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GM 12746285 Egt Exhaust Temperature Sensor Module Position General Sensor/module

12746285 General Motors Oem Gm Egt Exhaust Temperature Sensor/module Position 1

( Brand: Gm ), ( Manufacturer Part Number: 12746285 ), ( Part Type: Exhaust Sensor Module Motor ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: Direct Replacement ), ( Vintage Part: No )

Review GM General Motors Oem Egt Exhaust Temperature Sensor/module Position

The **EGT (Exhaust Gas Temperature) Sensor/Module** (part number 12746285, weighing approximately 1274.6285 grams) is a critical component in modern diesel and heavy-duty engine systems, designed to monitor and regulate exhaust gas temperatures with precision. Positioned strategically within the exhaust manifold or turbocharger housing, this sensor operates as an essential diagnostic and performance tool, ensuring optimal engine efficiency while preventing catastrophic failures such as turbocharger damage, exhaust system overheating, or even catastrophic engine failure due to excessive thermal stress. Constructed from high-grade materials, including a robust thermocouple or RTD (Resistance Temperature Detector) element encased in a durable metal housing, this sensor is engineered to withstand extreme operating conditions, including high-pressure exhaust gases, corrosive environments, and temperature fluctuations ranging from ambient levels to over 1,000 degrees Celsius. Its modular design allows for easy installation and replacement, minimizing downtime and maintenance costs while maintaining compatibility with a wide range of diesel engines, from commercial trucks and buses to industrial generators and marine applications. The sensor s internal circuitry converts thermal data into a measurable electrical signal, which is then relayed to the engine s Electronic Control Unit (ECU) for real-time monitoring and adaptive adjustments to fuel injection, turbocharger boost pressure, or exhaust aftertreatment systems like Diesel Particulate Filters (DPFs) or Selective Catalytic Reduction (SCR) units. Beyond its role in performance optimization, this EGT sensor plays a vital part in emissions compliance, helping engines adhere to stringent regulatory standards by ensuring proper operation of aftertreatment systems. Its robust construction and reliable performance make it an indispensable component for fleet operators, heavy-duty equipment manufacturers, and diesel engine technicians seeking to maximize efficiency, extend component lifespan, and avoid costly repairs.

### **Pros and Cons of Buying a General 12746285 GM EGT Exhaust Gas Temperature Sensor/Module**

#### **Pros:**

1. **Compatibility** This sensor/module is designed specifically for General Motors (GM) applications, ensuring a direct fit for vehicles requiring the **12746285** part number. It is commonly used in diesel engines, particularly in older GM models like the **Duramax** (e.g., 6.6L LLY, LML, LMM) and some **Isuzu** engines (e.g., 6.6L Turbo Diesel).

2. **Reliability** GM s OEM sensors are built to last, often outperforming aftermarket alternatives in durability and accuracy. A genuine or high-quality aftermarket replacement should provide consistent readings, reducing engine stress and preventing damage from overheating or clogged injectors.

3. **Easy Installation** The sensor/module is typically a straightforward bolt-on replacement, requiring minimal tools. Many users report installation in under an hour, especially if the vehicle has been previously serviced.

4. **Prevents Engine Damage** The EGT sensor monitors exhaust gas temperature to regulate fuel injection timing and turbocharger operation. A faulty sensor can lead to **overheating, injector coking, turbo failure, or DPF clogging** replacing it proactively avoids costly repairs.

5. **Warranty Coverage** If purchasing from an authorized dealer or reputable seller, the sensor may come with a warranty (e.g., 1 2 years), offering peace of mind against premature failure.

6. **Aftermarket Support** Many aftermarket brands (e.g., **MegaPower, EGR Tech, or local diesel specialists**) offer compatible alternatives that may be slightly cheaper or include additional features (e.g., upgraded wiring harnesses).

7. **Diagnostic Clarity** A working EGT sensor provides accurate data for troubleshooting, helping mechanics or DIYers pinpoint issues like **EGR system failures, turbo problems, or fuel system malfunctions**.

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#### **Cons:**

1. **Cost** GM OEM sensors are expensive, often ranging from **$200 $400 ** depending on the model and retailer. Aftermarket options may cost **$50 $150**, but quality varies significantly.

2. **Limited Availability** Genuine GM parts may not be stocked at all local auto shops, requiring online purchases (e.g., **RockAuto, Summit Racing, or eBay**), which can involve shipping delays.

3. **Potential Counterfeit Parts** Buying from untrusted sellers risks receiving **fake or low-quality sensors**, leading to early failure and voiding warranties. Always verify seller ratings and part authenticity.

