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Engine-Codes – Generic – B1946

B1946 Code - Climate Control A/C Post Evaporator Sensor Circuit Failure

Quick Answer

The B1946 diagnostic trouble code (DTC) indicates that there is a failure in the climate control A/C post evaporator sensor circuit. Common causes include Faulty post evaporator sensor, Wiring or connection issues in the sensor circuit, Electrical problems in the climate control system. 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
B1946 indicates Climate Control A/C Post Evaporator Sensor Circuit Failure.
Common causes
Common causes include Faulty post evaporator sensor, Wiring or connection issues in the sensor circuit, Electrical problems in the climate control system.
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 B1946 Description

The B1946 diagnostic trouble code (DTC) indicates that there is a failure in the climate control A/C post evaporator sensor circuit. This sensor is responsible for monitoring the temperature of the air after it passes through the evaporator in the air conditioning system. The information gathered by this sensor is crucial for the proper functioning of the climate control system, as it helps regulate the temperature inside the vehicle.

OBDII Code B1946 - Climate Control A/C Post Evaporator Sensor Circuit Failure
B1946 Code - Climate Control A/C Post Evaporator Sensor Circuit Failure

Common Causes of B1946

  1. Faulty post evaporator sensor
  2. Wiring or connection issues in the sensor circuit
  3. Electrical problems in the climate control system
  4. Corrosion or damage to sensor components
  5. Issues with the climate control module

Symptoms of B1946

  1. Inconsistent temperature regulation in the cabin
  2. The climate control system not responding to temperature adjustments
  3. Reduced cooling or heating performance
  4. Air conditioning system blowing hot air when set to cool
  5. Heater not producing warm air when set to heat

How to Fix B1946

  1. Begin by diagnosing the specific cause of the circuit failure using a scan tool to retrieve the DTC and pinpoint the exact issue.
  2. Inspect the post evaporator sensor and its wiring for any visible damage, corrosion, or loose connections. Replace or repair any damaged components as needed.
  3. Test the sensor circuit to ensure proper voltage and continuity. Repair any electrical issues that may be affecting the circuit.
  4. Clear the DTC from the vehicle's memory using the scan tool and reset the climate control system to ensure the repair was successful.
  5. Test the climate control system to verify that the sensor is now functioning correctly and that the symptoms associated with the B1946 code have been resolved.

Cost to Fix B1946

The typical repair costs for addressing a B1946 code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the parts required for this repair may cost between $50 and $150, while labor costs can range from $100 to $200. It is important to note that these are rough estimates, and actual costs may vary based on factors such as the vehicle make and model, the location of the repair shop, and the hourly labor rates in the area. It is recommended to obtain a detailed quote from a qualified auto repair shop for a more accurate cost estimate.

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Code B1946 Information for Specific Makes

  • B1946 Ford — Climate Control A/C Post Evaporator Sensor Circuit Failure
  • B1946 Lincoln — Climate Control A/C Post Evaporator Sensor Circuit Failure
  • B1946 Mercury — Climate Control A/C Post Evaporator Sensor Circuit Failure
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 B1946 Code

1. What are the common symptoms of OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure?

The common symptoms include a malfunctioning air conditioning system, inconsistent cooling, or complete failure of the A/C system.

2. What are the possible causes of OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure?

Possible causes include a faulty post evaporator sensor, damaged wiring or connectors, issues with the climate control unit, or a problem with the A/C compressor.

3. How can I diagnose OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure?

Diagnosis involves using an OBDII scanner to retrieve the code, conducting a visual inspection of the sensor and its connections, and testing the sensor's resistance with a multimeter.

4. Can I still drive my vehicle with OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure?

It is not recommended to drive with this code present, as it can lead to further damage to the A/C system and discomfort while driving in extreme temperatures.

5. How can I repair OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure?

Repair options include replacing the faulty post evaporator sensor, repairing any damaged wiring or connectors, resetting the climate control unit, and checking the A/C compressor for issues.

6. Are there any DIY tips for fixing OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure?

While some basic diagnostics can be done at home, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair of this code.

7. How much does it cost to repair OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Can a faulty post evaporator sensor cause other issues in the A/C system besides triggering OBDII code B1946?

Yes, a faulty sensor can cause improper cooling, inconsistent temperature regulation, and overall poor performance of the A/C system.

9. How important is it to address OBDII code B1946 related to Climate Control A/C Post Evaporator Sensor Circuit Failure promptly?

It is important to address this code promptly to avoid further damage to the A/C system and ensure comfortable driving conditions, especially in extreme weather.

10. Is it possible for OBDII code B1946 to be a recurring issue even after repair?

It is possible for the code to reappear if the root cause of the problem is not properly diagnosed and fixed, so thorough troubleshooting is essential to prevent recurrence.

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