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Engine-Codes – GMC – P023C GMC

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

Common Causes of P023C GMC

  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 GMC

  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 GMC

  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 GMC

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.

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