AutoCodes – Nissan – B2771 Nissan

B2771 Nissan Code - PTC Heater Overheat Protect

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: B2771 Nissan indicates PTC Heater Overheat Protect.
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 687

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 B2771 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 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 the PTC heater circuit board internal temperature is 115°C (239°F) or more.

OBDII Code B2771 Nissan - PTC Heater Overheat Protect - AutoCodes.com — B2771 Nissan Code - PTC Heater Overheat Protect

What does this mean?

What are the Possible Causes of the DTC B2771 Nissan?

Faulty Positive Temperature Coefficient (PTC) Heater
PTC Heater harness is open or shorted
PTC Heater circuit poor electrical connection

How to Fix the DTC B2771 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 B2771 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 B2771 Nissan Code

1. What are the common symptoms of OBDII code B2771 Nissan (PTC Heater Overheat Protect)?

- The common symptoms include the heater not working properly, the engine overheating, and the Check Engine light illuminating.

2. What causes the OBDII code B2771 Nissan (PTC Heater Overheat Protect) to trigger?

- The code is triggered when the PTC (Positive Temperature Coefficient) heater overheat protection system detects excessive heat in the heater circuit.

3. How can I diagnose the OBDII code B2771 Nissan (PTC Heater Overheat Protect)?

- Diagnosis involves checking the PTC heater circuit for any shorts, open circuits, or other electrical faults using a multimeter and diagnostic tools.

4. What are some repair tips for fixing OBDII code B2771 Nissan (PTC Heater Overheat Protect)?

- Repair tips include checking the PTC heater wiring for damage, replacing any faulty components, and clearing the code with a diagnostic tool after repairs are completed.

5. Can I drive my vehicle with the OBDII code B2771 Nissan (PTC Heater Overheat Protect) present?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the heater system and potentially cause overheating issues.

6. How important is it to address the OBDII code B2771 Nissan (PTC Heater Overheat Protect) promptly?

- It is important to address the code promptly to prevent any potential damage to the heating system and ensure the vehicle operates safely and efficiently.

7. Is it possible to reset the OBDII code B2771 Nissan (PTC Heater Overheat Protect) without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear if the underlying issue causing the overheat protection activation is not resolved.

8. Can extreme weather conditions contribute to triggering the OBDII code B2771 Nissan (PTC Heater Overheat Protect)?

- Yes, extreme cold or hot weather conditions can sometimes lead to the PTC heater overheat protection system activating and triggering the code.

9. How can I prevent OBDII code B2771 Nissan (PTC Heater Overheat Protect) from recurring?

- Regular maintenance of the heating system, checking for any wiring issues, and addressing any overheating problems promptly can help prevent the code from recurring.

10. Are there any recalls or technical service bulletins related to OBDII code B2771 Nissan (PTC Heater Overheat Protect)?

- It is recommended to check with Nissan dealership or official sources for any recalls or technical service bulletins related to this specific OBDII code.