Error Code P040D: What It Means & What To Do?

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This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

The trouble code P040D can be described as Exhaust Gas Recirculation Temperature Sensor 'A' Circuit High.

If you want to learn something more about P040D trouble code, then you have arrived at the right place. A lot of unburned fuel was wasted and expelled into the atmosphere by the car engine before the introduction of the exhaust gas recirculation system to the vehicles in the 1970’s. But now the system has changed as vehicle should now have a certain emission rating so that it can proceed with the production.

What causes this problem with the Exhaust Gas Recirculation Temperature Sensor “A” Circuit High?

• The wiring harness or sensor might be burnt
• Exhaust gas recirculation temperature Sensor 'A' harness might be opened or shorted
• There can be bad electrical connection in the exhaust gas recirculation temperature Sensor 'A' circuit
• There can be some faults in the wires
• Flaws in the connector
• There can be some defects in the exhaust gas recirculation temperature sensor
• Leakage in the EGR temperature sensor gasket
• Issue of cracked or leaking exhaust pipe in which the sensor is mounted
• Engine control module might have some issues
• Bad connections
• Quirks in the exhaust gas recirculation temperature sensor 'A'

1. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P040D code appearing over and over again. Visit us to buy best quality PCM online.
2. Coolant Temperature Sensor - A lot of issues can arise do to defective Coolant Temperature Sensor. Did you just see P040D code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Fuel Temperature Sensor - Faulty Fuel Temperature Sensor can be the reason why P040D code is flashing. Visit us to purchase top notch Fuel Temperature Sensor online.
4. Ambient Air Temperature Sensor - It is an important auto part which needs full care. A faulty Ambient Air Temperature Sensor can be a reason behind the flashing up of P040D code.
5. Engine Control Module - OBD Code P040D can appear because of faulty Engine Control Module.
6. Throttle Position Sensor - There can be some issues with the Throttle Position Sensor due to which you may see P040D code appearing over and over again. Visit us to buy best quality Throttle Position Sensor online.
7. EGR Valve Gasket - Are you facing some faults in your EGR Valve Gasket? Don’t worry and get them replaced or else P040D code can turn up.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The smog or emissions state might start failing
• Engine noises like knocking, rattling, pinging, etc can start appearing
• Engine Light ON can start flashing
• Problem of louder exhaust
• There can be a lot of exhaust smells

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Replace or repair the exhaust gas recirculation temperature sensor
• It is important to repair the flawed wires
• Repair the quirky connector carefully
• You can always replace the faulty engine control module
• Make sure to repair the connections
• Leakage in the EGR temperature sensor gasket should be corrected properly

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of egr valve cleaner, egr system, egr sensor, radiator leak sealant, egr cleaner and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

Step 1

• First of all, you must check by visually inspecting the sensor and surrounding EGR system, looking for exhaust leaks in particular. Also check out the sensor and its harness. Remember that high temps can cause havoc on plastic and rubber insulated wires so inspect them thoroughly. Keep in mind that the black soot may indicate an exhaust leak around the area

Step 2

• A lot of EGR issues have been caused due to accumulated soot in the exhaust potentially caused by a number of things (poor maintenance, low quality fuel etc.)
• In this case, it is not an exception, so it can be a good idea to clean your EGR system or at the very least the temperature sensor. Be aware that sensors mounted within the exhaust systems may feel like they are seized when trying to unfasten
• Just remember that these sensors are subject to substantial temperature fluctuations, so a bit of heat using an Oxyacetylene torch (not for the layman) may help loosen the sensor
• Now once you have removed the sensor use carburetor cleaner or similar product to effectively soak the soot. Use a wire brush to loosen soot in any overly accumulated areas. When you are reinstalling the clean sensor, make sure to apply some anti-seize to the threads to aid in preventing seizing

Step 3

• Verify the integrity of the sensor by measuring actual electrical values compared to manufacturer specific desired values. This can be done by using a Multimeter and following manufacturer specific pin-out test procedures

P040C - Exhaust Gas Recirculation Temperature Sensor "A" Circuit Low