AutoCodes – Nissan – B2770 Nissan

B2770 Nissan Code - PTC Heater Circuit

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: B2770 Nissan indicates PTC Heater Circuit.
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 2,808

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 B2770 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 system malfunction is detected.

OBDII Code B2770 Nissan - PTC Heater Circuit - AutoCodes.com — B2770 Nissan Code - PTC Heater Circuit

What does this mean?

What are the Possible Causes of the DTC B2770 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 B2770 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 B2770 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.

Need more information about the B2770 Nissan code?

Need more information on how to fix the B2770 Nissan code? Get Access to Factory Service Manuals

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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 B2770 Nissan Code

1. What are the common symptoms of OBDII code B2770 on a Nissan related to the PTC Heater Circuit?

The common symptoms include the heater not functioning properly, lack of warm air in the cabin, and potential issues with defrosting the windshield.

2. What typically causes the OBDII code B2770 related to the PTC Heater Circuit in a Nissan?

The code is usually triggered by a malfunction in the PTC (Positive Temperature Coefficient) heater circuit, which can be caused by wiring faults, a faulty PTC heater, or a defective control module.

3. How can I diagnose the PTC Heater Circuit issue triggering OBDII code B2770 on my Nissan?

To diagnose the problem, you can use a multimeter to test the continuity of the PTC heater, inspect the wiring for any damage, and check the control module for proper operation.

4. What is the recommended repair approach for fixing OBDII code B2770 on a Nissan due to the PTC Heater Circuit issue?

The repair process usually involves repairing or replacing any damaged wiring, testing and replacing the PTC heater if necessary, and resetting the fault code with an OBDII scanner.

5. Can a DIY enthusiast fix the OBDII code B2770 related to the PTC Heater Circuit in a Nissan?

While some DIY enthusiasts with automotive repair experience may be able to diagnose and repair this issue, it is recommended to consult a professional mechanic for an accurate diagnosis and safe repair.

6. Is it safe to continue driving my Nissan with the OBDII code B2770 triggered by the PTC Heater Circuit issue?

It is not recommended to drive the vehicle with this issue, especially in cold weather, as it can affect the overall performance of the heating system and compromise visibility through the windshield.

7. How much does it typically cost to repair the OBDII code B2770 on a Nissan caused by the PTC Heater Circuit malfunction?

The cost of repairing this issue can vary depending on the extent of the problem, the need for replacement parts, and labor rates, but it is advisable to get a few quotes from reputable repair shops.

8. Can a faulty PTC Heater Circuit trigger other OBDII codes in a Nissan?

While the PTC Heater Circuit issue typically triggers the B2770 code, it is possible for related faults to trigger additional codes, so a comprehensive diagnostic scan is recommended.

9. Are there any preventive maintenance tips to avoid OBDII code B2770 related to the PTC Heater Circuit in a Nissan?

Regularly checking the heating system, inspecting wiring for damage, and addressing any heating issues promptly can help prevent the occurrence of this code.

10. How long does it typically take to repair the OBDII code B2770 related to the PTC Heater Circuit in a Nissan?

The repair time can vary based on the complexity of the issue, availability of parts, and the mechanic's expertise, but it is advisable to inquire about the estimated repair time before proceeding with the fix.