AutoCodes – Nissan – B27A9 Nissan

B27A9 Nissan 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: B27A9 Nissan 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 1,004

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 B27A9 Nissan 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 4.

OBDII Code B27A9 Nissan - Mode Door Motor - AutoCodes.com — B27A9 Nissan Code - Mode Door Motor

What does this mean?

What are the Possible Causes of the DTC B27A9 Nissan?

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 B27A9 Nissan?

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 B27A9 Nissan 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 B27A9 Nissan Code

1. What are the common symptoms of OBDII code B27A9 in a Nissan related to the Mode Door Motor?

The common symptoms include inconsistent air distribution from the vents, unusual clicking or tapping noises from the dashboard, and the inability to adjust the temperature properly.

2. What usually causes the OBDII code B27A9 related to the Mode Door Motor in a Nissan?

The code B27A9 is typically triggered by a malfunction in the mode door motor, which controls the direction of airflow in the HVAC system.

3. How can I diagnose the issue causing OBDII code B27A9 in my Nissan related to the Mode Door Motor?

Diagnosing the issue involves checking the mode door motor for proper operation, inspecting the HVAC system for any blockages or obstructions, and using a diagnostic scanner to read the trouble codes.

4. Can I repair the Mode Door Motor issue triggering OBDII code B27A9 in my Nissan myself?

While some DIY enthusiasts may attempt to replace the mode door motor, it is recommended to consult a professional mechanic or dealership due to the complexity of accessing and replacing the motor.

5. Are there any temporary fixes I can try for OBDII code B27A9 in my Nissan related to the Mode Door Motor?

You may try resetting the HVAC system by disconnecting the car battery for a few minutes, which can sometimes clear the code temporarily. However, a permanent solution will require addressing the mode door motor issue.

6. Is it safe to continue driving my Nissan with OBDII code B27A9 related to the Mode Door Motor?

It is generally safe to drive the vehicle with this code, but you may experience discomfort due to improper airflow distribution and temperature control. Getting the issue fixed promptly is recommended.

7. How much does it typically cost to repair the Mode Door Motor issue causing OBDII code B27A9 in a Nissan?

The cost of repair can vary depending on the labor rates and the specific components that need to be replaced. Expect to pay a few hundred dollars for parts and labor.

8. Will the OBDII code B27A9 related to the Mode Door Motor cause my Nissan to fail an emissions test?

The code B27A9 is related to the HVAC system and should not affect the emissions output of the vehicle. It should not cause your Nissan to fail an emissions test.

9. Can extreme temperatures or weather conditions trigger OBDII code B27A9 in a Nissan related to the Mode Door Motor?

Extreme temperatures or weather conditions can exacerbate existing issues with the mode door motor, leading to the triggering of the code B27A9. Proper maintenance and care can help prevent such occurrences.

10. How long does it typically take to repair the Mode Door Motor issue causing OBDII code B27A9 in a Nissan?

The repair time can vary depending on the accessibility of the mode door motor and any other related components that need attention. It may take a few hours to a full day for a mechanic to complete the repair.