Guide To P022C OBD Error Code Solutions

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P022C is a kind of OBD-II Powertrain Diagnostic Trouble Code. Error Code P022C is described as Charge Air Cooler Bypass Control ‘A’ Circuit High. When ECM detects the higher than desired electrical value it sets this error code P022C.It is also termed as Turbocharger intercooler bypass actuator A – circuit high. If you start facing issues like hesitation upon acceleration, excessive exhaust leak, rich or lean exhaust then please don’t leave these issues unattended as these are the symptoms for error code P022C.

Diagnostics Trouble Codes (DTCs) are codes that the vehicle's electronic control unit generates when it detects malfunction or other issues. And the trouble code P022C Charge Air Cooler Bypass Control A Circuit High is set when the ECM detects a higher than desired electrical value. This is a generic code which applies to all the vehicles equipped with charge air cooler or Intercooler which works similar to a radiator. These Intercoolers cools air to make a more efficient air/fuel mixture in turn, better fuel mileage, better performance etc., it is part of the charge pressure side of the induction system. And the bypass valve is used to let the air bypass the intercooler. This code may be cause by a mechanical or electrical fault.

The ECM illuminates the check engine light with P022C when it monitors a condition outside of a specific range within the intercooler bypass control circuit or system. The Check Engine Light will stay on until the readiness monitor related to that fault has been reset and the sensor that was recorded out-of-range is seen as within range again.

What causes the problem of Charge Air Cooler Bypass Control “A” Circuit High?

• Rough running engine due to misfiring plugs
• Faulty Air Cooler Bypass Control Valve
• Poor electrical connection
• Faulty PCM
• Damaged wiring harness
• Defective Fuse/relay
• Problematic Pin / Connector

1. Air Cooler Bypass Control Valve - As the name suggests Air Cooler Bypass Control Valve, it allows turbo-boosted charged air to bypass a charge-air cooler. In case you find this valve is defective please replace it at earliest.
2. Air Flap Actuator - Air flap actuator is just an electrical machine that moves the flap. The function of this flap is to open or close the certain portions of the duct in order to control which way the air goes. It is also termed as Damper. If it is malfunctioned will lead to this OBD Code.
3. Engine Control Module - The ECM/ PCM, is most important part of the vehicle’s on-board computer, which is generally mounted in either the engine compartment or under one of your front seats, it gives the brain for the engine of the vehicle and ensure the timing and emissions control system work efficiently. So, if it found faulty should be repaired or replaced as required.
4. Defective Fuse/Relay - Make sure to replace your defective fuses and relays however they look small but plays a crucial role in efficient functioning of your vehicle.
5. Pin/Connector - If in case the Pin or connector has indications of corrosion and broken lock tab, please replace them on priority basis as these could be the main factor creating this trouble code.
6. Diagnostic Tool - To diagnose and fix any trouble code, one should have the best quality of diagnostic tool. Explore our web for high grade diagnostic tools at best possible prices.

Below are the common symptoms for the code P022C. If you experience below mentioned symptoms please bring your vehicle to a reputable repair facility. Keep in mind; problems don’t get better over time unless rectified.

• Difficulty while acceleration
• Excessive exhaust leak
• Lacky exhaust
• The light may stay on or light intermittently as the DPF regenerates.
• The engine will be sluggish on acceleration.
• Vehicle invading “limp mode”
• Engine misfires

To Correct Charge Air Cooler Bypass Control “A” Circuit High you may require the tools like OBD code reader, Hose clamp pliers, Lubricant, Basic socket, screwdriver and wrench sets, Battery terminal cleaner etc. But we always recommend you to have a step by step analysis and diagnosis by a qualified technician using high grade diagnostic tools.

• Ensuring that your engine is in off position try to locate your charge air cooler bypass control valve by following the charge piping going to Intercooler. Once valve is located, look for any physical damage. If found faulty replace it.
• Investigate for any obstructions in the valve’s range of motion by removing the valve completely from the vehicle. And if possible, clean it properly before reinstalling.
• Examine the wires involved in the circuit carefully, to ensure that they should not have any cuts or signs of corrosions.
• If approachable try to disconnect one end of valve to gain sight of the moving parts. Use your scan tool and open valve completely and close while monitoring the mechanical operation of the valve. If you notice the valve sticking and there is nothing obstructing it, it indicates that the valve is defective.
• Using Multimeter, confirm the integrity of the circuit by performing numerous basic electrical tests.
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Diagnostic trouble code P022C 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.

• Look at the plug wires to make sure they are not burnt or lying on the exhaust.
• Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame.
• Check for damage to the wiring harness connector.

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 P022C.

Common Mistakes When Diagnosing the P022C Code

Please remember these few things just to avoid committing mistakes while diagnosing the error code P022C. Generally people miss on these things and commit mistakes.

• Confirm and record the integrity of your battery and charging system before troubleshooting.
• Make sure engine is off.
• Before performing any electrical repairs, make sure to disconnect.

Always refer to service manual first because it’s the matter of your expensive vehicle.