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Engine-Codes – Generic – B2990

B2990 Code - A/C Compressor Driving Circuit

Quick Answer

The B2990 code indicates a problem with the A/C compressor driving circuit in the vehicle. Common causes include Faulty A/C compressor clutch, Damaged wiring or connectors in the A/C compressor circuit, Defective A/C compressor relay. 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
B2990 indicates A/C Compressor Driving Circuit.
Common causes
Common causes include Faulty A/C compressor clutch, Damaged wiring or connectors in the A/C compressor circuit, Defective A/C compressor relay.
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 06, 2024
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Code B2990 Description

The B2990 code indicates a problem with the A/C compressor driving circuit in the vehicle. The A/C compressor is responsible for compressing refrigerant gas and circulating it through the A/C system to cool the interior of the vehicle. When this circuit is not functioning properly, it can lead to a lack of cooling or inconsistent cooling in the vehicle. This can be a significant inconvenience, especially in hot weather conditions.

OBDII Code B2990 - A/C Compressor Driving Circuit
B2990 Code - A/C Compressor Driving Circuit

Common Causes of B2990

  1. Faulty A/C compressor clutch
  2. Damaged wiring or connectors in the A/C compressor circuit
  3. Defective A/C compressor relay
  4. Issues with the HVAC control module
  5. Low refrigerant levels in the A/C system

Symptoms of B2990

  1. Lack of cold air coming from the A/C vents
  2. A/C system blowing hot air intermittently
  3. Unusual noises coming from the A/C compressor
  4. A/C compressor not engaging when the A/C is turned on
  5. A burning smell coming from the A/C system

How to Fix B2990

  1. Begin by diagnosing the specific cause of the issue using a diagnostic tool to pinpoint the problem within the A/C compressor driving circuit.
  2. Inspect the A/C compressor clutch for any signs of damage or wear and replace if necessary.
  3. Check the wiring and connectors in the A/C compressor circuit for any breaks or corrosion and repair or replace as needed.
  4. Test the A/C compressor relay and replace it if it is found to be faulty.
  5. Verify the refrigerant levels in the A/C system and recharge if needed.

Cost to Fix B2990

The cost of repairing the A/C compressor driving circuit can vary depending on the specific cause of the issue and the make and model of the vehicle. On average, the cost of parts and labor for this repair can range from $200 to $500. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate.

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Code B2990 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 B2990 Code

1. What does the OBDII code B2990 mean?

B2990 indicates an issue with the A/C compressor driving circuit, which is responsible for controlling the operation of the air conditioning compressor.

2. What are the common symptoms of code B2990?

Symptoms may include the air conditioning not working, reduced cooling performance, or the A/C compressor not engaging.

3. What causes the B2990 code to appear?

Common causes include a faulty A/C compressor, damaged wiring in the compressor circuit, a defective relay, or an issue with the HVAC control module.

4. How do I diagnose code B2990?

Start by inspecting the A/C compressor wiring and connectors for damage or corrosion. Check the compressor relay and test the circuit for continuity. Scan the HVAC system for additional codes.

5. Can a faulty A/C compressor trigger code B2990?

Yes, a malfunctioning A/C compressor or internal failure can cause this code to appear.

6. Is it safe to drive with code B2990?

Yes, but your air conditioning system may not function properly, which can be uncomfortable in hot weather.

7. How do I fix the B2990 code?

Repairs may include replacing a damaged A/C compressor, fixing or replacing faulty wiring, replacing a defective relay, or reprogramming the HVAC control module.

8. Can a low refrigerant level cause the B2990 code?

While low refrigerant may affect A/C performance, it typically does not directly trigger this code, which is related to the electrical circuit.

9. How much does it cost to repair code B2990?

Repair costs vary depending on the issue, ranging from $50 for simple wiring repairs to $1,000 or more for A/C compressor replacement.

10. Can I clear the B2990 code without fixing the problem?

You can clear the code temporarily, but it will likely return unless the underlying issue is resolved.

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