Technical Description of OBD-II Trouble Code
The exhaust gas temperature of Bank 2 Sensor 2 is out of range.
What does that mean?
This is a generic diagnostic trouble code (DTC) that applies to many OBD-II vehicles (1996-newer), including Ford, VW Volkswagen, Audi, Porsche, Chevy, Nissan, and more. The exact repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
OBD-II trouble code P247D is associated with the exhaust gas temperature circuit of Bank 2 Sensor 2. When the Engine Control Unit (ECU) detects improper signals within this circuit, code P247D will be set and the check engine light will illuminate. To determine the appropriate bank and sensor location for your specific vehicle, refer to a vehicle-specific resource.
The exhaust gas temperature sensor monitors the temperature of the exhaust gases and converts it into a voltage signal that is sent to the ECU. The ECU uses this input to control engine conditions and reduce emissions. It adjusts ignition timing or the air/fuel mixture to lower the exhaust gas temperature and protect the catalytic converter. Exhaust gas temperature sensors are found in diesel engines, gasoline burning engines, and turbocharged engines. This process also improves performance and fuel economy.
A typical EGT exhaust gas temperature sensor:
What is the severity of this DTC?
The severity of this code can vary greatly. It can range from just an illuminated check engine light on a vehicle that starts and runs to a vehicle that may stall or not start at all.
What are some of the symptoms of the code?
Symptoms of a P247D trouble code may include:
What are some of the common causes of the code?
Causes for this P247D code may include:
What are some P247D troubleshooting steps?
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB’s) for the specific vehicle by year, model, and power plant. This can save time by pointing you in the right direction.
The second step is to visually inspect all components within this circuit. Check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burn spots. Next, check the connectors for security, corrosion, and damaged pins. The exhaust gas temperature sensor is typically a 2-wire sensor located in the exhaust down pipe. Remove the exhaust gas temperature sensor to inspect for excessive carbon buildup. Also, identify any possible exhaust leaks.
Advanced Steps
The advanced steps are vehicle-specific and require advanced equipment for accurate performance. These procedures require a digital multimeter and specific technical references for the vehicle. An infrared thermometer and a heat gun can be useful tools if available. Voltage requirements will vary based on the specific year and model of the vehicle.
Voltage Checks
The voltage output of the exhaust gas temperature sensor should vary proportionally to temperature changes. If the voltage stays the same or changes rapidly, it indicates that the exhaust gas temperature sensor needs replacement.
If a power source or ground is absent, continuity testing may be required to check the integrity of the wiring, connectors, and other components. Continuity tests should always be performed with the power removed from the circuit, and the normal readings for wiring and connections should be 0 ohms of resistance. Resistance or no continuity indicates faulty wiring that is open or shorted and must be repaired or replaced. The resistance level of the exhaust gas temperature sensor should vary proportionally to temperature increases and decreases. A heat gun can be used to perform a bench check of this component. There are two types of exhaust gas temperature sensors: negative temperature coefficient and positive temperature coefficient. A negative temperature coefficient sensor has high resistance at low temperature and low resistance at high temperature. A positive temperature coefficient sensor has low resistance at low temperature and high resistance at high temperature.
What are some common repairs for this code?
Common mistakes may include:
Replacing the ECU or the exhaust gas temperature sensor when damaged wiring or another component is the issue. O2 sensors are also commonly mistaken as an exhaust gas temperature sensor.
We always recommend seeking professional service to mechanically solve this issue. However, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will still be addressed. If you are interested in this option, please upload your ECU file to our portal.
