P2487 — Exhaust Gas Temperature Sensor Circuit High #

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

• Exhaust Gas Temperature Sensor Circuit High Input (Ford, GM, Chrysler)
• EGT Sensor Circuit High Voltage (Toyota, Volkswagen)
• Exhaust Gas Temp Sensor High Signal (Mercedes-Benz, BMW)
• EGT Sensor High Input Bank 1/2 (Nissan, Subaru)

Summary of Code P2487 #

The P2487 code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a voltage signal from the Exhaust Gas Temperature (EGT) sensor that is higher than the expected range. The EGT sensor measures the temperature of the exhaust gases to help optimize emissions, turbocharger protection, and aftertreatment system efficiency. A “circuit high” condition usually means the sensor is reporting a value outside of the normal operating range, often due to a wiring or sensor issue. This code is most commonly found on diesel engines but may also appear on certain gasoline models equipped with exhaust temperature monitoring. Prompt diagnosis is recommended to prevent potential damage to expensive exhaust components.

Common Symptoms for Code P2487 #

When P2487 is active, you may notice a variety of symptoms depending on your vehicle and driving conditions. Some vehicles will trigger a check engine light (CEL), while others may enter a reduced power mode to protect the exhaust system. It’s possible for the vehicle to operate with minimal noticeable issues, but ignoring the code can lead to more severe problems over time.

• Illuminated Check Engine Light (CEL)
• Possible “limp” or reduced power mode
• Decreased fuel efficiency
• Regeneration issues with Diesel Particulate Filter (DPF), if equipped
• Unusual exhaust odor or increased emissions
• In rare cases, warning messages related to exhaust temperature or aftertreatment system

Most Likely Causes of Code P2487 #

Like a detective piecing together clues, pinpointing the exact cause of a P2487 code relies on methodical testing. The root cause can range from simple wiring faults to a failed sensor. Below is a list of the most common causes, ordered from most to least frequent based on typical OEM experience.

1. Faulty Exhaust Gas Temperature Sensor (internal short or open circuit)
2. Damaged wiring or poor electrical connections (corrosion, broken wires, loose pins at connectors)
3. Excessive exhaust temperature (less common, typically caused by engine or aftertreatment malfunctions)
4. Failed PCM/ECM (rare, but possible if other causes are ruled out)

Step-by-Step Diagnosis for Code P2487 #

Diagnosing a P2487 is much like troubleshooting a home appliance — check the simple things first, then move on to more complex possibilities. Follow these steps to accurately identify the root cause:

• Verify the code and clear it with a scan tool; see if it returns after a drive cycle.
• Perform a visual inspection of the EGT sensor wiring and connectors for damage, corrosion, or loose connections.
• Check the sensor harness for continuity and proper voltage using a digital multimeter.
• Compare live data from the EGT sensor to OEM specifications using a scan tool; look for implausible or fixed readings.
• If possible, test the sensor directly by measuring resistance at room temperature and after heating (refer to OEM specs).
• If all wiring and the sensor test good, consider PCM/ECM diagnostics (rare scenario).

Possible Repairs for Code P2487 #

Repairs should address the root cause to prevent recurrence. Once you’ve identified the culprit, you can proceed with confidence. Here are the most common repairs associated with P2487:

• Replace the faulty EGT sensor with a genuine or high-quality aftermarket part.
• Repair or replace damaged wiring, corroded connectors, or loose terminal pins.
• Address any underlying engine issues causing excessive exhaust temperatures (e.g., turbo or DPF malfunctions).
• In rare cases, reflash or replace the PCM/ECM if a confirmed internal fault is present.

Is It Safe to Drive With Code P2487? #

Generally, it is not recommended to continue driving with code P2487 active for an extended period. While your vehicle may still run, a faulty EGT sensor can prevent proper operation of emissions systems, especially on diesel engines with DPF or Selective Catalytic Reduction (SCR) systems. This can lead to increased emissions, potential engine or exhaust damage, and failure to regenerate the DPF. If the vehicle enters a reduced power mode, further driving may be limited. Have the problem diagnosed and repaired as soon as possible to avoid costly damage.

Vehicles Most Commonly Affected by Code P2487 #

This code appears most often on vehicles equipped with advanced emissions systems, particularly turbocharged diesels. However, some gasoline engines may also use EGT sensors. The following models are frequently associated with P2487 events:

• Ford Super Duty trucks (Power Stroke diesel engines)
• Chevrolet Silverado/GMC Sierra (Duramax diesel)
• Dodge Ram (Cummins diesel)
• Volkswagen/Audi TDI models
• Mercedes-Benz BlueTEC diesels
• BMW diesel models
• Nissan Titan XD (Cummins diesel)

Frequent Mistakes & Best Practices for Code P2487 #

Misdiagnosis is common with P2487, especially if the technician overlooks the basics. Avoid these pitfalls by sticking to a logical process and using quality parts. Here’s what to watch for:

• Replacing the EGT sensor without checking wiring or connectors for faults.
• Ignoring live data readings; always compare sensor output to OEM specs.
• Skipping a visual inspection — many issues are visible to the trained eye.
• Using low-quality aftermarket sensors that may not meet OEM standards.
• Neglecting to clear the code and verify repair effectiveness after service.

FAQ Express — Code P2487 #

Q: Can a bad EGT sensor damage my engine?
A: While a failed EGT sensor won’t directly harm your engine, it can prevent proper operation of emissions systems, leading to overheating of exhaust components or DPF failure if not addressed promptly.

Q: Will replacing the EGT sensor always fix P2487?
A: Not always. While the sensor is the most common culprit, wiring faults or connector issues are also frequent causes. Always perform a complete diagnosis before replacing parts.