P023B OBD Error Code: Problem & Solutions

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Is your car engine stalling and not starting? Is there an increase in the fuel consumption? Have you lost the response from the engine with sudden downfall in acceleration? All these can be an indication towards P023B.

OBD-II Code Wiring issue is defined as a Charge Air Cooler Coolant Pump Control Circuit Low.

If the air entering the engine is not to the optimal temperature, it will straight away affect the combustion process due to wrong fuel/air mixture ratio and density, resulting the loss of proper response from the engine.

The Charge Air Cooler Temperature Sensors tell the engine control module (PCM) the temperature of the air going into an out of the charge air cooler assembly. The function of the Charge Air Cooler Assembly is to cool the air coming out of the turbocharger before it goes into the engine. If the PCM detects an incorrect signal from the Charge Air Cooler Sensor, the PCM will set code P023B.

What causes the problem with the Charge Air Cooler Coolant Pump Control Circuit Low?

• Fault in the Intercooler Pump
• Damaged and loose wiring and connectors
• Charge Air Cooler is not functioning properly
• ECM/PCM circuit problem with system error

1. Engine Control Module - Faulty ECM can flash and store wrong OBD error. It’s better to get the faulty electricals replaced as soon as possible.
2. Intercoolers - An intercooler cools the air compressed by the turbo/supercharger, reducing its temperature and thereby increasing the density of the air supplied to the engine. Visit us to buy quality intercooler today!
3. Diagnostic Tool - Find high grade diagnostic tools to detect the OBD error code from us. Visit us today to grab amazing deals.
4. Air Cooler Coolant Pump - Check if the coolant pump can be faulty, thus giving wrong reading to the PCM by not functioning properly. Replace the old pump now!
5. Air Cooler Coolant Pump Harness - Faulty/damaged harness may cause improper functioning of the pump. Replace it immediately.
6. Coolant Hoses/Pipes - Check for damaged hoses and thus repair or replace as needed.
7. Coolant/Antifreeze - Keep the antifreeze levels optimal for proper functioning of the intercoolers. Buy now!
8. Cooling System - Check for any faulty cooling system parts and replace as needed to check for the proper functioning. Explore now!

P023B error indicated the issue relation to the intercoolers and air temperature sensors. Although it is difficult to track it problem, but few symptoms are indicative enough to raise the issue. Some symptoms are listed below;

Common Symptoms

• Illumination of Check Engine Light
• Inefficient engine performance and response
• Increased fuel consumption
• Limp mode on to protect the engine from further damage
• Inhibited fuel particulate filter regeneration 

Some of the components that are directly affected and can be examined first to detect the problem and solve it are mentioned below.

• Replacement Charge Air Cooler Coolant Pump – It is the prime component that keeps the check on the temperature of the air entering the engine and coordinated with the ECM.
• Bad wiring to the Charge Air Cooler Coolant pump and circuit can be the first reason for the sensor’s fault and for the Error P023B to flash.
• PCM (Powertrain Control Module) – If all the other tests deemed out to be perfect, then the PCM should be checked for faults and replaced if necessary.

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Look for loose connections, damaged wiring, etc., by visually inspecting the charge air cooler temperature sensor and the wirings. Also check for damages to the charge air cooler and ducting, repair if needed, clear the code and see if it returns.

• Find the Intercooler aka Charge Air Cooler which is located in a location where they can receive optimal air flow (e.g. front of radiator, inside front bumper, under hood). Once located, you will have to find the coolant lines/ pipes in order to trace back to the coolant pump.
• Given the temperatures that the coolant system is exposed to, it would be wise to inspect the harness around the area thoroughly for signs of melting harness or things of that nature.
• Check your coolant levels and also the health of the coolant. Make sure it is clean and full before proceeding.
• Measure the charge air cooler control circuit and test the control circuit. This may involve disconnecting the connector at the ECM (Engine Control Module) and the other end at the coolant pump. Refer to your wiring diagram for specific wiring colours and test procedures.
• Test the coolant pump depending on your particular system. After all, they are just electric pumps. Equipped with a 12-volt source and a good ground, remove the coolant pump from the vehicle, and power it up to see if it fires up at all. If so, you may want to make sure it can transfer fluid as well
• ECM diagnosing is always a last resort but sometimes it can be done with relative ease. It usually involves doing a pinout test at the ECM itself and compare your recordings to desired values.

Common Mistakes When Diagnosing OBD Code P023B

Always take assistance of a qualified technician to know the problem to this error. Never lose sight of the symptoms and never be in hurry to come to a conclusion as sometimes very small issue can lead to flashing of the OBD errors. Some of the major mistakes related to code P023B are mentioned below.

• Replacement of the intercooler pump without checking the associated wirings and terminals
• Powertrain Control Module (PCM) replacement without inspecting the sensors and data transmission units
• Worn out and damaged wiring and connectors not checked and replaced