AutoCodes – Infiniti – B27A8 Infiniti

B27A8 Infiniti Code - Mode Door Motor

Quick Answer

A/C Auto Amplifier operates intake door motor according to the target value of the Potentiometer Balance Resister (PBR). Common causes include Faulty Mode Door Motor, Mode Door Motor harness is open or shorted, Mode 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: B27A8 Infiniti indicates Mode Door Motor.
Common causes: Common causes include Faulty Mode Door Motor, Mode Door Motor harness is open or shorted, Mode 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 586

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 B27A8 Infiniti Description

A/C Auto Amplifier operates intake door motor according to the target value of the Potentiometer Balance Resister (PBR). The Diagnostic Trouble Code (DTC) when the A/C Auto Amplifier detects a short or open circuit of mode door motor drive signal terminal 3.

OBDII Code B27A8 Infiniti - Mode Door Motor - AutoCodes.com — B27A8 Infiniti Code - Mode Door Motor

What does this mean?

What are the Possible Causes of the DTC B27A8 Infiniti?

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

How to Fix the DTC B27A8 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 B27A8 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 B27A8 Infiniti code?

Need more information on how to fix the B27A8 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B27A8 Infiniti 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 B27A8 Infiniti Code

1. What is the OBDII code B27A8 in an Infiniti related to the Mode Door Motor?

This code indicates a malfunction in the mode door motor, which controls the direction of airflow in the HVAC system.

2. What are common symptoms of a faulty Mode Door Motor in an Infiniti?

Common symptoms include inconsistent or incorrect airflow from the vents, strange noises coming from the HVAC system, or the inability to change the airflow direction.

3. What are possible causes of the B27A8 OBDII code related to the Mode Door Motor?

The code may be triggered by a failed mode door motor, wiring issues, a faulty control module, or a problem with the HVAC system's blend doors.

4. How can I diagnose the B27A8 code in my Infiniti related to the Mode Door Motor?

Diagnosis typically involves using a scan tool to read the code, inspecting the mode door motor and its wiring for damage, and checking the HVAC system for any other issues.

5. Can I drive my Infiniti with the B27A8 OBDII code related to the Mode Door Motor?

It is generally safe to drive the vehicle with this code, but you may experience discomfort due to the HVAC system not functioning properly.

6. How can I repair the B27A8 code in my Infiniti related to the Mode Door Motor?

Repair involves replacing the faulty mode door motor, addressing any wiring issues, resetting the code with a scan tool, and testing the HVAC system to ensure proper operation.

7. Are there any DIY tips for fixing the B27A8 OBDII code related to the Mode Door Motor in an Infiniti?

While some may attempt to replace the mode door motor themselves, it's recommended to consult a professional technician for this repair due to the complexity of the HVAC system.

8. How much does it cost to repair the B27A8 code related to the Mode Door Motor in an Infiniti?

The cost of repair can vary depending on the specific issue, parts needed, and labor rates, but it's advisable to budget for several hundred dollars for this type of repair.

9. Can a faulty Mode Door Motor affect the overall performance of my Infiniti?

While the mode door motor primarily impacts the HVAC system, a malfunction could indirectly affect cabin comfort and potentially the efficiency of the heating and cooling system.

10. How can I prevent future issues with the Mode Door Motor in my Infiniti?

Regular maintenance of the HVAC system, addressing any airflow issues promptly, and ensuring proper operation of the mode door motor can help prevent future problems with this component.