Fix P023C: STEP-BY-STEP diagnostic GUIDE!

The P023C: Charge Air Cooler Coolant Pump Control Circuit High refers to an issue where the control circuit for the charge air cooler coolant pump is experiencing higher than expected voltage levels. This problem can occur due to a faulty pump control, wiring issues such as shorts or opens, or a malfunctioning Powertrain Control Module (PCM). When this code appears, it indicates that the circuit may be delivering too much voltage, which could potentially damage the pump or reduce its efficiency.

P023C – Quick Overview

Meaning	P023C: Charge Air Cooler Coolant Pump Control Circuit High
Is it serious?	Yes, this code can be serious as high voltage in the circuit may cause the coolant pump to operate improperly, potentially leading to overheating and engine performance issues.
Possible causes	– High voltage in the charge air cooler coolant pump control circuit – Faulty charge air cooler coolant pump control – Wiring issues such as shorts or opens – Faulty PCM
How to diagnose?	– Test the charge air cooler coolant pump control for proper operation. – Check for high voltage in the pump control circuit. – Inspect the wiring and connectors for defects. – Replace or repair any faulty components.

P023C Meaning

The P023C: Charge Air Cooler Coolant Pump Control Circuit High code indicates that the voltage in the control circuit for the charge air cooler coolant pump is higher than it should be. This could be due to issues with the pump control itself, wiring problems, or the vehicle’s PCM. When this code is triggered, it suggests that the coolant pump may be receiving too much power, which could impair its function and potentially lead to engine overheating.

Step-by-step diagnostic guide

Follow the outlined procedure to diagnose this DTC by eliminating possible causes one by one.

Action	Description	Tools Needed
Check for Other Codes	Use an OBD-II scanner to check if there are any other related codes present. These might give additional clues about the problem.	OBD-II Scanner
Inspect the Charge Air Cooler Coolant Pump Control	Visually inspect the control circuit and pump for any signs of damage, corrosion, or disconnection. Ensure all components are securely attached.	Flashlight, Safety Gloves
Test the Pump Control Circuit	Use a multimeter to measure the voltage in the charge air cooler coolant pump control circuit. Compare the readings to the manufacturer’s specifications to determine if the voltage is too high.	Multimeter, Manufacturer’s Specifications
Inspect Wiring and Connectors	Carefully check the wiring and connectors leading to the charge air cooler coolant pump for any signs of wear, corrosion, or breaks. Look for loose or disconnected wires that could cause high voltage.	Flashlight, Multimeter
Repair or Replace Damaged Wiring/Connectors	If any wiring or connectors are damaged, shorted, or corroded, repair or replace them. Ensure all connections are secure and free from contaminants.	Wire Strippers, Electrical Tape, Replacement Wires/Connectors
Check the PCM (Powertrain Control Module)	Inspect the PCM and its connections for any signs of damage or loose connections. If the PCM is suspected to be faulty and causing high voltage, it may need reprogramming or replacement.	OBD-II Scanner, Multimeter
Clear the Code and Test Drive	After completing the necessary repairs, clear the P023C code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return.	OBD-II Scanner, Vehicle Owner’s Manual
Recheck for Codes	After the test drive, re-scan the vehicle to ensure the P023C code has not reappeared. If the code returns, further diagnosis may be required.	OBD-II Scanner