P2478 OBD Error Code: Problem & Solutions

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Are you experiencing a significant reduction in engine performance accompanied by a leaking exhaust? Is your vehicle exhaust system emitting excessive smoke? If your answer is YES, then chances are that your vehicle is set to OBD error code P2478. Now, you must be wondering what is this P2478 code? What does it means? Well to get your answers to all the questions you will need to go through our subsequent sections.

As some of us already know that the car’s PCM is meant to monitor the EGT sensor to make sure that it is working as desired and there exists proper circuit continuity. OBD error code P2478 will be set by your vehicle’s pcm hen it detects that the egt sensor bank 1 sensor 1 is out of factory specifications. To know more about this error code, take a look at the sections below.

What causes this problem with the Exhaust Gas Temperature Out of Range Bank 1 Sensor 1?

• Exhaust Gas Temperature bank 1 sensor 1 being faulty
• Exhaust Gas Temperature bank 1 sensor 1 wires or harnesses being open or shorted
• Exhaust Gas Temperature bank 1 sensor 1 poor electrical connection
• A possible exhaust leakage
• Sensor developing excessive particulate matter buildup

1. Powertrain Control Module - Error code P2478 flashing? Yes? Then you must check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
2. Catalytic Converter - Looking for catalytic converters? Well, now is the time you get new ones for your car with us at PartsAvatar and get your part at best prices online.
3. Exhaust Gas Temperature Sensor - Well, this is one of most important gauges on a turbo-diesel-powered vehicle and you can’t really go a long way with a defective one. You can buy one with us for all make and models on the Canadian road.
4. Diesel Particulate Filter - You definitely need to avoid increased vehicle’s emissions and occurence of OBD error code P2478, replace the faulty diesel particulate system and parts today. Replace the faulty ones today and say bye bye to OBD error code P2478.
5. Engine Control Module - Having problems with your car’s engine control module, also known as the ECM is rare, but if you happen to face it then its recommended to undergo a complete reprogramming of the system to avoid wrong codes from getting stored in the system, leading to misdiagnosis. Replace the damaged ones with us today.
6. Engine Control Unit - Defective engine control units can cause issues like fall in fuel efficiency and poor engine perf

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2478 here:

Common Symptoms

• Engine stalling
• No start condition
• Poor fuel efficiency
• Fall in engine performance
• Flashing of check engine light

Here are some ways with the help of which you will be able to correct the OBD Code P2478.

• Start by fixing the exhaust gas temperature sensor
• Fix or replace blown fuse or fuse-able link
• Remember to clean the corrosion from connectors
• Fix or replace the poor wiring
• Clean carbon buildup from sensor
• Fix the exhaust leak
• Lastly, repair or replace the bad ECU

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

If you wish to diagnose this OBD error code P2478, then you will need to look for the technical service bulletins, also known as the TSB’s specific to your vehicle make model and year. This will save you a lot of time and will guide you in the right direction. Find and locate all the parts within the exhaust gas temperature circuit and undergo a complete visual inspection to make sure there are no defects such as scraping, rubbing, bare wires or burn spots. After this you will need to inspect all the related connectors for any corrosion or defective pins. For those who don’t know this already, the exhaust gas temperature sensor is generally a 2-wire sensor located in your vehicle’s exhaust down pipe. Last but not the least remove the exhaust gas temperature and check for any carbon buildup. Also, check for any fuel injector or exhaust leakage.

Common Mistakes When Diagnosing The P2478 Code

If you are going to diagnose your vehicle for OBD error code P2478, then make sure that you avoid the following errors

• Bad EGT sensor
• Defective powertrain control module (PCM)
• Damaged wiring