AutoCodes – Generic – B2772

B2772 Code - PTC Heater Voltage

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: B2772 indicates PTC Heater Voltage.
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 1,548

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 B2772 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 supply voltage input to the PTC heater is the specified voltage value or less.

OBDII Code B2772 - PTC Heater Voltage - AutoCodes.com — B2772 Code - PTC Heater Voltage

What does this mean?

What are the Possible Causes of the DTC B2772?

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

How to Fix the DTC B2772?

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 B2772 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 B2772 code?

Need more information on how to fix the B2772 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2772 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2772 Nissan — PTC Heater Voltage

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 B2772 Code

1. What are the common symptoms of OBDII code B2772 (PTC Heater Voltage)?

- Common symptoms include a lack of heat from the heater, reduced defrosting capabilities, and potential issues with the vehicle's climate control system.

2. What are the possible causes of OBDII code B2772?

- The code B2772 is typically triggered by a faulty PTC (Positive Temperature Coefficient) heater, damaged wiring or connectors, or a malfunction in the climate control system.

3. How can I diagnose the issue related to OBDII code B2772?

- To diagnose the issue, you may need to inspect the PTC heater, check for any damaged wiring or connectors, and use a diagnostic tool to analyze the climate control system.

4. Can I continue driving my vehicle with OBDII code B2772?

- It is not recommended to drive the vehicle with code B2772 as it can lead to inadequate heating, defrosting issues, and potential complications with the climate control system.

5. How can I repair OBDII code B2772 (PTC Heater Voltage) myself?

- Repairing code B2772 may involve replacing the faulty PTC heater, repairing damaged wiring or connectors, or addressing any issues with the climate control system. It is recommended to consult a professional if you are not experienced in automotive repairs.

6. Is it necessary to reset the OBDII code B2772 after making repairs?

- Yes, it is important to reset the OBDII code B2772 after making repairs to clear the fault code and ensure the issue has been resolved. This can be done using an OBDII scanner or by disconnecting the battery for a few minutes.

7. Can extreme weather conditions affect the likelihood of OBDII code B2772 being triggered?

- Yes, extreme weather conditions can potentially impact the PTC heater's performance, wiring, and connectors, increasing the likelihood of triggering code B2772.

8. How can I prevent OBDII code B2772 from occurring in the future?

- To prevent code B2772, it is important to regularly maintain your vehicle's heating system, inspect wiring and connectors for any damage, and address any climate control system issues promptly.

9. Does OBDII code B2772 affect the overall performance of the vehicle?

- While code B2772 specifically relates to the PTC heater voltage, it can indirectly affect the vehicle's performance by impacting heating capabilities and overall comfort for the driver and passengers.

10. Are there any recalls or manufacturer bulletins related to OBDII code B2772?

- It is recommended to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to OBDII code B2772 to see if there are known issues or remedies provided by the manufacturer.