B0663 - Understanding DTC B0663: Common Issues in 2014-2021 Chevrolet Silverado and GMC Sierra

Quick Answer

B0663 means: DTC B0663 indicates a fault in the refrigerant temperature sensor circuit in the AC system.

Fix: Check and replace faulty components Cost: $120 - $250 Time: 90-180 minutes

Can I drive with B0663? Immediate attention is recommended to avoid further AC system damage.

Common Questions

What does B0663 mean and how does it affect my car?

DTC B0663 indicates a problem with the air conditioning's refrigerant temperature sensor circuit. If not addressed, you may experience poor cooling and increased wear on your AC system components, leading to costly repairs.

What are the most common causes of B0663 and how much does it cost to fix?

The most common causes include a faulty refrigerant temperature sensor, wiring issues, and improper refrigerant levels. Repair costs typically range from $80 to $250 depending on the specific repair needed.

Can I drive my car with B0663 or should I stop immediately?

While you may still be able to drive, it's advised to address the B0663 code as soon as possible. Ignoring it can lead to further damage to your AC system, which could result in higher repair costs.

How can I diagnose B0663 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a quick OBD2 scan to retrieve the B0663 code. Check the freeze frame data to see when the fault occurred, and inspect the refrigerant temperature sensor for visible damage.

What vehicles are most commonly affected by B0663?

DTC B0663 is frequently seen in 2014-2021 Chevrolet Silverado and GMC Sierra models. If you own one of these vehicles, be aware of this code and its potential implications.

How can I prevent B0663 from happening again?

Regular maintenance of your AC system, including checking refrigerant levels and inspecting wiring and connectors, can help prevent the recurrence of B0663. Additionally, using quality parts during repairs can enhance longevity.

What is B0663?

DTC B0663 refers to a fault in the air conditioning system, specifically indicating a problem with the refrigerant temperature sensor circuit. This code is often seen in models like the 2014-2021 Chevrolet Silverado and GMC Sierra. When the Engine Control Module (ECM) detects an inconsistency in the refrigerant temperature sensor input, it triggers this diagnostic trouble code. The refrigerant temperature sensor plays a crucial role in monitoring the refrigerant's temperature within the AC system, which is essential for efficient cooling. If this sensor fails or provides erroneous readings, the AC system may not operate correctly, leading to insufficient cooling or even potential damage to the AC components. Real-world implications of this code include a malfunctioning air conditioning system, which can be particularly frustrating for drivers, especially in hot weather. Ignoring this code can lead to further degradation of the AC system and may result in more costly repairs in the future. It's essential to address this issue promptly to ensure your vehicle's comfort and prevent additional problems down the line.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B0663 is present:

  • Check engine light illuminates, indicating that there is an issue with the air conditioning system.
  • Air conditioning is unable to cool the cabin effectively, leading to discomfort during hot weather.
  • Unusual noises may be heard from the AC compressor, suggesting potential failure of the cooling system components.
  • Increased fuel consumption due to the AC system working harder to maintain cooling levels.
  • Frequent cycling of the AC compressor, which may indicate improper sensor readings.

Possible Causes

Most common causes of B0663 (ordered by frequency):

  1. The most common cause is a faulty refrigerant temperature sensor, which has a likelihood of around 60%. This sensor can wear out over time or get damaged from environmental factors.
  2. Another cause may be wiring issues, including damaged or corroded wiring that affects the sensor's signal. This issue typically accounts for about 25% of cases.
  3. Improper refrigerant levels can also trigger this code; if the system is over or undercharged, it can lead to sensor misreadings. Regular maintenance can help prevent this.
  4. Less common but serious causes include a malfunctioning ECM that misinterprets sensor data, often resulting in a complete AC system failure.
  5. A rare cause could be an obstruction in the AC system, such as a clogged condenser, leading to incorrect temperature readings and triggering the code.

B0663 Repair Costs

Cost Breakdown by Repair Type

Refrigerant Temperature Sensor Replacement

Replacing the faulty refrigerant temperature sensor.

  • Total: $120 - $250
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring in the AC system.

  • Total: $80 - $150
  • Success rate: 85%
Full AC System Inspection

Comprehensive check of the entire AC system to identify underlying issues.

  • Total: $100 - $200
  • Success rate: 95%
Money-Saving Tips for B0663
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional B0663 Diagnosis Process

Follow these systematic steps to accurately diagnose B0663. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion. This should take about 5-10 minutes.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context. Allocate 10-15 minutes for this step.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the refrigerant temperature sensor and associated wiring

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the refrigerant temperature sensor and associated wiring. Expect to spend 20-30 minutes here.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After making repairs, verify proper operation of the AC system and clear codes

Step 4: System function test - After making repairs, verify proper operation of the AC system and clear codes. This step will take around 10-15 minutes.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the AC system operates efficiently

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the AC system operates efficiently. This could take 15-20 minutes.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Refrigerant Temperature Sensor Replacement on a 2016 Chevrolet Silverado

Vehicle: 2016 Chevrolet Silverado, 75,000 miles

Problem: Customer reported that the AC was blowing hot air despite being set to cold.

Diagnosis: After scanning with the GeekOBD APP, DTC B0663 was retrieved. A visual inspection revealed a damaged refrigerant temperature sensor.

Solution: The refrigerant temperature sensor was replaced, and the system was recharged.

Cost: $180 (parts: $60 for the sensor, $120 for labor)

Result: AC system started functioning properly, providing consistent cool air.

Case Study 2: Wiring Repair on a 2018 GMC Sierra

Vehicle: 2018 GMC Sierra, 50,000 miles

Problem: AC system was cycling on and off, and the check engine light was on.

Diagnosis: Diagnostic testing revealed B0663; further inspection showed corroded wiring near the compressor.

Solution: Corroded wiring was repaired, and the system was tested.

Cost: $120 (parts: $30 for wiring, $90 for labor)

Result: The AC system operated without issues post-repair.

Diagnose B0663

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: B0663
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes