P024D - OBD Trouble Code

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If you are experiencing problems like rich or lean exhaust, low fuel pressure, engine surge or hesitation upon acceleration, it signals that your vehicle might have OBD Code P024D error.

P024D Charge Air Cooler Bypass Position Sensor A Circuit Range/Performance code is set when there is a out of operational range condition within the position sensor or its circuit. This diagnostic trouble code typically applies to all OBD-II vehicles equipped with a charge air cooler.

P024D is a kind of OBD-II Diagnostic Trouble Code. OBD-II code Powertrain Control Module (PCM) failure is defined as a Charge Air Cooler Bypass Position Sensor “A” Circuit. The Powertrain Control Module (PCM) observes the Charge Air Cooler Bypass Sensor “A” Signal. The PCM sets the OBD II code when the charge air cooler bypass position sensor “A” is out of factory specifications.

The ECM illuminates the check engine light with P024D and associated codes when it monitors a condition outside of a specific range within the Intercoolers Bypass Control circuit and/ or within the sensors involved. This code may be caused by a mechanical and/or electrical fault.

What causes the problem of Charge Air Cooler Bypass Position Sensor “A” Circuit Range/Performance?

• Charge Air Cooler Bypass Position Sensor “A” failure
• Faulty IMRC actuator relay (if equipped)
• Shorted harness of Charge Air Cooler Bypass Position Sensor ‘A’
• Flawed fuse/ relay
• Faulty Pin/ Connector
• Problematic ECM
• Some aftermarket accessories and performance modifications
• Bad electrical connection

1. Damaged wiring harness - Damaged or Broken Wiring Harness could be an obstruction in bypass valve operational range of motion. So, it should be replaced for the proper functioning of your vehicle and to avoid this error code.
2. 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.
3. 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.
4. Charge Air Cooler - A charge air cooler is used to cool engine air after it has passed through a turbocharger, but before it enters the engine. The idea is to return the air to a lower temperature, for the optimum power for the combustion process within the engine. Make sure this is working fine to avoid major problems.

This issue should not be unattended as it could develop into something much more serious fairly quickly. Below are the common symptoms for the code P024D. If you experience these please bring your vehicle to a reputable repair facility.

• Lanky exhaust
• Low fuel pressure
• Engine surge
• Less power from the turbo/supercharger
• Vehicle invading “limp mode”
• Misfiring of engine
• Illuminated check engine light

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:

• Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1.
• If a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.
• With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.
• If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are created from many thousands of repairs.
• 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 P024D.

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Troubleshooting steps may differ depending upon manufacturer. A good starting point is always a technical service. Several tools may be required to successfully diagnose this code.

• First of all, try to locate your charge air cooler bypass control valve. Once it is located, inspect for any physical damage.
• 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 and harness for the bypass valve 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. In this case, you can try replacing it. Make sure the manufacturer also recommends a new valve in this case.
• Verify the integrity of the circuit by performing numerous basic electrical tests. If everything checks out, there may be some input tests you could do involving the connector at the valve to verify the ECM functionality with the valve.
• 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 P024D 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.