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P14AC Infiniti Code - Charge Air Cooler Cooling Electric Water Pump

Quick Answer

The P14AC code indicates a malfunction with the Charge Air Cooler (CAC) Cooling Electric Water Pump, which plays a crucial role in maintaining optimal engine performance. Common causes include Charge Air Cooler (CAC) coolant leakage, Charge Air Cooler coolant is mixed in air, Protection control is activated during pump idle running. 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
P14AC Infiniti indicates Charge Air Cooler Cooling Electric Water Pump.
Common causes
Common causes include Charge Air Cooler (CAC) coolant leakage, Charge Air Cooler coolant is mixed in air, Protection control is activated during pump idle running.
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 P14AC Infiniti Description

The P14AC code indicates a malfunction with the Charge Air Cooler (CAC) Cooling Electric Water Pump, which plays a crucial role in maintaining optimal engine performance. This electric pump is responsible for circulating coolant through the intercooler system, effectively lowering the temperature of the air that enters the engine. When the turbocharger or supercharger compresses air, it generates heat, which can lead to a decrease in air density and, consequently, engine performance. By moving coolant between the charge air cooler and a small radiator, the pump helps dissipate this heat, ensuring that the intake air remains cooler and denser. This process not only enhances engine performance and efficiency but also contributes to the longevity and reliability of the engine.
OBDII Code P14AC Infiniti - Charge Air Cooler Cooling Electric Water Pump
P14AC Infiniti Code - Charge Air Cooler Cooling Electric Water Pump

Common Causes of P14AC Infiniti

  1. Charge Air Cooler (CAC) coolant leakage
  2. Charge Air Cooler coolant is mixed in air
  3. Protection control is activated during pump idle running
  4. Faulty Charge Air Cooler Cooling Electric Water Pump
  5. Electrical issues, such as damaged wiring or poor connections

Symptoms of P14AC Infiniti

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Reduced engine performance or power loss
  3. Increased fuel consumption
  4. Overheating engine or coolant temperature warnings
  5. Unusual noises from the engine bay, particularly during acceleration

How to Fix P14AC Infiniti

  1. Perform a diagnostic scan to confirm the P14AC code and check for any related codes.
  2. Inspect the Charge Air Cooler system for visible coolant leaks and check coolant levels.
  3. Test the functionality of the Charge Air Cooler Cooling Electric Water Pump for proper operation.
  4. Examine electrical connections and wiring for damage or corrosion that may affect pump performance.
  5. Replace the faulty pump or repair any leaks and ensure the system is properly bled of air before re-testing.

Cost to Fix P14AC Infiniti

The cost to diagnose and repair issues related to the P14AC code can vary significantly based on the specific problem and the vehicle make and model. Typical parts for a replacement electric water pump can range from $100 to $300, while labor costs may fall between $80 and $150 per hour, depending on the shop's location and expertise. Overall, total repair costs can range from $200 to $600, with dealerships often charging more than independent shops. Always consult with a trusted technician for a precise estimate tailored to your vehicle's needs.

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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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