AutoCodes – Infiniti – B27A1 Infiniti

B27A1 Infiniti Code - Intake Door Motor

Quick Answer

A/C Auto Amplifier operates intake door motor according to the target value of the Potentiometer Balance Resister (PBR) opening angle at 40% when performing self-diagnosis. Common causes include Faulty Intake Door Motor, Intake Door Motor harness is open or shorted, Intake Door Motor 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: B27A1 Infiniti indicates Intake Door Motor.
Common causes: Common causes include Faulty Intake Door Motor, Intake Door Motor harness is open or shorted, Intake Door Motor 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 562

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 Feb 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B27A1 Infiniti Description

A/C Auto Amplifier operates intake door motor according to the target value of the Potentiometer Balance Resister (PBR) opening angle at 40% when performing self-diagnosis. The Diagnostic Trouble Code (DTC) when the PBR opening angle of intake door motor is 30% or less. (PBR feedback signal voltage of the intake door motor is 1.5 V or less).

OBDII Code B27A1 Infiniti - Intake Door Motor - AutoCodes.com — B27A1 Infiniti Code - Intake Door Motor

What does this mean?

What are the Possible Causes of the DTC B27A1 Infiniti?

Faulty Intake Door Motor
Intake Door Motor harness is open or shorted
Intake Door Motor circuit poor electrical connection
Faulty A/C Auto Amplifier

How to Fix the DTC B27A1 Infiniti?

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 B27A1 Infiniti 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 B27A1 Infiniti code?

Need more information on how to fix the B27A1 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 B27A1 Infiniti Code

1. What are the common symptoms of OBDII code B27A1 in an Infiniti related to the Intake Door Motor?

- Common symptoms include poor airflow distribution in the HVAC system, inconsistent heating or cooling inside the vehicle, and unusual clicking or grinding noises from the dashboard area.

2. What typically causes OBDII code B27A1 to trigger in an Infiniti's Intake Door Motor?

- The code is usually triggered by a malfunction in the Intake Door Motor itself, such as a failed motor, a broken gear mechanism, or electrical issues within the motor assembly.

3. How can I diagnose the OBDII code B27A1 in my Infiniti Intake Door Motor?

- Diagnosis involves using an OBDII scanner to retrieve the specific code, checking the HVAC system for airflow irregularities, and inspecting the Intake Door Motor for physical damage or abnormal operation.

4. Is it safe to continue driving my Infiniti with OBDII code B27A1 related to the Intake Door Motor?

- While it may be possible to drive the vehicle with this code present, it is not recommended as it can lead to uncomfortable driving conditions and potential further damage to the HVAC system.

5. Can I repair the Intake Door Motor issue causing OBDII code B27A1 in my Infiniti myself?

- Repairing the Intake Door Motor issue may require mechanical expertise and special tools, so it is recommended to consult with a professional mechanic or dealership for proper diagnosis and repair.

6. Are there any simple tips for maintaining the Intake Door Motor in my Infiniti to prevent OBDII code B27A1 from appearing?

- Regularly changing the cabin air filter, avoiding overloading the HVAC system, and ensuring proper airflow inside the vehicle can help maintain the Intake Door Motor's longevity.

7. How much does it typically cost to repair the Intake Door Motor issue causing OBDII code B27A1 in an Infiniti?

- Repair costs can vary depending on the extent of the damage and labor fees, but it is advisable to budget for a few hundred dollars for parts and labor.

8. Can resetting the OBDII system clear the B27A1 code related to the Infiniti Intake Door Motor?

- Resetting the OBDII system may temporarily clear the code, but it is crucial to address the root cause of the issue with the Intake Door Motor to prevent the code from reappearing.

9. What are the long-term effects of ignoring OBDII code B27A1 in an Infiniti's Intake Door Motor?

- Ignoring the code can lead to continued HVAC system malfunctions, decreased comfort levels while driving, and potential costly repairs if the issue worsens over time.

10. Is the OBDII code B27A1 related to the Infiniti Intake Door Motor a common issue among Infiniti vehicles?

- While not extremely common, issues with the Intake Door Motor leading to code B27A1 can occur in some Infiniti models, especially as the vehicle ages and components wear out.