Technical Description of OBD-II Trouble Code
The charge air cooler bypass control B circuit is experiencing high levels of electrical activity.
What does that mean?
This generic powertrain diagnostic trouble code (DTC) is applicable to all OBD-II vehicles equipped with a charge air cooler, including Ford, Chevy, Mazda, Toyota, and others.
In forced induction systems, a charge air cooler, also known as an intercooler (IC), is used to cool the air that the engine uses. This functions similarly to a radiator.
The intercooler cools the air to create a more efficient air/fuel mixture, resulting in improved fuel mileage and performance. It is part of the charge pressure side of the induction system. The bypass valve allows the air to bypass the intercooler and be released into the atmosphere or recycled. The Engine Control Module (ECM) adjusts the valve based on current engine conditions and needs.
The ECM triggers the check engine light and displays the P022F code when it detects a condition outside the specified range within the intercooler’s bypass control circuit and/or system. This code may be caused by a mechanical or electrical fault, with mechanical problems being more likely. However, both are possible.
The P022F code is set when the ECM detects a higher than desired electrical value within the “B” circuit. Consult a manufacturer-specific repair manual to determine which circuit is the “B” circuit in your specific application.
What is the severity of this DTC?
In this case, the severity is moderate. It is important not to ignore this issue as it could quickly develop into a more serious problem. Remember, problems do not improve over time unless addressed. Engine damage can be expensive, so if you have exhausted your abilities, take your vehicle to a reputable repair facility.
What are some of the symptoms of the code?
Symptoms of the P022F engine code may include:
What are some of the common causes of the code?
Possible causes for this code include:
What are some P022F troubleshooting steps?
Check for any technical service bulletins (TSBs) related to your vehicle. Accessing a known fix can save time and money during diagnosis.
Tools
When working within the forced induction system, you may need the following tools:
Safety Tips
NOTE: ALWAYS verify and record the integrity of your battery and charging system before further troubleshooting.
Basic Step #1
Locate the charge air cooler bypass control valve by following the charge piping to the intercooler (IC). It may be directly mounted to the charge pipe. The location of the IC can vary depending on the make and model of your vehicle, such as in the front bumper, front fenders, or directly under the hood. Once you find the valve, inspect it for any obvious physical damage.
NOTE: Make sure the engine is off.
Basic Step #2
If code P024B is active, it may be beneficial to remove the valve from the vehicle to verify its functionality. Inspect the valve for any obstructions in its range of motion. If possible, clean the valve before reinstalling it.
NOTE: Always refer to the service manual first, as removing the valve may not be possible or recommended for your vehicle.
Basic Tip #3
Inspect the harness for the bypass valve, especially in areas exposed to the elements. Look for nicks, cuts, signs of corrosion, or other damage to the wires involved in the circuit.
NOTE: Disconnect the battery before performing any electrical repairs.
Basic Step #4
Depending on your scan tool, you may be able to verify the functionality of the valve by controlling it and observing its range of motion. If accessible, you could disconnect one end of the valve to gain visibility of the moving parts. Use your scan tool to fully open and close the valve while observing its mechanical operation. If you notice the valve sticking and there are no obstructions, it is likely defective. In this case, consider replacing it. Make sure to follow the manufacturer’s recommendation for a new valve. Consult the manual for guidance.
Basic Step #5
To rule out any electrical problems within the harness, you may need to disconnect it at the valve and the ECM. Use a multimeter to test the circuit’s integrity through various basic electrical tests, such as continuity. If everything checks out, there may be some input tests involving testing the connector at the valve to verify the ECM’s functionality with the valve.
