AutoCodes – Generic – P14AC

P14AC Code - Charge Air Cooler Cooling Electric Water Pump

Quick Answer

The Charge Air Cooler (CAC) Cooling Electric Water Pump is an electric pump that circulates coolant through the intercooler system to lower the temperature of the air entering the engine. 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 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.

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Code Popularity 98

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 11, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P14AC Description

The Charge Air Cooler (CAC) Cooling Electric Water Pump is an electric pump that circulates coolant through the intercooler system to lower the temperature of the air entering the engine. By moving coolant between the charge air cooler and a small radiator, it helps remove heat from the compressed intake air produced by the turbocharger or supercharger. This keeps the intake air cooler and denser, improving engine performance, efficiency, and reliability. The pump is controlled by the ECM and adjusts its speed based on engine load and temperature conditions.

OBDII Code P14AC - Charge Air Cooler Cooling Electric Water Pump - AutoCodes.com — P14AC Code - Charge Air Cooler Cooling Electric Water Pump

What does this mean?

What are the Possible Causes of the DTC P14AC?

Charge Air Cooler (CAC) coolant leakage
Charge Air Cooler coolant is mixed in air
Protection control is activated during pump idle running
Faulty Charge Air Cooler Cooling Electric Water Pump

How to Fix the DTC P14AC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P14AC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P14AC code?

Need more information on how to fix the P14AC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P14AC Infiniti — Charge Air Cooler Cooling Electric Water Pump
P14AC 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.