P049D - OBD Trouble Code

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This OBD code is one of the most common amongst vehicles. The Exhaust Gas Recirculation or EGR systems in a vehicle main function is to reduce the combustion temperature of the engine. EGR technology hence helps in reducing NOx emissions by the engine. If the Powertrain Control Module PCM of the car detects inefficient operation of the EGR, it will set code P049D

Recently build vehicles have an EGR system that uses a step motor to manage the flow rate of emissions from the exhaust manifold. This motor will typically have four winding phases. It crucially operates according to the output pulse signal sent from the Engine control module or ECM. Two windings out the four are turned On and Off consecutively in sequence. Every time the on pulse is released, the valve opens and closes, bringing about change in the flow rate. Where there is no requirement of the flow rate change, the ECM doesn’t let out the pulse signal. For the valve to remain at that particular opening a specific voltage signal is issued.

What causes this problem with Exhaust Gas Recirculation "A" Control Position Exceeded Learning Limit?

• Defect in the EGR valve
• Clogged EGR Carbon passage/s
• A Collapse or crack in the DPFE hoses
• Malfunctioning DPFE, MAP, or MAT Sensor
• Open or shorted circuits connecting to the EGR valve/sensors related to it

1. Exhaust Gas Recirculation - A diesel engines important part, which control the NOx emissions. It is very important that the EGR works well, if it is underperforming, you may have to consider repairing it or replace it all together.
2. EGR Valve - A faulty valve can cause tremendous damage to the EGR and its parts. Buy first-rate quality EGR Valve from Parts Avatar online.
3. Engine Control Module - Also known as PCM, is the CPU of your car. Ensure that it is of the best quality, replace it at Parts Avatar we provide free shipping for orders over CAD $99.
4. Vacuum Switching Valve - The VSV is responsible for controlling any air bleed into the engine manifold. Hence it is very important that it functions smoothly. Check if repairing can fix the VSV, if not, you can simply order online on Parts Avatar.
5. EGR Solenoid - A malfunctioning EGR can not only cause OBD error P049D but can also raise other concerns for your vehicle’s quality of performance. You deserve the best, and Parts Avatar provides superior quality replacement parts, so you don’t have to compromise on quality.
6. EGR Vacuum - Incompetence of the EGR vacuum will substantially increase the issue of the EGR. Check for repairs or replacement requirement.
7. Exhaust manifold - This is where all the exhaust gasses get collected. If it is not functioning as required, choose either repairing or replacement as an option.

Having the OBD Code P049F and unable to understand the symptoms of it? Parts Avatar has simplified it and noted the common symptoms for your reference:

• Noticeable reduction in the performance of engine.
• Increase in the consumption of fuel by vehicle 

Here’s the one way you can resolve the OBD Code P049D in your vehicle

• Complete replacement of the EGR

Don’t worry about where to find trustworthy car parts that are of good quality and compatible with your vehicle. Parts Avatar has you covered, find yours today!

You can use these simple steps to diagnose this OBD Code:

• Begin by locating the vehicle diagnostic connector. Retrieve the codes stored with the scanner and ensure all the information is recorded. This will help you when diagnosis is needed in the future.
• Test-drive your vehicle and observe if the code is immediately reset or not.
• You can also refer your vehicles technical service bulletins (TSB) to figure out solutions for your EGR system problems. TSB entries are a reliable source, as they are formulated by references and help from thousands of repair specialists. The list is such that you can match your code to the specific vehicle, and symptoms exhibited thereof.
• If the OBD Code P049B is stored after clearing the codes, use a diagnostic scanner, a DVOM and a reliable source of information for your specific vehicle.
• The EGR valve and related wiring and connectors will then have to be visually inspected. While observing, pay attention on the wiring harnesses which are connected near the hot exhaust manifold and jagged edges associated with exhaust shields. Make note of any damages to them.

Common Mistakes When Diagnosing the P049D Code

These are few common mistakes committed during diagnosis that you can avoid:

• Failure of the EGR valve
• Failure of the Powertrain Control Module
• Issue in the wiring