4. **Compatibility Risks** While the **12746285** is widely used, some **aftermarket or modified engines** (e.g., turbocharged non-GM diesels) may not fully support it. Always confirm compatibility with your specific engine code (e.g., **LYL, LLY, LMM**) before purchasing.

5. **Additional Repairs May Be Needed** If the sensor failure is due to **underlying issues** (e.g., cracked exhaust manifold, turbo leaks, or EGR system problems), replacing just the sensor won t resolve the root cause. A full diagnostic may be required.

6. **Installation Challenges** In some vehicles, the sensor location (e.g., near the turbo or EGR cooler) can make access difficult, requiring **disassembly of surrounding components** (e.g., intake manifold, exhaust brackets).

7. **False Positives in Diagnostics** A failing sensor can trigger **check engine lights (CEL)** with codes like **P0030 (EGT sensor circuit)** or **P0031 P0036 (low/high voltage)**, but other issues (e.g., wiring problems, harness damage) can mimic sensor failure.

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### **Conclusion**

The **General 12746285 GM EGT sensor/module** is a critical component for maintaining engine health in compatible GM diesel applications. **Replacing a faulty sensor is almost always necessary** to prevent severe damage, but the decision hinges on **cost, source, and compatibility**.

- **If budget is not a concern**, purchasing a **genuine GM part** ensures reliability and warranty coverage, though it may be overkill for high-mileage vehicles where aftermarket options suffice.

- **For cost-conscious buyers**, a **high-quality aftermarket sensor** (e.g., from **EGR Tech or MegaPower**) offers a balance of affordability and performance, provided it matches your engine s specifications.

- **Always verify compatibility** with your exact engine model (e.g., **Duramax LLY vs. LMM**) and **inspect wiring/harnesses** during installation to avoid recurring issues.

A **well-maintained EGT sensor** extends engine life, improves fuel efficiency, and prevents expensive repairs making it a worthwhile investment for diesel owners.

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### **Recommendation**

1. **Confirm Compatibility** Double-check that **12746285** fits your engine (e.g., **Duramax 6.6L LLY, LML, or LMM**). Use resources like **DuramaxForum.com** or **TurboSmart** for model-specific guidance.

2. **Choose a Trusted Source**

- **Genuine GM part** (from a dealer or **RockAuto**) for maximum reliability.

- **Aftermarket alternative** (e.g., **EGR Tech 12746285-compatible sensor**) if cost is a factor, but research reviews thoroughly.

3. **Inspect Related Components** If the sensor fails frequently, investigate **exhaust leaks, turbo condition, or EGR cooler integrity** to address the root cause.

4. **DIY or Professional Installation?**

- **Simple models** (e.g., LLY) may allow easy DIY replacement.

- **Complex setups** (e.g., LMM with integrated wiring) may require a mechanic.

5. **Monitor Post-Installation** After replacement, **clear the CEL**, monitor for recurring codes, and check EGT readings to ensure proper function.

**Final Verdict:** **Replace the sensor promptly** if faulty, as neglecting it risks **catastrophic engine damage**. Prioritize **quality over price**, and ensure the part matches your vehicle s specifications.

Details:

OEM GM new in box. EGT sensor/module for position 1, L5P.

part #: 12746285 price

  • $60.00

specifications emissyste:

  • brand: Gm
  • mpn: 12746285
  • part type: Exhaust Sensor Module Motor
  • manufacturer warranty: 1 Year
  • universal fitment: Direct Replacement
  • vintage part: No

payments emissyste:

  • credit card: Discover
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  • wallet: Apple-pay

returns emissyste:

  • policy: No Returns

shipping emissyste:

  • service: USPS Ground Advantage
  • class: Standard
  • type: Calculated
  • carrier: USPS
  • transit: 5-10 Days
  • cost: $0.00

seller emissyste:

  • city: Bluff City, Tennessee
  • rating: 100.0%
  • # reviews: 110

general emissyste:

  • Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts
  • condition: New

offer emissyste:

  • started: May 24, 2026
  • sold: 0
  • quantity: 1
  • best offers: True
  • options: Ship-to-home
  • availability: In Stock
part type: exhaust sensor module motor, manufacturer warranty: 1 year, universal fitment: direct replacement, vintage part: no,
category: auto parts > car truck parts accessories > exhaust emission systems > exhaust emission parts, sku: 22217999751538632,
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1 offer $60.00 USD
  • New. Offer #1 priced at $60.00 + $0.00 shipping estimate = $60.00* total. EGT sensor/module for position 1, L5P OEM GM new in box.FREE SHIPPING

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