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P023B Infiniti Code - Charge Air Cooler Coolant Pump Control Circuit Low

Quick Answer

The P023B code indicates a problem with the Charge Air Cooler (CAC) Coolant Pump Control Circuit, specifically that the circuit is operating at a low voltage or is not functioning as intended. Common causes include Charge Air Cooler (CAC) coolant leakage, leading to insufficient coolant flow, Contaminated coolant, which may cause pump failure or blockage, Electrical issues such as damaged wiring or poor connections in the pump control 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
P023B Infiniti indicates Charge Air Cooler Coolant Pump Control Circuit Low.
Common causes
Common causes include Charge Air Cooler (CAC) coolant leakage, leading to insufficient coolant flow, Contaminated coolant, which may cause pump failure or blockage, Electrical issues such as damaged wiring or poor connections in the pump control 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 Oct 11, 2025
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Code P023B Infiniti Description

The P023B code indicates a problem with the Charge Air Cooler (CAC) Coolant Pump Control Circuit, specifically that the circuit is operating at a low voltage or is not functioning as intended. The Charge Air Cooler Cooling Electric Water Pump plays a crucial role in the vehicle's forced induction system, which includes turbochargers or superchargers. By circulating coolant through the intercooler, it effectively lowers the temperature of the compressed air before it enters the engine. Cooler air is denser, which enhances combustion efficiency, increases power output, and improves overall engine performance. If the CAC coolant pump fails or operates below optimal levels, it can lead to higher intake air temperatures, resulting in reduced engine performance, increased emissions, and potential long-term damage to engine components due to overheating. Ignoring this issue can lead to further complications, such as turbocharger failure, engine knocking, or even complete engine failure, as the engine may not receive the necessary air-fuel mixture for optimal operation. The Electronic Control Module (ECM) monitors the pump's operation and adjusts its speed based on various parameters, including engine load and temperature. A malfunction in this system can trigger the check engine light and may also affect other systems that rely on proper air intake temperatures.
OBDII Code P023B Infiniti - Charge Air Cooler Coolant Pump Control Circuit Low
P023B Infiniti Code - Charge Air Cooler Coolant Pump Control Circuit Low

Common Causes of P023B Infiniti

  1. Charge Air Cooler (CAC) coolant leakage, leading to insufficient coolant flow
  2. Contaminated coolant, which may cause pump failure or blockage
  3. Electrical issues such as damaged wiring or poor connections in the pump control circuit
  4. Faulty Charge Air Cooler Cooling Electric Water Pump, which may not operate at the required speed
  5. ECM software issues or malfunctions affecting pump control

Symptoms of P023B Infiniti

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Reduced engine performance or power loss
  3. Increased turbo lag or sluggish acceleration
  4. Overheating engine or high intake air temperatures
  5. Unusual noises from the engine compartment, particularly near the CAC pump

How to Fix P023B Infiniti

  1. Perform a visual inspection of the CAC pump and associated wiring for damage or corrosion.
  2. Check the coolant level and inspect for any leaks in the cooling system.
  3. Test the Charge Air Cooler Cooling Electric Water Pump to ensure it operates correctly and at the appropriate speed.
  4. Repair or replace any damaged wiring or connectors in the pump control circuit.
  5. Replace the Charge Air Cooler Cooling Electric Water Pump if it is found to be faulty or ineffective.

Cost to Fix P023B Infiniti

The cost to diagnose and repair a P023B code typically ranges from $200 to $600, depending on the specific issue and the required repairs. This estimate includes parts and labor, with parts such as the Charge Air Cooler Cooling Electric Water Pump costing between $100 and $300. Labor costs can vary significantly based on location, vehicle make and model, and shop rates, which generally range from $80 to $150 per hour. Dealerships may charge higher rates, while independent shops may offer more competitive pricing.

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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.

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