P247F — Exhaust Gas Temperature Out of Range #

Note: The code description may vary depending on the vehicle manufacturer (OEM).

• Exhaust Gas Temperature Out of Range (General, multiple OEMs)
• Exhaust Gas Temperature Sensor Out of Range (Ford)
• Exhaust Gas Temperature Too High/Low (Toyota)
• EGT Sensor Value Out of Specification (Volkswagen/Audi)

Summary of DTC P247F #

The P247F diagnostic trouble code (DTC) indicates that the engine control module (ECM) has detected an exhaust gas temperature reading that is outside the expected range. The exhaust gas temperature sensor (EGT sensor) is responsible for monitoring the temperature of gases leaving the engine, critical for the management of aftertreatment systems like the diesel particulate filter (DPF). If the sensor signals a value that is either too high or too low compared to factory thresholds, the ECM logs this code to alert of a potential issue. This can be triggered by sensor faults, wiring issues, or actual engine conditions. Failure to address this warning can lead to improper emission control and, in certain cases, damage to aftertreatment components.

Common Symptoms for Code P247F #

When P247F is present, you may notice changes in vehicle behavior, although sometimes the symptoms can be subtle or delayed. Modern vehicles often respond to EGT anomalies by adjusting fuel delivery or entering a reduced power mode to protect critical components. Be alert for these signs:

• Illuminated Check Engine Light (CEL)
• Activation of limp mode (reduced power)
• Noticeable loss of engine performance
• Increased fuel consumption
• Difficulty in completing DPF regeneration cycles (for diesel vehicles)
• Occasional exhaust smoke (if regeneration is interrupted)

Likely Causes for Code P247F #

This code is most frequently the result of sensor-related problems, but may also indicate broader issues within the exhaust or emissions system. Here is a prioritized list of the most probable causes:

1. Faulty exhaust gas temperature sensor (sensor failure or drift)
2. Damaged or corroded wiring/connectors related to the EGT sensor
3. Exhaust leaks near the sensor location
4. Failed DPF or catalytic converter (rare, but possible if the temperature is genuinely out of range)
5. ECM/PCM software issues (incorrect threshold logic or false positives)

Step-by-Step Diagnostic for P247F #

A methodical approach is key to pinpointing the root cause of P247F. Start by confirming the presence of the code, then systematically check each component in the circuit:

• Verify the code with a reliable OBD-II scan tool and review any freeze frame data.
• Visually inspect the EGT sensor and its wiring harness for signs of damage, corrosion, or disconnection.
• Check the sensor’s resistance with a multimeter (compare against OEM specifications).
• Test for proper voltage supply and ground at the sensor connector.
• If possible, use live data to monitor the EGT sensor readings while the engine is running and warming up.
• Examine the exhaust system for leaks, especially near the sensor location.
• If all tests pass, consider possible ECM/PCM updates or malfunctions.

Possible Repairs for P247F #

The right repair depends on which cause is confirmed during diagnosis. Address the most common and accessible issues first before considering major parts replacement. Typical repairs include:

• Replacing the exhaust gas temperature sensor if found faulty or out of spec
• Repairing or replacing wiring and connectors affected by corrosion, damage, or loose contacts
• Fixing any exhaust leaks near the sensor
• Replacing a DPF or catalytic converter if diagnosed as failed (less common)
• Updating or reprogramming the ECM/PCM with the latest OEM software, if applicable

Is It Safe to Drive with Code P247F? #

Driving with code P247F should be considered limited and temporary only. While some vehicles may continue to operate with minor symptoms, ignoring this code can lead to further issues. If the exhaust temperature is genuinely out of range, critical emissions components such as the DPF or catalytic converter may suffer irreversible damage. In diesel engines, repeated failure to perform DPF regeneration can eventually clog the filter, causing engine performance loss or even a no-start condition. Address this code as soon as possible to avoid costly repairs.

Vehicles Most Commonly Affected by P247F #

While P247F can appear on any vehicle equipped with exhaust gas temperature sensors—especially modern diesels—it is most frequently reported on certain models. These often include vehicles with advanced emission systems or those known for DPF-related issues:

• Ford Super Duty (F-Series Diesel, especially with 6.7L Power Stroke)
• Volkswagen/Audi TDI models
• Chevrolet Silverado/GMC Sierra Duramax Diesel
• Toyota Hilux and Land Cruiser Diesel
• RAM 2500/3500 with Cummins Diesel

Common Mistakes & Best Practices with P247F #

Misdiagnosis is a common pitfall with P247F, primarily due to overlooking simple faults or rushing to replace expensive components. To avoid wasted time and money, keep these tips in mind:

• Don’t replace the DPF or catalytic converter without confirming EGT sensor and wiring integrity.
• Always compare live sensor data with OEM reference values before condemning the sensor.
• Check for TSBs (Technical Service Bulletins) related to P247F for your specific OEM—some issues are software-related.
• Never ignore exhaust leaks—they can cause false temperature readings and other codes.
• After repairs, always clear the code and verify that it does not return after a test drive and a full warm-up cycle.

Quick FAQ about P247F #

Here are answers to some of the most frequent questions regarding DTC P247F:

• Q: Can a bad EGT sensor cause a failed emissions test?
  A: Yes, because the ECM may not properly manage aftertreatment systems if it receives inaccurate temperature readings, increasing emissions.
• Q: Is P247F more common in cold climates?
  A: Sensor wiring and connectors can be more susceptible to corrosion and damage in harsh climates, which may increase the frequency of this code.