AutoCodes – Generic – B2770

B2770 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 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 561

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

What does this mean?

What are the Possible Causes of the DTC B2770?

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?

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 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 code?

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

Need Help with the Code?

Get the B2770 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2770 Nissan — PTC Heater Circuit

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 Code

1. What are the common symptoms of OBDII code B2770 (PTC Heater Circuit)?

Common symptoms of B2770 may include a lack of heat coming from the heater, the heater not working at all, or the heater fan not operating properly.

2. What are some possible causes of OBDII code B2770 (PTC Heater Circuit)?

Possible causes of B2770 include a faulty PTC heater, a blown fuse, a wiring issue, or a malfunctioning heater control module.

3. How can I diagnose OBDII code B2770 (PTC Heater Circuit) at home?

You can diagnose B2770 by checking the fuse related to the PTC heater, inspecting the wiring for any visible damage, and testing the PTC heater for continuity using a multimeter.

4. Is it safe to continue driving with OBDII code B2770 (PTC Heater Circuit) unresolved?

It is generally safe to continue driving with B2770, but you may experience discomfort due to lack of heat in the cabin during cold weather.

5. Can I repair OBDII code B2770 (PTC Heater Circuit) myself?

If you have basic automotive repair knowledge and the necessary tools, you may be able to repair B2770 yourself by replacing the faulty PTC heater or repairing any wiring issues.

6. How much does it typically cost to repair OBDII code B2770 (PTC Heater Circuit) at a mechanic?

The cost of repairing B2770 at a mechanic can vary depending on the exact cause of the issue, but it may range from $100 to $300, including parts and labor.

7. Are there any preventive measures to avoid OBDII code B2770 (PTC Heater Circuit)?

To prevent B2770, you can ensure regular maintenance of your vehicle's heating system, check the heater components during routine inspections, and address any issues promptly.

8. Can OBDII code B2770 (PTC Heater Circuit) affect the overall performance of my vehicle?

While B2770 mainly impacts the heating system, a faulty PTC heater can indirectly affect the overall comfort and usability of your vehicle, especially in cold weather conditions.

9. Is it common for OBDII code B2770 (PTC Heater Circuit) to reoccur after repair?

If the root cause of B2770 is not properly addressed during the repair, there is a chance that the code may reoccur. Thorough diagnosis and repair are essential to prevent recurrence.

10. Does OBDII code B2770 (PTC Heater Circuit) require immediate attention?

While B2770 does not pose an immediate safety risk, it is recommended to address the issue promptly to ensure the proper functioning of your vehicle's heating system, especially in colder climates.