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P023C Chevrolet Code - Charge Air Cooler Coolant Pump Relay Control Circuit High

Quick Answer

The P023C diagnostic trouble code for Chevrolet vehicles indicates a problem with the Charge Air Cooler Coolant Pump Relay Control Circuit being too high. Common causes include Faulty charge air cooler coolant pump relay: A malfunctioning relay can cause an incorrect voltage signal to be sent to the charge air cooler coolant pump, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electrical signals to the relay, Faulty charge air cooler coolant pump: A malfunctioning pump can also trigger this code by not responding to the control circuit properly. 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 Chevrolet indicates Charge Air Cooler Coolant Pump Relay Control Circuit High.
Common causes
Common causes include Faulty charge air cooler coolant pump relay: A malfunctioning relay can cause an incorrect voltage signal to be sent to the charge air cooler coolant pump, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electrical signals to the relay, Faulty charge air cooler coolant pump: A malfunctioning pump can also trigger this code by not responding to the control circuit properly.
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 Chevrolet Description

The P023C diagnostic trouble code for Chevrolet vehicles indicates a problem with the Charge Air Cooler Coolant Pump Relay Control Circuit being too high. The charge air cooler coolant pump is responsible for circulating coolant through the charge air cooler, which is an essential component in turbocharged engines. The charge air cooler helps cool down the compressed air coming from the turbocharger before it enters the engine, improving combustion efficiency and reducing the risk of engine knocking.
OBDII Code P023C Chevrolet - Charge Air Cooler Coolant Pump Relay Control Circuit High
P023C Chevrolet Code - Charge Air Cooler Coolant Pump Relay Control Circuit High

Common Causes of P023C Chevrolet

  1. Faulty charge air cooler coolant pump relay: A malfunctioning relay can cause an incorrect voltage signal to be sent to the charge air cooler coolant pump.
  2. Wiring issues: Damaged or corroded wiring connections can disrupt the flow of electrical signals to the relay.
  3. Faulty charge air cooler coolant pump: A malfunctioning pump can also trigger this code by not responding to the control circuit properly.
  4. Software or programming issues: In some cases, software glitches or programming errors can lead to incorrect voltage signals being sent to the relay.
  5. Electrical system issues: Problems with the vehicle's electrical system, such as a weak battery or alternator, can also contribute to this code.

Symptoms of P023C Chevrolet

  1. Engine overheating: Due to inadequate coolant circulation, the engine may overheat, leading to potential damage.
  2. Reduced turbocharger performance: A malfunctioning charge air cooler coolant pump can result in reduced turbocharger efficiency and power output.
  3. Check Engine Light: The illumination of the Check Engine Light on the dashboard is a common symptom associated with this code.
  4. Increased fuel consumption: Inefficient cooling of the compressed air can lead to higher fuel consumption as the engine compensates for reduced performance.

How to Fix P023C Chevrolet

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the P023C code and perform a thorough inspection of the charge air cooler coolant pump relay control circuit.
  2. Check wiring and connections: Inspect the wiring harness for any damage or corrosion, and ensure all connections are secure.
  3. Test the charge air cooler coolant pump relay: Test the relay to determine if it is functioning correctly or needs to be replaced.
  4. Inspect the charge air cooler coolant pump: Check the pump for any signs of malfunction and replace if necessary.
  5. Clear the code: After completing the repairs, clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P023C Chevrolet

The cost of repairing a P023C code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing a charge air cooler coolant pump relay can range from $100 to $200, while replacing the charge air cooler coolant pump itself can cost between $200 and $500. Additional costs may include diagnostic time, labor charges, and any other necessary parts or repairs. It's recommended to get a detailed estimate from a qualified mechanic or dealership to determine the exact cost for your vehicle.

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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.

Frequently Asked Questions about P023C Chevrolet Code

1. What are common symptoms of OBDII code P023C in a Chevrolet related to the charge air cooler coolant pump relay control circuit high?

- Common symptoms include illuminated Check Engine Light, engine overheating, reduced engine performance, and potential coolant leaks.

2. What are possible causes of OBDII code P023C in a Chevrolet indicating a high charge air cooler coolant pump relay control circuit?

- Possible causes include a faulty charge air cooler coolant pump relay, damaged wiring or connectors, low coolant levels, or a malfunctioning engine coolant temperature sensor.

3. How can I diagnose the high charge air cooler coolant pump relay control circuit issue triggering OBDII code P023C in my Chevrolet?

- Diagnosis typically involves checking the charge air cooler coolant pump relay, inspecting the wiring and connectors for damage, testing the engine coolant temperature sensor, and verifying coolant levels.

4. Can driving with OBDII code P023C present in a Chevrolet cause further damage to the vehicle?

- Continuing to drive with this code may lead to engine overheating, reduced engine performance, and potential damage to engine components if the issue is not addressed promptly.

5. Are there any simple repair tips for addressing OBDII code P023C related to the charge air cooler coolant pump relay control circuit high in a Chevrolet?

- It is recommended to first check and replace the charge air cooler coolant pump relay if necessary, inspect and repair any damaged wiring or connectors, and ensure proper coolant levels are maintained.

6. How can I reset the Check Engine Light after resolving the high charge air cooler coolant pump relay control circuit issue in my Chevrolet?

- The Check Engine Light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the code and reset the light.

7. Is it safe to continue driving my Chevrolet with OBDII code P023C if I am unable to address the issue immediately?

- It is not recommended to drive the vehicle with this code present, as it can lead to engine overheating and potential damage. It is best to address the issue as soon as possible.

8. Can a DIY enthusiast with basic automotive knowledge repair OBDII code P023C related to the charge air cooler coolant pump relay control circuit high in a Chevrolet?

- Depending on the specific cause, a DIY enthusiast may be able to address this issue by replacing the charge air cooler coolant pump relay, checking and repairing wiring, and ensuring proper coolant levels.

9. How long does it typically take to repair OBDII code P023C in a Chevrolet caused by a high charge air cooler coolant pump relay control circuit issue?

- The repair time can vary based on the exact cause and the individual's experience level, but it can usually be addressed within a few hours to a day with the necessary tools and parts.

10. Are there any recalls or service bulletins related to OBDII code P023C in Chevrolet vehicles for the charge air cooler coolant pump relay control circuit high issue?

- It is advisable to check with a Chevrolet dealership or online resources for any relevant recalls or service bulletins related to this specific OBDII code to ensure proper resolution.

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