P247A — Exhaust Gas Temperature Out of Range #

Note: The definition of code P247A may vary between manufacturers. Always refer to OEM documentation for precise wording.

• Exhaust Gas Temperature Out of Range (Generic/SAE)
• Exhaust Gas Temp Sensor Out of Range (Ford)
• Exhaust Gas Temperature Sensor Circuit Range/Performance (GM)
• EGT Sensor Out of Range (Toyota)

Summary of code P247A #

P247A is an OBD-II diagnostic trouble code (DTC) that indicates the exhaust gas temperature has moved outside the expected range as measured by the vehicle’s exhaust gas temperature sensor (EGT sensor). This sensor monitors the temperature of gases leaving the engine and is critical for monitoring the health of emission control systems such as the diesel particulate filter (DPF) and catalytic converter. An out-of-range signal means the temperature is either too high or too low for safe and efficient operation, potentially triggering limp mode or other protective measures. This code can appear in both gasoline and diesel vehicles, but it is especially common in modern diesel engines equipped with emission aftertreatment systems. While the code itself rarely indicates immediate danger, it should not be ignored, as unresolved temperature issues can cause major emission system or engine problems over time.

Frequent symptoms for code P247A #

When P247A is stored, you may notice changes in your vehicle’s performance, especially under heavy load or during emission system regeneration cycles. Symptoms can range from mild to severe, depending on whether the temperature is too low or too high and how the engine management system responds.

• Illuminated Check Engine Light or Service Engine Soon indicator
• Reduced engine power or limp mode activation
• Poor fuel economy
• Unusual exhaust smell or visible smoke
• Difficulty completing DPF regeneration (in diesels)
• Hard starting or hesitation during acceleration

Probable causes for code P247A #

The most common causes of P247A relate to the sensor itself or its associated wiring, but failures elsewhere in the exhaust or emission system can also be responsible. Always consider the most frequent causes first when beginning diagnosis.

1. Faulty exhaust gas temperature sensor (EGT sensor failure)
2. Damaged, shorted, or corroded EGT sensor wiring or connector
3. Excessive soot or contamination on the sensor tip
4. Exhaust leaks near the sensor location
5. Failed or malfunctioning engine control module (ECM/PCM)
6. Issues with emission system components (e.g., DPF, catalytic converter)

Step-by-step diagnosis for code P247A #

Diagnosing P247A requires a systematic approach to avoid replacing unnecessary parts. A digital multimeter, scan tool with live data, and sometimes an infrared thermometer are essential for accurate troubleshooting.

• Use a scan tool to confirm the presence of P247A and check for related codes.
• Visually inspect the EGT sensor and wiring for signs of damage, corrosion, or disconnection.
• Check the connector for bent pins or moisture intrusion.
• Read live EGT sensor data and compare it to ambient temperature (with a cold engine) and expected values during operation.
• Test the EGT sensor’s resistance with a multimeter; compare readings to OEM specs.
• If readings are abnormal, temporarily swap the suspect sensor with another (if possible) to see if the fault follows.
• Inspect the exhaust near the sensor for leaks or heavy soot buildup.
• If all checks out, consider ECM or emissions component faults, and follow OEM troubleshooting flowcharts.

Possible repairs for code P247A #

Repairs for P247A should always address the root cause confirmed during diagnosis. Quick fixes often lead to recurring issues, so thorough testing is advised.

• Replace the defective EGT sensor with an OEM or high-quality aftermarket unit.
• Repair or replace damaged EGT sensor wiring or connectors.
• Clean soot or contaminants from the sensor and exhaust (if accessible and safe).
• Seal any exhaust leaks near the sensor installation point.
• If necessary, update or reflash the engine control module as per OEM technical service bulletins.
• Replace or service emission components (DPF, catalytic converter) if found defective.

Is it safe to drive with code P247A? #

Limited — Caution recommended. While it’s usually possible to drive short distances with P247A, continued operation may lead to further damage, especially if the code is paired with symptoms like limp mode or excessive smoke. In diesel vehicles, unresolved EGT sensor issues can interrupt DPF regeneration, leading to severe clogging or emission system failure. If performance is significantly reduced, or if you hear unusual noises from the exhaust, it’s best to have the vehicle inspected as soon as possible.

Vehicles most commonly affected by code P247A #

P247A is seen across many makes and models, but is more common in modern diesel vehicles with advanced emission controls. The following manufacturers and models are frequently associated with this code:

• Ford Super Duty (F-250, F-350, F-450 with Power Stroke diesel)
• Chevrolet Silverado/GMC Sierra Duramax diesel
• Dodge/Ram Cummins diesel trucks
• Toyota Land Cruiser and Hilux diesel
• Volkswagen/Audi TDI models
• Various heavy-duty commercial vehicles (Isuzu, Mercedes-Benz Sprinter, etc.)

Common mistakes & best practices for code P247A #

Technicians and DIYers alike can fall into common traps when diagnosing or repairing P247A. Avoiding these errors will save time, money, and frustration.

• Replacing the EGT sensor before inspecting wiring or connectors for damage
• Ignoring related codes that may point to broader emission system problems
• Neglecting to clear soot or debris that can affect sensor accuracy
• Using non-OEM sensors that may provide inaccurate readings
• Failing to perform a complete emission system check after repair

Express FAQ for code P247A #

Here are answers to some quick questions vehicle owners and techs often ask about P247A:

• Q: Can a bad battery or voltage drop cause P247A?
• A: Rarely, but severe voltage issues can disrupt sensor signals. Always check battery and charging system health if multiple unrelated codes are present.
• Q: Will replacing the EGT sensor always fix P247A?
• A: Not always — be sure to inspect wiring, connectors, and related exhaust components. If the code returns after sensor replacement, look for exhaust leaks or ECM issues.