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Engine-Codes – Generic – P14A5

P14A5 Code - Charge Air Cooler Coolant Pump Control Circuit High

Quick Answer

The diagnostic code P14A5 indicates a problem with the Charge Air Cooler (CAC) Coolant Pump Control Circuit, specifically that the circuit is registering a high voltage condition. Common causes include Charge Air Cooler (CAC) coolant leakage, Faulty Charge Air Cooler Cooling Electric Water Pump, Wiring issues, such as shorts or damaged connectors 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
P14A5 indicates Charge Air Cooler Coolant Pump Control Circuit High.
Common causes
Common causes include Charge Air Cooler (CAC) coolant leakage, Faulty Charge Air Cooler Cooling Electric Water Pump, Wiring issues, such as shorts or damaged connectors 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 P14A5 Description

The diagnostic code P14A5 indicates a problem with the Charge Air Cooler (CAC) Coolant Pump Control Circuit, specifically that the circuit is registering a high voltage condition. The CAC Cooling Electric Water Pump plays a crucial role in maintaining optimal engine performance by circulating coolant through the intercooler system. This process lowers the temperature of the compressed air entering the engine, which is especially important in turbocharged or supercharged vehicles where air temperatures can rise significantly. When the pump operates correctly, it enhances engine efficiency, power output, and reliability by ensuring that the intake air remains cool and dense. If this code is triggered, it often signifies that the pump is either receiving too much voltage or that there is a short circuit in the wiring or connectors associated with the pump. Ignoring this issue can lead to overheating of the intake air, which can cause engine knocking, reduced performance, and potential long-term damage to engine components. Additionally, prolonged operation under these conditions may lead to increased wear on the turbocharger or supercharger, ultimately affecting the vehicle's overall performance and longevity.
OBDII Code P14A5 - Charge Air Cooler Coolant Pump Control Circuit High
P14A5 Code - Charge Air Cooler Coolant Pump Control Circuit High

Common Causes of P14A5

  1. Charge Air Cooler (CAC) coolant leakage
  2. Faulty Charge Air Cooler Cooling Electric Water Pump
  3. Wiring issues, such as shorts or damaged connectors in the pump control circuit
  4. Faulty Engine Control Module (ECM) that mismanages pump operation
  5. Improperly mixed coolant or contamination in the cooling system

Symptoms of P14A5

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased engine performance, especially under load
  3. Increased turbo lag or reduced boost pressure
  4. Unusual engine noises, such as knocking or pinging
  5. Overheating of the engine or coolant system

How to Fix P14A5

  1. Perform a visual inspection of the Charge Air Cooler and associated coolant lines for leaks.
  2. Test the Charge Air Cooler Cooling Electric Water Pump for proper operation and voltage supply.
  3. Inspect the wiring and connectors for damage, corrosion, or shorts that could affect the pump's performance.
  4. Replace the Charge Air Cooler Cooling Electric Water Pump if it is found to be faulty.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure the issue is resolved.

Cost to Fix P14A5

The cost to diagnose and repair a P14A5 code typically ranges from $200 to $600, depending on the specific repairs needed. This estimate includes parts such as the Charge Air Cooler Cooling Electric Water Pump, which can cost between $100 and $300, along with labor charges that generally range from $80 to $150 per hour. Dealerships may charge more, while independent shops might offer lower rates. The final cost can vary based on the vehicle's make and model, as well as the location of the repair shop.

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Code P14A5 Information for Specific Makes

  • P14A5 BMW — Exhaust Gas Temperature Sensor Short Circuit To Earth
  • P14A5 Infiniti — Charge Air Cooler Coolant Pump Control Circuit High
  • P14A5 MINI — Exhaust Gas Temperature Sensor Short Circuit To Earth
  • P14A5 Nissan — Charge Air Cooler Coolant Pump Control Circuit High
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 P14A5 Code

1. What is an OBDII code P14A5?

Code P14A5 indicates a problem with the exhaust gas temperature sensor, specifically a short circuit to earth (ground). This means the sensor or its wiring is accidentally connected to the vehicle’s chassis or another ground source.

2. What symptoms might I notice if my vehicle has the P14A5 code?

Symptoms can include a check engine light, reduced engine performance, increased fuel consumption, and possibly higher emissions. In some cases, the vehicle might enter a limp mode to protect the engine from potential damage.

3. What causes the P14A5 code to appear?

The P14A5 code can be triggered by several issues including damaged wiring to the exhaust gas temperature sensor, a faulty sensor, corrosion at the sensor connection, or problems with the engine control module (ECM).

4. How can I fix the P14A5 error code?

Repairing this code may involve inspecting and repairing or replacing the wiring harness if it’s damaged or shorted, replacing the faulty exhaust gas temperature sensor, cleaning corrosion from connectors, or in rare cases, replacing or reprogramming the ECM.

5. Is it safe to drive with the P14A5 code?

While you might be able to drive with this code active, it is not advisable as it can lead to poorer engine performance and higher emissions. Continued driving could also cause further damage to the engine or exhaust system components.

6. How do I diagnose the problem causing the P14A5 code?

Diagnosis should start with using an OBDII scanner to confirm the code. Inspect the exhaust gas temperature sensor and its connections for visible damage or corrosion. Electrical testing with a multimeter can help determine if there is a short to ground in the circuit.

7. Can a P14A5 code impact the vehicle's fuel economy?

Yes, a malfunctioning exhaust gas temperature sensor can lead to inaccurate readings, which may cause the engine management system to run the engine richer or leaner than necessary, reducing fuel efficiency.

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