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Engine-Codes – Generic – P023C

P023C Code - Charge Air Cooler Coolant Pump Control Circuit High

Quick Answer

The diagnostic code P023C indicates a problem with the Charge Air Cooler (CAC) Coolant Pump Control Circuit, specifically signaling a high voltage condition. Common causes include Charge Air Cooler (CAC) coolant leakage, Faulty Charge Air Cooler Cooling Electric Water Pump, Wiring issues or short circuits 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
P023C 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 or short circuits 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 P023C Description

The diagnostic code P023C indicates a problem with the Charge Air Cooler (CAC) Coolant Pump Control Circuit, specifically signaling a high voltage condition. The CAC Cooling Electric Water Pump plays a critical role in maintaining optimal engine performance by circulating coolant through the intercooler system. This process helps to lower the temperature of the compressed air entering the engine, which is essential for improving air density and enhancing combustion efficiency. When the air is cooler, it allows for a more efficient fuel-air mixture, leading to better engine performance, increased power output, and improved fuel economy. If this code is triggered, it suggests that the pump may be receiving an abnormal voltage signal, which could lead to improper operation or complete failure of the pump. Ignoring this issue can result in higher intake air temperatures, which can lead to engine knocking, reduced performance, and potential long-term damage to the turbocharger or supercharger. Over time, if the pump fails to operate correctly, it can cause overheating of the intercooler, leading to decreased engine efficiency and increased wear on engine components. Therefore, addressing this code promptly is crucial to maintaining engine health and performance.
OBDII Code P023C - Charge Air Cooler Coolant Pump Control Circuit High
P023C Code - Charge Air Cooler Coolant Pump Control Circuit High

Common Causes of P023C

  1. Charge Air Cooler (CAC) coolant leakage
  2. Faulty Charge Air Cooler Cooling Electric Water Pump
  3. Wiring issues or short circuits in the pump control circuit
  4. Corroded or damaged connectors affecting the pump's electrical supply
  5. Faulty Engine Control Module (ECM) sending incorrect signals to the pump

Symptoms of P023C

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased engine performance, especially under load
  3. Increased intake air temperatures
  4. Possible overheating of the engine under heavy load
  5. Unusual noises from the engine compartment, particularly near the pump

How to Fix P023C

  1. Perform a visual inspection of the Charge Air Cooler and associated hoses for leaks or damage.
  2. Test the Charge Air Cooler Cooling Electric Water Pump for proper operation and voltage supply.
  3. Inspect wiring and connectors for signs of corrosion, damage, or loose connections.
  4. If necessary, replace the faulty Charge Air Cooler Cooling Electric Water Pump.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure the issue is resolved.

Cost to Fix P023C

The cost to diagnose and repair a P023C code can vary significantly based on the specific issue and the make and model of the vehicle. Typically, parts for a replacement Charge Air Cooler Cooling Electric Water Pump can range from $100 to $300, while labor costs may range from $80 to $150 per hour depending on the shop. Overall, you might expect to spend between $200 and $600 for the entire repair, including parts and labor. Dealerships may charge higher rates, while independent shops often offer more competitive pricing.

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Code P023C Information for Specific Makes

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 P023C Code

1. What are the common symptoms of OBDII code P023C?

The common symptoms of code P023C include reduced engine performance, illuminated check engine light, and potential issues with the charge air cooler system.

2. What could cause the OBDII code P023C to trigger?

The code P023C is typically triggered by a malfunction in the charge air cooler coolant pump control circuit, which may be caused by electrical faults, damaged wiring, or a faulty coolant pump.

3. How can I diagnose the cause of OBDII code P023C?

Diagnosing code P023C involves inspecting the charge air cooler coolant pump, checking the wiring and connectors for any damage, and using a scan tool to identify the specific issue with the control circuit.

4. Are there any quick repair tips for resolving OBDII code P023C?

Quick repair tips for code P023C include checking and repairing any damaged wiring or connectors, testing the charge air cooler coolant pump, and clearing the code to see if it reoccurs.

5. Can I drive my vehicle with OBDII code P023C?

It is not recommended to drive your vehicle with code P023C present, as it can lead to decreased engine performance and potential damage to the charge air cooler system.

6. How serious is OBDII code P023C?

Code P023C should be addressed promptly as it can impact engine performance and fuel efficiency. Ignoring this code may result in further damage to the charge air cooler system.

7. Will resetting the check engine light resolve OBDII code P023C?

Simply resetting the check engine light will not fix the underlying issue causing code P023C. It's important to diagnose the problem, make necessary repairs, and clear the code properly.

8. Can a DIY enthusiast fix OBDII code P023C at home?

While some aspects of diagnosing and repairing code P023C can be done at home, it may require specialized tools and knowledge. It's recommended to consult a professional mechanic for accurate diagnosis and repair.

9. How much does it cost to repair OBDII code P023C?

The cost of repairing code P023C can vary depending on the extent of the issue, parts needed for replacement, and labor rates. It's best to obtain a quote from a trusted mechanic or repair shop.

10. Is it possible for OBDII code P023C to reoccur after repairs?

If the underlying issue causing code P023C is not properly fixed, there is a possibility for the code to reoccur. It's crucial to ensure that all necessary repairs are made to prevent future occurrences.

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