P022D Charge Air Cooler Bypass Control B Circuit Open
OBD-II Trouble Code Technical Description
Charge Air Cooler Bypass Control B Circuit Open
What does that mean?
This generic powertrain diagnostic trouble code (DTC) typically applies to all OBD-II vehicles equipped with a charge air cooler. That may include but is not limited to vehicles from Ford, Chevy, Mazda, Toyota, etc.
In forced inducted systems, they use a Charge Air Cooler or what I am going to call it, an Intercooler (IC) to help in cooling the charge air the engine uses. These work similar to a radiator.
In the IC's case, instead of cooling antifreeze, it cools air to make for a more efficient air/fuel mixture in turn, better fuel mileage, better performance etc.. The IC is part of the charge pressure side of the induction system. The bypass valve is used just as the name implies, to let the air bypass the intercooler to be dumped into the atmosphere and/or recycled. The Engine Control Module (ECM) uses it to adjust valve according to current engine conditions and needs.
The ECM illuminates the check engine light with P022D and associated codes when it monitors a condition outside of a specific range within the intercooler's bypass control circuit and/or system. This code may be cause by a mechanical and/or electrical fault. If I had to guess here, I would lean towards a mechanical problems more likely being the problem. That being said either are possible.
P022D Charge Air Cooler Bypass Control B Circuit Open code is set when the ECM detects a general fault and/or open within the "B" circuit. Refer to a manufacturer specific repair manual to determine which is the "B" circuit in your particular application.
What is the severity of this DTC?
Severity in this case would be moderate. You don't want to leave this issue unattended as it could develop into something much more serious fairly quickly. Keep in mind, problems don't get better over time unless rectified. Engine damage is expensive, almost every time so if you've exhausted your abilities, bring vehicle to a reputable repair facility.
What are some of the symptoms of the code?
Symptoms of a P022D engine code may include:
Poor engine performance Vehicle entering "limp mode" Engine misfiring Poor fuel mileageWhat are some of the common causes of the code?
Causes for this code may include:
Stuck open/closed bypass valve Obstruction in bypass valve's operational range of motion Open within circuit Broken or damaged wiring harness Fuse/relay defective ECM issue Pin/connector problem. (e.g. corrosion, broken lock tab, etc.)What are some P022D troubleshooting steps?
Be sure to check for technical service bulletins (TSBs) for your vehicle. Getting access to a known fix can save you time and money during diagnosis.
Tools
When working within the forced induction system you may need:
OBD code reader Hose clamp pliers Lubricant Multimeter Basic socket set Basic ratchet and wrench sets Basic screwdriver set Rag/shop towels Battery terminal cleaner Service manualSafety Tips
Let engine cool Chalk wheels Wear PPE (Personal protective equipment)NOTE: ALWAYS verify and record the integrity of your battery and charging system before further troubleshooting.
Basic Step #1
Locate your charge air cooler bypass control valve by following the charge piping going to your intercooler (IC), it may be mounted directly to charge pipe. Depending heavily on your particular make and model, you may find your IC mounted in your front bumper, front fenders or possibly directly under the hood among many other possible locations. Once valve is located, inspect for any obvious physical damage.
NOTE: Make sure engine is off.
Basic Step #2
It may be fairly simple to remove the valve completely
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