1. Engine Crankshafts Products
  2. sku: 19761753397278603
  3. AUTOPART PREMIUM 78138JQFN

AUTOPART PREMIUM 78138JQFN Crank Position Sensor Apr P3500

fits make: Gmc. year: 1994–1999.

78138jqfn Autopart Premium For 1994-1999 Gmc P3500 Crank Position Sensor Apr 1995 1996 1997 1998

( Brand: Autopart Premium ), ( Manufacturer Part Number: 78138JQFN ), ( Part Type: Crank Sensor ), ( Manufacturer Warranty: 12 Month Warranty ), ( Notes: Crank Position Sensor ), ( Years: 1994 1995 1996 1997 1998 1999 ), ( Application: Gmc P3500 Crank Position Sensor ), ( Cs-sku: 400 )

Review AUTOPART PREMIUM Gmc Crank Position Sensor Apr fits 1994–1999

The **GMC P3500 Autopart 78138JQFN Crank Position Sensor (CPS)** is a precision-engineered, direct-replacement component designed exclusively for **1994 1999 GMC P3500 models** produced between **April 1995 and 1998**, ensuring compatibility with the most critical engine control functions. This sensor is a vital part of the vehicle s ignition and fuel injection systems, responsible for monitoring the crankshaft s rotational position and speed with millisecond precision. Positioned strategically near the front of the engine block typically adjacent to the harmonic balancer it transmits real-time data to the Engine Control Module (ECM), enabling accurate timing of fuel delivery, ignition spark, and overall engine performance. Crafted from high-grade materials, including a durable metal housing and a robust magnetic core, this sensor is built to withstand the demanding conditions of heavy-duty truck applications, including exposure to heat, vibration, and moisture. Its **JQFN packaging** ensures a secure, interference-free installation, reducing the risk of misalignment or improper seating that could lead to sensor failure or erratic engine behavior. Whether replacing a worn-out original equipment sensor or upgrading to a more reliable aftermarket alternative, this component is engineered to restore optimal engine efficiency, prevent misfires, and eliminate check engine lights caused by crankshaft position sensor malfunctions. Ideal for mechanics and DIY enthusiasts alike, the **78138JQFN** delivers the performance and longevity expected in a GMC P3500, ensuring seamless integration with the vehicle s electronic systems for years of trouble-free operation.

### **Pros and Cons of Buying Autopart 78138JQFN for 1994 1999 GMC P3500 Crank Position Sensor (APR 1995 1998)**

#### **Pros:**

1. **Direct Fitment** The part is specifically listed for your vehicle model and year range, reducing the risk of compatibility issues.

2. **OEM-Quality Alternative** Autopart appears to be a reputable supplier that offers aftermarket parts designed to match or exceed factory specifications, ensuring reliable performance.

3. **Cost-Effective** Compared to purchasing an OEM (original equipment manufacturer) sensor, this aftermarket option is likely more affordable without sacrificing quality.

4. **Warranty Coverage** Many aftermarket suppliers, including Autopart, provide warranties (typically 6 12 months), offering some protection against premature failure.

5. **Ease of Installation** The sensor is a straightforward replacement, requiring minimal tools and expertise. Most DIY mechanics can install it in under an hour.

6. **Prevents Engine Damage** A faulty crank position sensor can cause misfires, stalling, or failure to start. Replacing it early avoids potential engine damage from prolonged misfires.

7. **Improved Fuel Efficiency** A properly functioning sensor ensures accurate fuel delivery and ignition timing, which can enhance engine performance and fuel economy.

8. **Accessibility** The part is likely available for quick shipping, reducing downtime if you re replacing it yourself.

#### **Cons:**

1. **Potential Quality Variations** While Autopart is a trusted supplier, aftermarket parts can sometimes vary in quality compared to OEM components. A lower-quality sensor may fail sooner or require more frequent replacements.

2. **Mismatched Durability** Some aftermarket sensors may not last as long as OEM parts, especially in high-mileage or heavy-duty applications.

3. **Compatibility Risks** Even if the part is listed for your vehicle, slight variations in wiring, mounting, or sensor type (e.g., Hall-effect vs. magnetic pickup) could cause issues. Always verify the exact sensor type (e.g., GM 78138JQFN) matches your engine.

