 GMC Code - Air Flow Control 7 Circuit Open

Quick Answer

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. Common causes include Faulty Recirculation Actuator, Recirculation Actuator harness is open or shorted, Recirculation Actuator 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: B0272 GMC indicates Air Flow Control 7 Circuit Open.
Common causes: Common causes include Faulty Recirculation Actuator, Recirculation Actuator harness is open or shorted, Recirculation Actuator 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 764

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 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0272 GMC Description

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. With the switches and dials on the HVAC controls, air temperature door position, mode door position and recirculation door position can be selected. The selected values are passed to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module via serial data. The HVAC control module supplies a 12 V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors move the appropriate doors into the calculated positions, in order to reach the desired positions.

OBDII Code B0272 GMC - Air Flow Control 7 Circuit Open - AutoCodes.com — B0272 GMC Code - Air Flow Control 7 Circuit Open

What does this mean?

What are the Possible Causes of the DTC B0272 GMC?

Faulty Recirculation Actuator
Recirculation Actuator harness is open or shorted
Recirculation Actuator circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0272 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 B0272 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 B0272 GMC Code

1. What are the common symptoms of OBDII code B0272 GMC (Air Flow Control 7 Circuit Open)?

- Common symptoms include rough idling, reduced engine performance, and potential stalling.

2. What are the possible causes of OBDII code B0272 GMC (Air Flow Control 7 Circuit Open)?

- The code can be triggered by a faulty air flow control circuit, damaged wiring, or a malfunctioning air flow control actuator.

3. How can I diagnose OBDII code B0272 GMC (Air Flow Control 7 Circuit Open)?

- Diagnose the code by checking the air flow control system for any visible damage, testing the wiring and connectors, and using a diagnostic scanner to pinpoint the issue.

4. Can a dirty air filter trigger OBDII code B0272 GMC?

- While a dirty air filter can impact engine performance, it is not a direct cause of OBDII code B0272 GMC. Focus on checking the air flow control components for issues.

5. How can I repair OBDII code B0272 GMC (Air Flow Control 7 Circuit Open) at home?

- Repair options include replacing the faulty air flow control actuator, repairing damaged wiring, and ensuring all connections are secure and functioning properly.

6. Is it safe to continue driving with OBDII code B0272 GMC active?

- It is not recommended to drive with the code active, as it can lead to further engine issues and potential breakdowns. Address the problem promptly.

7. Will resetting the OBDII system clear the B0272 GMC code?

- Resetting the system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear. It's essential to diagnose and repair the problem.

8. Can extreme weather conditions cause OBDII code B0272 GMC to trigger?

- Extreme weather conditions can potentially exacerbate existing issues that lead to the code, such as causing wiring or components to malfunction. Inspect the system for any weather-related damage.

9. How much does it typically cost to repair OBDII code B0272 GMC at a mechanic?

- The cost of repair can vary depending on the extent of the damage and the labor rates of the mechanic. It's advisable to get a diagnostic and repair estimate from a trusted mechanic.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B0272 GMC?

- A DIY enthusiast with basic automotive knowledge may be able to address the issue by following repair guides, using the right tools, and being methodical in diagnosing and repairing the problem.