P247D — Exhaust Gas Temperature Out of Range #

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

• Exhaust Gas Temperature Sensor Out of Range (Ford)
• Exhaust Gas Temp Out of Range (GM/Chevrolet)
• Exhaust Gas Temperature Out of Expected Range (Dodge/RAM)
• Exhaust Gas Temp Out of Specification (Toyota)

Summary of the P247D Code #

The P247D diagnostic trouble code (DTC) signals that the engine control module (ECM) or powertrain control module (PCM) has detected an exhaust gas temperature (EGT) sensor reading outside of the expected range. The EGT sensor is critical for monitoring exhaust heat, especially in vehicles equipped with diesel particulate filters (DPF) or advanced emission control devices. This code typically indicates a problem with the sensor, its circuit, or related exhaust components. If ignored, abnormal exhaust temperature readings can impact system performance, emissions, and even engine longevity. Quick and accurate diagnosis is essential to avoid further complications or regulatory non-compliance.

Common Symptoms for Code P247D #

When P247D is present, symptoms can range from subtle to immediately noticeable. The vehicle’s computer may trigger warning lights, change engine behavior, or even limit certain functions to protect critical components. Here are the most frequent signs:

• Check Engine Light (CEL) illuminated
• Reduced engine power or limp mode
• Poor fuel economy
• Increased exhaust smoke (especially on diesels)
• Active or pending DPF regeneration failures
• Abnormal exhaust odor or heat levels

Most Likely Causes for Code P247D #

The majority of P247D cases stem from sensor or wiring faults, but related exhaust or ECM issues can also be at play. Causes are listed below, ordered from most to least common:

1. Failed or degraded exhaust gas temperature sensor
2. Open, short, or corroded wiring/connectors in the EGT sensor circuit
3. Excessive exhaust temperature due to DPF or turbocharger malfunction
4. Faulty ECM/PCM readings or software calibration issue
5. Physical exhaust leaks near the temperature sensor

Step-by-Step Diagnostic Process for P247D #

Diagnosing P247D requires a systematic approach, starting with the basics and advancing to more technical checks. Here’s a proven step-by-step process:

• 1. Verify the code: Use an OBD-II scanner to confirm P247D and check for related codes.
• 2. Inspect the EGT sensor and wiring: Look for melted, broken, or corroded wires and connectors.
• 3. Test sensor resistance: Unplug the EGT sensor and measure its resistance with a multimeter. Compare with OEM specifications.
• 4. Backprobe sensor circuit: Check for voltage supply and signal integrity from the ECM/PCM.
• 5. Monitor live data: With a scan tool, observe EGT readings during warm-up and operation. Look for erratic or implausible values.
• 6. Check for exhaust leaks or DPF/turbo issues: Visually inspect the exhaust system near the sensor.
• 7. Clear codes and retest: After repairs, clear the code and verify that it does not return under normal driving.

Possible Repairs for Code P247D #

Once the root cause is determined, select the appropriate repair action. Each repair directly addresses one or more of the likely causes:

• Replace the exhaust gas temperature sensor if it is faulty or out of specification.
• Repair or replace damaged wiring/connectors in the sensor circuit.
• Fix any exhaust leaks near the EGT sensor location.
• Address DPF or turbocharger issues causing abnormal exhaust temperatures.
• Update or reflash the ECM/PCM if a software/calibration issue is identified (as per OEM TSBs).

Can You Drive with Code P247D? #

Limited: While it is technically possible to drive with P247D, it is not recommended. Incorrect exhaust temperature readings can disrupt emission system function, trigger limp mode, or prevent vital processes like DPF regeneration. Prolonged driving may lead to further damage, increased emissions, or costly repairs. Address the issue as soon as possible.

Vehicles Most Commonly Affected by P247D #

The P247D code is more frequently reported in diesel-powered vehicles with advanced exhaust aftertreatment systems. It can also appear in certain gasoline vehicles equipped with EGT sensors, especially those with turbochargers or performance exhausts. The most commonly affected models include:

• Ford Super Duty (F-250, F-350, F-450, F-550)
• Chevrolet Silverado/GMC Sierra (Duramax diesel)
• RAM 2500/3500/4500/5500 (Cummins diesel)
• Volkswagen/Audi TDI models
• Toyota Hilux and Land Cruiser (diesel)
• Mercedes-Benz Sprinter (BlueTEC diesel)

Frequent Mistakes & Best Practices for P247D #

Misdiagnosis of P247D is common, typically due to overlooking wiring issues or replacing the sensor prematurely. Here are pitfalls to avoid and golden rules to follow:

• Don’t replace the sensor before inspecting wiring and connectors; many issues are due to electrical faults.
• Never ignore related codes; additional DTCs may point to the actual root cause (such as DPF or turbo problems).
• Always use genuine or OEM-quality replacement sensors to ensure compatibility and accuracy.
• Consult OEM technical service bulletins (TSBs) for known issues or software updates.
• Reset and road test after repairs to confirm the issue is fully resolved.

Express FAQ for P247D #

Here are quick answers to the most common questions about P247D:

• Q: Will P247D cause my engine to run poorly?
  A: It can, especially if the system enters limp mode or disables emission controls. Some drivers may notice little difference, but others experience reduced power or fuel economy.
• Q: Can I clear the code and keep driving?
  A: You can clear the code, but if the fault remains, it will return. It’s best to diagnose and repair the underlying issue to avoid long-term damage.