P247B - Exhaust Gas Temperature Out of Range Sensor Bank 1

Introduction

The DTC P247B trouble code is an important warning sign for auto repair technicians, as it indicates a problem with the exhaust gas temperature (EGT) sensor on Bank 1 of the engine. This code is often associated with exhaust system malfunctions, which can affect vehicle performance and emissions. Understanding the implications of this code and how to address it is essential to ensure effective repair.

In this article, we will explore the symptoms, causes, diagnosis, and repair procedures associated with the DTC P247B code. From understanding the components involved to troubleshooting the problem, we will provide a comprehensive framework to help auto repairers deal with this issue.

Symptoms

When DTC code P247B occurs, drivers may notice various symptoms, including:

  • Check Engine Light comes on
  • Reduced engine performance
  • Increased fuel consumption
  • Increase in polluting emissions
  • In some cases, the vehicle may enter emergency mode or "limp mode"

It is important not to ignore these signs, as they can indicate more serious problems in the exhaust system and engine management.

Cause

Causes of the DTC code P247B can vary and include:

  • EGT Sensor Malfunction :
    The sensor itself may be faulty or damaged, leading to incorrect exhaust gas temperature readings.

  • Wiring problems :
    Damaged wires, short circuits, or loose connections can affect the operation of the EGT sensor.

  • Engine overheating :
    If the engine is operating at higher than normal temperatures, this could affect the EGT sensor readings.

  • Exhaust system problems :
    Restrictions in the exhaust system, such as clogged catalytic converters or defects in the exhaust system, can affect exhaust gas temperatures.

  • Engine control unit (ECU) problems :
    A malfunctioning ECU may not correctly interpret the data provided by the EGT sensor.

Diagnosis

Diagnosing DTC code P247B requires a systematic approach:

  1. OBD-II Scanner :
    Start by connecting an OBD-II scanner to confirm the presence of the DTC P247B code and check for any related codes, such as P247A or P247C.

  2. Visual inspection :
    Check the EGT sensor wiring and connections for any signs of wear or damage.

  3. Sensor Test :
    Use a multimeter to measure the resistance and input and output voltages of the EGT sensor. Compare the values to the manufacturer's specifications.

  4. Checking temperatures :
    Use a diagnostic tool to monitor exhaust gas temperatures in real time and compare them to the engine control unit readings.

  5. Exhaust system check :
    Perform a thorough check of the exhaust system for any restrictions or malfunctions.

Resolution and repair

Once the cause of the DTC code P247B has been identified, you can proceed with the repair:

  • Replacing the EGT sensor :
    If the sensor is faulty, replace it with a new one, making sure it is compatible with the vehicle model.

  • Wiring Repair :
    If any damaged cables are found, repair or replace them, making sure the connections are secure and free of corrosion.

  • Troubleshooting overheating issues :
    If your engine is overheating, identify and resolve the cause, which could be due to a leak in the cooling system or a faulty thermostat.

  • Exhaust system check :
    If there are restrictions in the system, such as a clogged catalytic converter, proceed with cleaning or replacing the affected components.

  • ECU Reset :
    After repairs are made, you may need to reset the engine control unit using diagnostic software to clear the DTC code and restore factory settings.

Insight into the components involved

EGT Sensor and Engine Control Unit

The exhaust gas temperature (EGT) sensor is a crucial component in monitoring engine performance and emissions. It is located in the exhaust system and measures the temperature of the exhaust gases. This information is sent to the engine control unit (ECU), which uses it to optimize fuel mixture and ignition, ensuring efficient performance and reducing emissions.

The engine control unit, on the other hand, is the brain of the vehicle, responsible for managing various aspects of the engine, including fuel injection and ignition timing. Malfunctions in any of these components can drastically affect the vehicle's performance and emissions.

Conclusions

DTC P247B presents a significant challenge to auto mechanics, but with accurate diagnosis and effective resolution, you can restore your vehicle’s performance and ensure compliance with emissions regulations. It is critical to pay attention to the symptoms and causes associated with this code, to address the problem promptly and efficiently. Understanding the components involved is equally important, as proper diagnosis and repair can prevent future damage and ensure your vehicle continues to operate at peak performance.

Important
Not all OBD2 codes used by one manufacturer are used by other brands, and may not have the same meaning.
The information presented here is for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any concerns about repairing your vehicle, please contact your repair shop.