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Engine-Codes – Generic – P14A6

P14A6 Code - Charge Air Cooler Cooling Electric Water Pump

Quick Answer

The P14A6 code indicates an issue with the Charge Air Cooler (CAC) Cooling Electric Water Pump, which plays a critical role in the vehicle's forced induction system. Common causes include Charge Air Cooler (CAC) coolant leakage, leading to insufficient coolant flow, Contaminated coolant, which can cause pump failure or inefficiency, Electrical issues, such as a faulty wiring harness or connector related to the pump. 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
P14A6 indicates Charge Air Cooler Cooling Electric Water Pump.
Common causes
Common causes include Charge Air Cooler (CAC) coolant leakage, leading to insufficient coolant flow, Contaminated coolant, which can cause pump failure or inefficiency, Electrical issues, such as a faulty wiring harness or connector related to the pump.
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 P14A6 Description

The P14A6 code indicates an issue with the Charge Air Cooler (CAC) Cooling Electric Water Pump, which plays a critical role in the vehicle's forced induction system. This pump is responsible for circulating coolant through the intercooler, which cools the compressed air generated by the turbocharger or supercharger before it enters the engine. By maintaining a lower temperature of the intake air, the pump enhances air density, leading to improved combustion efficiency, increased power output, and better overall engine performance. The electric water pump operates under the control of the Engine Control Module (ECM), which adjusts its speed based on various parameters such as engine load, coolant temperature, and ambient conditions. If the P14A6 code is triggered, it may indicate that the pump is malfunctioning, leading to inadequate cooling of the intake air. Ignoring this issue can result in elevated intake air temperatures, which may cause engine knocking, reduced performance, and potential long-term damage to engine components. Over time, excessive heat can lead to premature wear of the turbocharger or supercharger, decreased fuel efficiency, and increased emissions. Therefore, addressing the P14A6 code promptly is essential for maintaining optimal engine performance and longevity.
OBDII Code P14A6 - Charge Air Cooler Cooling Electric Water Pump
P14A6 Code - Charge Air Cooler Cooling Electric Water Pump

Common Causes of P14A6

  1. Charge Air Cooler (CAC) coolant leakage, leading to insufficient coolant flow
  2. Contaminated coolant, which can cause pump failure or inefficiency
  3. Electrical issues, such as a faulty wiring harness or connector related to the pump
  4. Malfunctioning Charge Air Cooler Cooling Electric Water Pump
  5. Faulty Engine Control Module (ECM) programming or failure affecting pump operation

Symptoms of P14A6

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Reduced engine performance or power loss during acceleration
  3. Increased intake air temperatures, leading to potential engine knocking
  4. Unusual noises from the engine bay, particularly from the pump area
  5. Coolant leaks around the Charge Air Cooler or associated components

How to Fix P14A6

  1. Perform a diagnostic scan to confirm the P14A6 code and check for any related codes.
  2. Inspect the Charge Air Cooler and associated hoses for leaks or damage.
  3. Test the electrical connections and wiring to the electric water pump for continuity and proper voltage.
  4. Replace the Charge Air Cooler Cooling Electric Water Pump if it is found to be faulty.
  5. Flush and replace the coolant if contamination is detected, ensuring proper coolant levels are maintained.

Cost to Fix P14A6

The cost to diagnose and repair the P14A6 code typically ranges from $300 to $800, depending on the specific issue and the vehicle make and model. Parts such as the electric water pump can cost between $150 and $400, while labor costs can vary significantly based on the shop's hourly rate, which generally falls between $80 and $150 per hour. Dealerships may charge more, while independent shops might offer lower rates. Always consider local labor rates and the complexity of the repair when estimating total costs.

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Code P14A6 Information for Specific Makes

  • P14A6 BMW — Diesel Particulate Filter System Flow Resistance Too Low
  • P14A6 Infiniti — Charge Air Cooler Cooling Electric Water Pump
  • P14A6 MINI — Diesel Particulate Filter System Flow Resistance Too Low
  • P14A6 Nissan — Charge Air Cooler Cooling Electric Water Pump
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 P14A6 Code

1. What are the common symptoms of OBDII code P14A6 (Diesel Particulate Filter System Flow Resistance Too Low)?

The common symptoms of code P14A6 may include decreased engine performance, reduced fuel efficiency, excessive exhaust smoke, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P14A6?

Potential causes of code P14A6 include a faulty diesel particulate filter (DPF), clogged DPF, exhaust system leaks, malfunctioning sensors, or issues with the engine's exhaust gas recirculation (EGR) system.

3. How can I diagnose the cause of OBDII code P14A6?

Diagnosing code P14A6 typically involves using an OBDII scanner to retrieve the fault code, conducting a visual inspection of the DPF and exhaust system, checking sensors and related components for proper functioning, and performing a backpressure test on the DPF.

4. What are the repair options for OBDII code P14A6?

Repair options for code P14A6 may include cleaning or replacing the DPF, repairing exhaust leaks, replacing faulty sensors, cleaning the EGR system, or addressing any other underlying issues contributing to the low flow resistance in the DPF system.

5. Can I continue driving my vehicle with OBDII code P14A6?

It is not recommended to continue driving your vehicle with code P14A6 present, as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly to ensure proper vehicle performance and compliance with emissions regulations.

6. How can I prevent OBDII code P14A6 from recurring?

To prevent code P14A6 from recurring, it is essential to perform regular maintenance on your vehicle, including following the manufacturer's recommended service intervals for the DPF system, using high-quality diesel fuel, and driving your vehicle under conditions that promote proper DPF regeneration.

7. Is it possible to clear OBDII code P14A6 without making repairs?

While you can clear the fault code temporarily using an OBDII scanner, it is not recommended to do so without addressing the underlying issue causing code P14A6. Ignoring the problem can lead to more severe damage and potentially costly repairs down the line.

8. How long does it take to repair OBDII code P14A6?

The time it takes to repair code P14A6 can vary depending on the specific cause of the issue and the extent of the repairs needed. Simple fixes like sensor replacement may take a few hours, while more complex repairs like DPF replacement could take longer.

9. Can I reset the check engine light after repairing OBDII code P14A6?

After repairing code P14A6, you can reset the check engine light using an OBDII scanner to clear the fault code. Once the repair is completed, resetting the light will allow you to monitor the system for any new issues that may arise.

10. Do I need a professional mechanic to repair OBDII code P14A6?

While some minor repairs related to code P14A6 can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair of the diesel particulate filter system flow resistance too low issue to ensure comprehensive and lasting solutions.

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