AutoCodes – Nissan – B2773 Nissan

B2773 Nissan 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 Nissan 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 2,643

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 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 (PTC 1) malfunction is detected.

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

What does this mean?

What are the Possible Causes of the DTC B2773 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 B2773 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 B2773 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 B2773 Nissan Code

1. What does the OBDII code B2773 mean on a Nissan?

B2773 indicates a fault in the PTC (Positive Temperature Coefficient) Heater Circuit 1, which helps warm the cabin quickly in cold weather.

2. What are the common symptoms of the B2773 code in a Nissan?

Symptoms may include poor cabin heating, the malfunction indicator light (MIL) or check engine light turning on, and reduced HVAC system efficiency.

3. What causes the B2773 code in a Nissan?

Common causes include a faulty PTC heater, damaged wiring or connectors in the circuit, or a malfunctioning HVAC control module.

4. How can I diagnose the B2773 code on my Nissan?

Start by checking the PTC heater circuit wiring and connectors for damage, then use a multimeter to test for proper voltage and resistance in the circuit.

5. Can a bad PTC heater trigger the B2773 code?

Yes, a faulty or shorted PTC heater can be a primary cause of the B2773 code.

6. Is the B2773 code serious in a Nissan?

While it wonâ€™t affect engine performance, the issue may prevent proper cabin heating, which could be inconvenient or unsafe in cold weather.

7. How do I fix the B2773 code on a Nissan?

Repairs may include replacing the PTC heater, repairing damaged wiring or connectors, or reprogramming or replacing the HVAC control module if needed.

8. Can I clear the B2773 code without fixing the problem?

You can clear the code with an OBDII scanner, but it will likely return if the underlying issue isnâ€™t resolved.

9. What tools are needed to troubleshoot the B2773 code?

Youâ€™ll need an OBDII scanner, a multimeter, and possibly wiring diagrams for your Nissan model to diagnose and repair the issue.

10. How much does it cost to fix the B2773 code on a Nissan?

Costs vary depending on the exact cause, but repairs can range from $50 for simple wiring fixes to $500 or more for PTC heater replacement or HVAC module repairs.