AutoCodes – Nissan – B277B Nissan

B277B Nissan Code - HVAC LIN Communication

Quick Answer

A Positive Temperature Coefficient (PTC) heater is used as the heat source for heating. Common causes include Faulty Positive Temperature Coefficient (PTC) Heater, PTC Heater harness is open or shorted, PTC Heater 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: B277B Nissan indicates HVAC LIN Communication.
Common causes: Common causes include Faulty Positive Temperature Coefficient (PTC) Heater, PTC Heater harness is open or shorted, PTC Heater 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 873

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 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B277B Nissan Description

A Positive Temperature Coefficient (PTC) heater is used as the heat source for heating. The PTC is a ceramic material with barium titanate as the primary component. The PTC heater provides an internal control circuit and performs Local Interconnect Network (LIN) communication with A/C Auto Amplifier. Based on the signals from A/C Auto Amplifier, the microcomputer inside PTC heater controls the heater output by PWM. When current is applied, it heats up. Upon reaching a certain temperature (Curie temperature) the resistance suddenly increases, limiting the current, and maintaining a constant amount of heating. The Diagnostic Trouble Code (DTC) sets when there is an error in the signal send from the A/C Auto Amplifier.

OBDII Code B277B Nissan - HVAC LIN Communication - AutoCodes.com — B277B Nissan Code - HVAC LIN Communication

What does this mean?

What are the Possible Causes of the DTC B277B Nissan?

Faulty Positive Temperature Coefficient (PTC) Heater
PTC Heater harness is open or shorted
PTC Heater circuit poor electrical connection
Faulty A/C Auto Amplifier

How to Fix the DTC B277B 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 B277B 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 B277B Nissan Code

1. What are the common symptoms of OBDII code B277B in a Nissan related to HVAC LIN Communication?

The common symptoms include issues with the heating, ventilation, and air conditioning system such as lack of airflow, inconsistent temperature control, and non-functional HVAC controls.

2. What are the possible causes of OBDII code B277B in a Nissan?

Possible causes of this code include damaged wiring in the HVAC LIN communication circuit, a faulty HVAC control module, or a malfunctioning LIN bus network.

3. How can I diagnose the OBDII code B277B related to HVAC LIN Communication in my Nissan?

Diagnosing this code typically involves using a scan tool to retrieve the specific diagnostic trouble code, checking the HVAC system components for any visible damage, and performing a thorough inspection of the LIN communication network.

4. Can a DIY enthusiast repair OBDII code B277B in a Nissan related to HVAC LIN Communication?

While some basic troubleshooting steps can be performed by a DIY enthusiast, repairing this code often requires advanced diagnostic tools and expertise. It is recommended to seek assistance from a professional mechanic for a proper diagnosis and repair.

5. What are some tips for repairing OBDII code B277B in a Nissan associated with HVAC LIN Communication?

Repair tips may include checking and repairing any damaged wiring in the LIN communication circuit, replacing a faulty HVAC control module, and ensuring proper communication within the LIN bus network.

6. Is it safe to continue driving my Nissan with OBDII code B277B related to HVAC LIN Communication?

It is not recommended to drive the vehicle with unresolved OBDII codes, as they can indicate underlying issues that may affect the vehicle's performance and safety. It is advisable to address the problem promptly.

7. How much does it typically cost to repair OBDII code B277B in a Nissan involving HVAC LIN Communication?

The cost of repairing this code can vary depending on the specific issue causing the fault. Repair costs may include parts replacement, labor charges, and diagnostic fees. It is best to consult with a mechanic for an accurate estimate.

8. Can resetting the OBDII code B277B in a Nissan fix the issue related to HVAC LIN Communication?

Resetting the code may temporarily clear the fault, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and repair the root cause of the problem to resolve it permanently.

9. Are there any recalls or technical service bulletins related to OBDII code B277B in Nissan vehicles concerning HVAC LIN Communication?

It is recommended to check with Nissan dealerships or online resources for any recalls or technical service bulletins related to this particular OBDII code. Manufacturers may provide relevant information for specific vehicle models.

10. How can I prevent OBDII code B277B from appearing in my Nissan due to HVAC LIN Communication issues?

Regular maintenance of your vehicle's HVAC system, including checking for any wiring damage and ensuring proper communication on the LIN bus network, can help prevent the occurrence of this OBDII code.