P022D - OBD Trouble Code

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If you encounter problems like engine surge, blown fuse, lack of power and lack of boost from turbo/supercharger then don’t leave these issues ignored as these are the symptoms for OBD Code P022D. OBD-II Code Powertrain Control Module (PCM) failure is defined as a Charge Air Cooler Bypass Control "B" Circuit /Open, when PCM cannot control the actuator, it set the code P022D. PCM may also disable the turbo/supercharger to prevent further damage to the system.

OBD II Code P022D is technically described as Charge Air Cooler Bypass Control ‘B’ Circuit Open. 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. You will notice a decrease in fuel

mileage and over time the car will eventually start stalling a lot. Rusty exhaust systems, cracked

exhaust manifolds or damaged or missing gaskets or donuts cause air leaks. An air leak forward of the DPF will change the sensor readings resulting in the code. This code can be caused either by mechanical or electrical fault or both. Severity in this code would be moderate.

The ECM illuminates the check light as this diagnostic trouble code P022D arises. Charge Air Cooler Bypass Control B Circuit Open code is set when the ECM detects a general malfunction and/or open within the “B” circuit. This Code should not be left unattended as it could develop into something much more serious in near future.

What causes the problem of Charge Air Cooler Bypass Control “B” Circuit Open?

• Air flap actuator failure
• PCM failure
• Wiring problem
• Problematic electrical connection
• Flawed fuse/relay
• Corroded or broken Pin / Connector

1. Air Cooler Bypass Control Valve - If by any chance Air cooler bypass control valve is faulty then you may have to face lots of problems. As per its name this Air Cooler Bypass Control Valve allows turbo-boosted charged air to bypass a charge-air cooler. Faulty valve will restrict this function.
2. Air Flap Actuator - A flap actuator which is also called a damper is simply an electrical machine that moves the flap which is used to open or close the particular portions of the duct in order to control which way the air goes. If it is malfunctioned will lead to this OBD Code.
3. Engine Control Module - ECM/ PCM it basically provides the brain for the engine of the vehicle and ensure the timing and emissions control system works properly. It is generally mounted either in the engine compartment or under one of your front seats. So, if it founds malfunctioned should be repaired or replaced as required.
4. Defective Fuse/Relay - Sometimes small parts of some big machines plays very important part in its proper functioning So do the Fuses and Relays however they look small but plays a vital in smooth functioning of your vehicle, so, make sure to replace them if discover faulty.
5. Pin/Connector - Defective Pin / Connector always create problems and these could also become main factor creating this trouble code P022D so make sure these should not be corroded and have broken lock tab.
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Keep in mind; problems don’t get better over time unless rectified. If you experience below mentioned symptoms please bring your vehicle to a reputable repair facility. Symptoms which specify error code OBD P022D may comprise:

• Engine surge
• Blown fuse
• Lack of power
• The light may stay on or light intermittently as the DPF regenerates.
• The engine will be sluggish on acceleration.
• Reduced fuel mileage
• Vehicle invading into “limp mode”

To correct or fix this code one should seek assistance from a trained automotive diagnostician but if you want to do it by yourself, please follow the below mentioned steps:

• Try to locate the charge air cooler bypass control valve in your vehicle by following the charge piping going to IC, you may find it directly mounted to charge pipe. Once valve is located, inspect for any physical damage. If found faulty replace it.
• Evacuate the valve completely from the vehicle to verify its functionality and inspect for any obstructions in the valve’s range of motion.
• Harness for the bypass valve may be drive off through the areas that are exposed to the elements. So, inspect the wires involved in the circuit carefully.
• Check and verify the valve’s functionality by controlling it and observing its range of motion with the help of your scan tool. If you notice the valve sticking and there is nothing obstructing it, it indicates that the valve is defective.

Rule out any electrical problem by using multimeter to confirm the integrity of the circuit by performing numerous basic electrical tests.

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Diagnostic trouble code P022D is not difficult to diagnose and repair, although specific repair steps may be different depending on your car model. Thus, it always pays to have a qualified technician to look after your vehicle when this error code arises.

• First of all, disconnect the valve
• The red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.
• Clear the codes and test-drive the vehicle to see if the code is reset.

Note: If you find a related TSB, the information will often help in diagnosing the code. Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P022D.

Common Mistakes When Diagnosing the P022D Code

Remember below mentioned things to avoid mistakes while diagnosing the error code P022D. Generally, people do not pay much attention and commit mistakes.

• Kindly check and record the integrity of your battery and charging system before troubleshooting.
• Make sure engine is off.
• Confirm if battery is disconnected before performing any electrical repairs.

Kindly refer to service manual first because it’s the matter of your costly vehicle.