P023A Fault Code

P023A OBD-II Trouble Code Short Description

Charge Air Cooler Coolant Pump Control Circuit Open

What does trouble code P023A mean?

P023A is a diagnostic trouble code (DTC) that indicates an open circuit in the control circuit of the charge air cooler (CAC) coolant pump. The CAC pump is responsible for circulating coolant through the charge air cooler, which is an essential component in turbocharged engines. The charge air cooler cools compressed air from the turbocharger before it enters the engine, increasing its density and improving the engine's performance.

If the control circuit of the CAC coolant pump is open, the coolant pump won't operate correctly, and the charge air cooler won't function correctly, leading to potential engine performance problems. Several factors can contribute to an open circuit, including faulty wiring, a failed CAC coolant pump, or a malfunctioning electrical connector.

To solve this issue, you need to check the wiring harness and connectors for signs of damage or corrosion and repair or replace them as necessary. You can also test the CAC coolant pump to ensure it's functioning correctly and replace it if required. Additionally, you must clear the DTC from the vehicle's control module using a diagnostic scanner after addressing the underlying problem to ensure the code doesn't reappear.


What are the symptoms of the P023A code?

Symptoms of P023A fault code on cars may include:

  • Check engine light on
  • Reduced engine performance
  • Rough idle
  • Engine stalling
  • Overheating of the engine
  • Inability to start the engine
  • Decreased gas mileage


What causes the P023A code?

The P023A fault code is caused by an open circuit in the charge air cooler coolant pump control circuit. This can be caused by a faulty pump relay, damaged wiring, or a malfunctioning pump control module. It can also be triggered by a low coolant level in the charge air cooler system. A diagnostic scanner is often needed to accurately diagnose and fix the issue.

Possible Solutions

How to fix P023A?

To fix the P023A fault code on cars, follow these steps:

  1. Check the charge air cooler coolant pump fuse: Make sure the fuse is not blown or damaged. If it is, replace it.

  2. Check the charge air cooler coolant pump relay: Use a multimeter to test the continuity of the relay. If it's faulty, replace it.

  3. Check the charge air cooler coolant pump wiring: Inspect the wiring for any visible signs of damage, such as frayed or broken wires. Repair or replace as needed.

  4. Test the charge air cooler coolant pump: Use a multimeter to check if the pump is receiving voltage when it's supposed to be on. If it's not, replace the pump.

  5. Check the coolant level: If the coolant level is low, refill it to the proper level.

  6. Check the engine coolant temperature sensor: If the sensor is faulty, it can cause the charge air cooler coolant pump to malfunction. Replace if necessary.

  7. Check the powertrain control module (PCM): If all of the above steps have been completed and the issue still persists, it's possible there's a problem with the PCM. A professional mechanic should be consulted at this point.