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P14A9 Nissan Code - Charge Air Cooler Cooling Electric Water Pump

Quick Answer

The diagnostic code P14A9 refers to an issue 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, leading to insufficient cooling, Contamination of the coolant, such as coolant mixing with air, Protection control activation during pump idle running, indicating a fault. 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
P14A9 Nissan indicates Charge Air Cooler Cooling Electric Water Pump.
Common causes
Common causes include Charge Air Cooler (CAC) coolant leakage, leading to insufficient cooling, Contamination of the coolant, such as coolant mixing with air, Protection control activation during pump idle running, indicating a fault.
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 P14A9 Nissan Description

The diagnostic code P14A9 refers to an issue 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. The process is vital because turbocharged or supercharged engines compress air, which raises its temperature. By cooling this air before it enters the combustion chamber, the pump ensures that the air remains denser, allowing for better combustion efficiency and improved engine performance. If the CAC Cooling Electric Water Pump fails or operates inefficiently, it can lead to higher intake air temperatures, resulting in reduced engine power, increased fuel consumption, and potential long-term damage to engine components due to overheating. Ignoring this issue can lead to more severe problems, such as engine knocking, reduced turbocharger efficiency, and even engine failure. The pump is controlled by the Engine Control Module (ECM), which adjusts its operation based on various parameters, including engine load and temperature. A malfunction can trigger the check engine light and may also affect other systems that rely on proper air intake temperatures, such as the vehicle's emission control systems.
OBDII Code P14A9 Nissan - Charge Air Cooler Cooling Electric Water Pump
P14A9 Nissan Code - Charge Air Cooler Cooling Electric Water Pump

Common Causes of P14A9 Nissan

  1. Charge Air Cooler (CAC) coolant leakage, leading to insufficient cooling
  2. Contamination of the coolant, such as coolant mixing with air
  3. Protection control activation during pump idle running, indicating a fault
  4. Faulty Charge Air Cooler Cooling Electric Water Pump, which may fail to circulate coolant effectively
  5. Electrical issues, such as wiring problems or a malfunctioning ECM

Symptoms of P14A9 Nissan

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Reduced engine power or sluggish acceleration
  3. Increased engine temperature readings
  4. Unusual noises from the engine bay, particularly when the pump is operating
  5. Poor fuel economy or increased emissions

How to Fix P14A9 Nissan

  1. Perform a diagnostic scan to confirm the P14A9 code and check for any related codes.
  2. Inspect the Charge Air Cooler system for leaks, ensuring that all hoses and connections are secure.
  3. Test the functionality of the Charge Air Cooler Cooling Electric Water Pump to determine if it operates correctly.
  4. Replace any faulty components, including the pump or damaged hoses, as necessary.
  5. Clear the diagnostic codes and conduct a road test to ensure the issue is resolved and monitor for any reoccurrence.

Cost to Fix P14A9 Nissan

The cost to repair issues related to the P14A9 code can vary significantly based on the specific problem and the vehicle make and model. Typically, parts such as the Charge Air Cooler Cooling 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, you might expect a total repair cost ranging from $200 to $600, with dealerships often charging more than independent shops.

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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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