P024B OBD Error Code: Problem & Solutions

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Are you confronting issues with your vehicle like poor engine performance, engine misfiring, poor fuel mileage and lack of boost from turbocharger? Then don't ignore it, these are the symptoms of OBD Code P024B.

PCM regulate and observe the Charge Air Cooler Bypass Control Valve which regulates air flow through the charge air cooler. PCM sets this OBD Code P024B when the Charge Air Cooler Bypass Control Valve stops working to the PCM signal. 

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Charge Air Cooler Bypass Control "A" Stuck. This generic powertrain diagnostic trouble code (DTC) typically applies to all OBD-II vehicles equipped with a charge air cooler. The Charge Air Cooler Bypass Position Sensor is assembled into the Air Flap Actuator on most vehicles. This Air Flap Actuator obstruct airflow through the charge air cooler. If the PCM cannot control the actuator, it will set code P024B.

The ECM illuminates the check engine light with P024B and associated codes when it observes a problem with intercooler bypass control circuit or system. P024B Charge Air Cooler Bypass Control “A” Circuit Stuck code is set when the ECM detects that the valve is stuck and can no longer control it electronically.

What causes the problem of Charge Air Cooler Bypass Control "A" Circuit Stuck?

• Air flap actuator failure
• Poor electrical connection or wiring issue
• Clogged bypass valve
• Damaged Fuse/relay
• Corroded or broken pin/connector
• Faulty Air Cooler Bypass Control Valve
• Faulty ECM
• Open or shorted Air Cooler Bypass Control Valve harness

1. Engine Control Module - The ECM/ PCM, it’s a crucial part of the vehicle’s on-board computer, which usually resides in either the engine compartment or under one of your front seats, it provides the brain for the engine of the vehicle and makes sure the timing and emissions control system work properly. So, if it founds faulty should be repaired or replaced as required.
2. Defective Fuse/relay - Fuses and Relays though they are small parts but plays very important role in smooth functioning of your vehicle, so, make sure to replace them if discover faulty.
3. Pin/connector - Make sure the Pin/ connector should not be corroded and have broken lock tab because these could become the main factor creating Code P024B.
4. Bypass Control Circuit - Always have a check on bypass control circuit to avoid major problems with your costly vehicles else you will end up spending a lot. If this discovered inoperative, repair or replace as required.

Below are the common symptoms for the code P024B. If you experience below mentioned symptoms please bring your vehicle to a reputable repair facility. If neglected it could develop into something much more serious fairly quickly.

• Lack of boost from the turbo/supercharger
• Vehicle invading into limp mode
• Misfiring of engine
• Illuminated check engine light
• educed fuel pressure
• Inclined exhaust
• Bad engine performance

This trouble code is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model. Keep the below mentioned points in mind while fixing this code.

• It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.
• Disconnect the valve, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.
• Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

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 P024B.

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The step by step analysis and diagnosis is recommended by a qualified technician using high grade diagnostic tools to check for all the problems and solving them. This may require the tools like OBD code reader; Hose clamp pliers, Lubricant, Multimeter, Basic socket, wrench, ratchet and screwdriver set, Battery terminal cleaner etc.

• First of all, inspect for any obvious physical damage to the charge air cooler bypass control valve and make sure engine is off.
• Inspect if there are any obstructions in the valve’s range of motion by simply removing it completely and clean it completely before reinstalling.
• Observe the wires closely which are involved within the circuit. Those should not have nicks, cuts or signs of corrosion. Make sure to disconnect battery before performing any electrical repairs.
• Inspect carefully the mechanical operation of the valve itself, if you find the valve sticking and there is nothing obstructing it, it means the valve it defective.
• Verify the integrity of the circuit by performing numerous basic electrical tests.
• There is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the P Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.

Common Mistakes When Diagnosing the P024B Code

There are some tips and advices which one should keep in mind while fixing this error code to avoid inviting any further problems. Usually, people make mistakes like they forget to switch off the engine before troubleshooting. So, please let the engine cool first and disconnect the battery before performing any electrical repair. Please wear Personal protective equipment and always verify and record the integrity of your battery and charging system before further troubleshooting