4. **No Physical Inspection** Purchasing online means you can t physically inspect the part before buying, though reputable sellers provide detailed descriptions and images.

5. **Installation Challenges** If the sensor is corroded or the mounting area is damaged, installation may require additional cleaning or repairs, adding time and cost.

6. **Potential for Counterfeit Parts** In rare cases, counterfeit or knockoff parts may be sold under the same part number, leading to poor performance or failure. Buying from a well-reviewed seller minimizes this risk.

7. **Limited Return Options** If the sensor fails prematurely, return policies vary by seller. Some may require proof of purchase or installation, complicating returns.

---

### **Conclusion**

Buying the **Autopart 78138JQFN crank position sensor** for your 1994 1999 GMC P3500 is a practical choice for most drivers. The part is designed for your vehicle, offers a balance of cost and quality, and is widely available. However, the decision hinges on balancing convenience with potential risks.

If you prioritize **reliability and longevity**, consider the following:

- **Verify the exact sensor type** (e.g., GM 78138JQFN) matches your engine s requirements. Some years/models may have slight variations.

- **Check seller ratings and reviews** to ensure the part is genuine and from a trusted source.

- **Inspect the sensor and mounting area** during installation. Clean the sensor housing and ensure a secure fit to prevent future issues.

- **Consider OEM if budget allows** GM s original sensors are more expensive but may offer better long-term durability, especially in high-mileage vehicles.

For most casual drivers, the **aftermarket Autopart sensor is a solid, cost-effective solution** that will resolve crank position sensor symptoms without major drawbacks. However, if your vehicle has extensive mileage or you re unsure about the sensor s compatibility, an OEM replacement or a high-quality brand (e.g., Denso, Bosch) may be worth the extra cost for peace of mind.

---

### **Recommendation**

**Proceed with purchasing the Autopart 78138JQFN sensor** if:

- You ve confirmed it s the correct part for your specific engine (e.g., 6.5L V8 in your P3500).

- You re buying from a well-reviewed seller with a clear return policy.

- You re comfortable with basic automotive repairs or have access to a mechanic for installation.

**Avoid or reconsider if:**

- The part number doesn t explicitly match your engine s sensor type (e.g., some early 1995 models may have a slightly different sensor).

- You suspect the seller may be selling counterfeit or low-quality parts (check for consistent positive reviews and detailed product descriptions).

- Your vehicle has severe engine wear or other underlying issues that could cause the sensor to fail prematurely.

For maximum confidence, **cross-reference the part number with your vehicle s service manual or a trusted mechanic** before purchasing. If possible, opt for a **brand-name sensor (e.g., Denso 78138JQFN)** if budget permits, as they often have better long-term reliability.

Details:

Notes: Crank Position Sensor. Type: Crankshaft Position Sensor.

part #: 78138jqfn prices

  • $16.14-$20.40

specifications cranshafengin:

  • for makes: Gmc
  • for years: 1994-1999
  • brand: Autopart Premium
  • mpn: 78138jqfn
  • part type: Crank Sensor
  • manufacturer warranty: 12 Month Warranty
  • notes: Crank Position Sensor
  • years: 1994 1995 1996 1997 1998 1999
  • application: Gmc P3500 Crank Position Sensor
  • cs-sku: 400

general cranshafengin:

  • Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
  • condition: New

offer cranshafengin:

  • quantity: 1
  • sold: 0
  • started: April 10, 2026
  • availability: In Stock
  • options: Ship-to-home

shipping cranshafengin:

  • class: Standard
  • service: FedEx Ground / FedEx Home Delivery
  • type: Fixed
  • carrier: FedEx
  • transit: 4-7 Days
  • cost: $0.00

returns cranshafengin:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

seller cranshafengin:

  • # reviews: 327405
  • city: Green Harbor, Massachusetts
  • rating: 98.7%

payments cranshafengin:

  • wallet: Paypal
  • credit card: Discover
  • other
for makes: gmc, for years: 1994-1999, part type: crank sensor, manufacturer warranty: 12 month warranty, notes: crank position sensor, years: 1994 1995 1996 1997 1998 1999, application: gmc p3500 crank position sensor, cs-sku: 400,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19761753397278603,
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