P247C — Exhaust Gas Temperature Out of Range #

Note: The wording of this fault code may differ depending on your vehicle’s manufacturer. Always refer to your OEM (Original Equipment Manufacturer) documentation for precise definitions.

Known Label Variations:

• Exhaust Gas Temperature Sensor Out of Range (Ford, GM, FCA/Stellantis)
• Exhaust Gas Temperature Sensor Circuit Range/Performance (Volkswagen/Audi, BMW)
• EGT Sensor Out of Range (Toyota, Nissan)

Summary of DTC P247C #

P247C is a generic OBD-II trouble code indicating that the exhaust gas temperature (EGT) sensor is reporting a value that is outside of the expected range set by the OEM. This sensor monitors the temperature of exhaust gases, providing critical data for the engine control module (ECM) to optimize emissions and protect components like the turbocharger or diesel particulate filter (DPF). If the sensor reads too high or too low, the ECM logs this code to warn of a potential sensor fault, wiring problem, or abnormal exhaust condition. While often flagged by diesel vehicles with advanced emission controls, it may also occur in gasoline vehicles using EGT sensors for performance monitoring. Prompt attention is important, as unresolved EGT faults can lead to emission failures or even damage to engine and exhaust components.

Common Symptoms for Code P247C #

Drivers may notice a range of symptoms when the P247C code is active. Sometimes, the vehicle operates normally, but in other cases, drivability or emission system performance can suffer. Watch out for:

• Illuminated Check Engine Light or Malfunction Indicator Lamp (MIL)
• Warning messages related to emissions or exhaust temperature
• Reduced engine power (limp mode) in some vehicles
• Increased fuel consumption
• Difficulty passing emissions testing
• Regeneration issues on diesel vehicles with DPF systems

Probable Causes for Code P247C #

The most common reasons for the P247C code, ranked by likelihood, include:

1. Faulty EGT sensor: Sensor malfunction due to age, contamination, or internal failure.
2. Damaged wiring or connectors: Corroded, broken, or shorted wires leading to incorrect sensor readings.
3. Exhaust leaks: Leaks near the sensor affecting temperature readings.
4. ECM/PCM software issues: Rarely, a control module may require an update or reprogramming.
5. Unusual exhaust conditions: Extended idling, excessive soot, or upstream component failures (e.g., turbocharger, DPF).

Step-by-Step Diagnostic for Code P247C #

To accurately diagnose P247C, follow this structured approach. Proper tools include a quality scan tool, digital multimeter, and basic hand tools. Here’s how a professional technician would proceed:

• Use a scan tool to confirm the presence of P247C and note any additional codes.
• Inspect exhaust gas temperature sensor wiring and connectors for signs of corrosion, damage, or disconnection.
• Compare live EGT sensor readings to OEM specifications at key engine temperatures. Look for readings stuck at minimum or maximum values.
• Perform a resistance test on the EGT sensor using a digital multimeter. Replace sensor if values are out of specification (see OEM repair manual).
• Check for exhaust leaks or physical damage near the sensor location.
• Clear codes and perform a road test to see if P247C returns.
• If all hardware checks out, consider updating or reprogramming the ECM/PCM as per OEM bulletins.

Possible Repairs for Code P247C #

After diagnosis, repair options should directly address the underlying cause. Depending on findings, the following fixes may be needed:

• Replace faulty EGT sensor: Install a new OEM or quality aftermarket sensor if readings are out of range.
• Repair or replace damaged wiring/connectors: Solder, insulate, or replace as required for clean, secure connections.
• Fix exhaust leaks: Reseal or weld leaks near the EGT sensor mounting point.
• Update/reprogram ECM: Perform software updates if recommended by the manufacturer.

Can You Drive With Code P247C? #

Limited: While many vehicles will continue to run with the P247C code, it’s not advisable to ignore it. In some cases, your vehicle may enter limp mode, restricting power to prevent damage. More importantly, incorrect EGT readings can lead to increased emissions, DPF issues, or even severe engine damage if left unresolved. It’s best to address the issue as soon as possible to avoid costly repairs and ensure compliance with emissions regulations.

Vehicles Most Commonly Affected by Code P247C #

This code is most frequently observed in modern diesel vehicles equipped with aftertreatment systems, but it can appear in some gasoline engines as well. Vehicles where P247C is often reported include:

• Ford Super Duty (F-250/F-350, 6.7L Power Stroke Diesel)
• Chevrolet Silverado/GMC Sierra (Duramax Diesel)
• RAM 2500/3500 (Cummins Diesel)
• Volkswagen/Audi TDI models
• BMW diesel models
• Toyota and Nissan light commercial vehicles with diesel engines

Common Mistakes & Best Practices for Code P247C #

Misdiagnosis can lead to wasted time and money. Here’s what to avoid, and how to get it right:

• Replacing the EGT sensor without checking for wiring or connector issues first.
• Overlooking exhaust leaks that skew temperature readings.
• Ignoring OEM service bulletins that may address software or calibration issues.
• Using non-OEM sensors that don’t match original specifications.
• Not clearing codes and verifying repair with a thorough road test.

Quick FAQ for Code P247C #

Q: Will a faulty EGT sensor damage my engine?
A: While a failed EGT sensor itself won’t directly harm your engine, it can cause poor emission control, potential DPF clogging, and—in severe cases—lead to overheating or turbocharger damage if ignored.

Q: Is it safe to replace an EGT sensor myself?
A: If you’re comfortable working around the hot exhaust system and have access to proper tools, DIY replacement is possible. Always follow OEM procedures, and ensure the engine is cool before starting.