AutoCodes – Generic – B2773

B2773 Code - PTC Heater Circuit 1

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: B2773 indicates PTC Heater Circuit 1.
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 727

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 B2773 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 (PTC 1) malfunction is detected.

OBDII Code B2773 - PTC Heater Circuit 1 - AutoCodes.com — B2773 Code - PTC Heater Circuit 1

What does this mean?

What are the Possible Causes of the DTC B2773?

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

How to Fix the DTC B2773?

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 B2773 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 B2773 code?

Need more information on how to fix the B2773 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2773 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2773 Nissan — PTC Heater Circuit 1

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 B2773 Code

1. What are common symptoms of OBDII code B2773 (PTC Heater Circuit 1)?

- Common symptoms include issues with the vehicle's heating system, such as a lack of heat from the heater or inconsistent heat levels.

2. What are the possible causes of OBDII code B2773?

- Possible causes of this code include a faulty PTC (Positive Temperature Coefficient) heater, damaged wiring or connectors in the heater circuit, or a malfunctioning heater control module.

3. How can I diagnose the PTC Heater Circuit 1 issue?

- Diagnosis involves using a scan tool to retrieve the OBDII code, inspecting the PTC heater and associated wiring for damage, and testing the heater's resistance to determine if it is functioning properly.

4. Can I drive my vehicle with OBDII code B2773 present?

- It is generally not recommended to drive with this code present, as it can affect the vehicle's heating system and potentially lead to further problems if left unresolved.

5. How do I repair OBDII code B2773?

- Repairing this code may involve replacing the faulty PTC heater, repairing or replacing damaged wiring or connectors, or resetting the heater control module after addressing any underlying issues.

6. Is OBDII code B2773 a serious issue?

- While it may not cause immediate harm to the vehicle, ignoring this code can result in discomfort due to heating system malfunctions and may lead to more severe problems over time.

7. Can a DIY enthusiast fix OBDII code B2773 at home?

- Depending on your skill level and access to tools, it may be possible to address this code at home by following repair guides, but professional assistance is recommended for accurate diagnosis and repair.

8. How much does it typically cost to repair OBDII code B2773?

- The cost of repairing this code can vary depending on the underlying issue, but it may involve parts and labor expenses ranging from $100 to $500 or more, depending on the extent of the repairs needed.

9. Are there any preventive measures to avoid OBDII code B2773 in the future?

- Regular maintenance of the vehicle's heating system, including checking for any signs of issues with the PTC heater and associated components, can help prevent the occurrence of this code in the future.

10. Will resetting the OBDII code B2773 resolve the issue?

- While resetting the code may temporarily clear the error message, it will not fix the underlying problem causing OBDII code B2773. It is essential to diagnose and address the root cause of the issue for a lasting repair.