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Engine-Codes – Generic – B1966

B1966 Code - A/C Post Heater Sensor Circuit Failure

Quick Answer

The B1966 diagnostic trouble code indicates an issue with the A/C post heater sensor circuit in the vehicle's air conditioning system. Common causes include Faulty A/C post heater sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris in the sensor circuit. 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
B1966 indicates A/C Post Heater Sensor Circuit Failure.
Common causes
Common causes include Faulty A/C post heater sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris in the sensor circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code B1966 Description

The B1966 diagnostic trouble code indicates an issue with the A/C post heater sensor circuit in the vehicle's air conditioning system. This sensor is responsible for monitoring the temperature of the air after it has passed through the heater core, ensuring that the air conditioning system is functioning properly. When this sensor circuit fails, it can lead to a variety of issues with the vehicle's A/C system, impacting the overall comfort and functionality of the cabin climate control.

OBDII Code B1966 - A/C Post Heater Sensor Circuit Failure
B1966 Code - A/C Post Heater Sensor Circuit Failure

Common Causes of B1966

  1. Faulty A/C post heater sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or debris in the sensor circuit
  4. Electrical issues in the A/C system
  5. Malfunctioning HVAC control module

Symptoms of B1966

  1. Inconsistent cooling or heating of the cabin
  2. A/C system blowing warm air
  3. Reduced airflow from the vents
  4. A/C system not responding to temperature adjustments
  5. Illumination of the check engine light

How to Fix B1966

  1. Diagnose the issue by using a scan tool to retrieve the B1966 code and inspect the A/C post heater sensor circuit for any visible damage.
  2. Test the A/C post heater sensor for proper functionality using a multimeter to check for continuity and resistance.
  3. Inspect and repair any damaged wiring or connectors in the sensor circuit.
  4. Clear the diagnostic trouble codes from the vehicle's computer and reset the A/C system to ensure proper operation.
  5. Test drive the vehicle to confirm that the A/C system is functioning correctly and that the B1966 code does not reappear.

Cost to Fix B1966

The typical repair costs for addressing an A/C post heater sensor circuit failure can vary depending on the extent of the issue and the specific components that require replacement or repair. In general, the parts needed for this repair, such as a new A/C post heater sensor or wiring connectors, may cost between $50 to $150. Additionally, labor costs can range from $100 to $300, depending on the hourly rates of the auto repair shop and the complexity of the repair process.

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Code B1966 Information for Specific Makes

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 B1966 Code

1. What are the common symptoms of OBDII code B1966 (A/C Post Heater Sensor Circuit Failure)?

- Common symptoms include the air conditioning system not working properly, inconsistent temperature control, and possible heater malfunctions.

2. What can cause the OBDII code B1966 to trigger?

- The A/C Post Heater Sensor Circuit Failure code may be triggered by issues such as a faulty heater sensor, wiring problems, or a malfunctioning control module.

3. How can I diagnose the A/C Post Heater Sensor Circuit Failure related to code B1966?

- Diagnosis typically involves using a scan tool to retrieve the specific code, checking the heater sensor's resistance, inspecting the wiring for any damage, and testing the control module.

4. What are the repair options for fixing OBDII code B1966?

- Repair options may include replacing the faulty heater sensor, repairing or replacing damaged wiring, or reprogramming the control module.

5. Can I drive my vehicle with the OBDII code B1966 present?

- It is not recommended to drive with the A/C Post Heater Sensor Circuit Failure code active, as it can lead to further damage to the air conditioning system.

6. How much does it cost to repair OBDII code B1966?

- The cost of repairing this code can vary depending on the extent of the issue, the parts required, and the labor rates of the repair shop. It is advisable to get a few quotes from different mechanics.

7. Are there any preventive measures to avoid OBDII code B1966?

- Regular maintenance of the air conditioning system, checking for any unusual symptoms, and addressing any issues promptly can help prevent the occurrence of this code.

8. Can a DIY enthusiast fix OBDII code B1966 at home?

- While some basic troubleshooting steps can be performed at home, diagnosing and repairing the A/C Post Heater Sensor Circuit Failure may require specialized tools and expertise, so it's often best left to professionals.

9. How long does it take to repair OBDII code B1966?

- The repair time for this code can vary depending on the exact cause of the issue, the availability of parts, and the expertise of the technician. It's advisable to consult with the repair shop for an estimate.

10. Will resetting the OBDII code B1966 make it go away permanently?

- Resetting the code without addressing the underlying issue will not solve the problem permanently. It is important to diagnose and repair the root cause to prevent the code from reoccurring.

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