Engine Camshaft Position Sensor Guide for the 2008-2016 GMC Sierra 2500 HD
Keep your Sierra's engine timing perfect by understanding and replacing a faulty camshaft position sensor.
- A failing camshaft position sensor will cause a Check Engine Light, hard starting, rough idle, and power loss.
- Diagnostic codes like P0340 and P0341 are strong indicators of a sensor or circuit problem.
- For reliability, choosing a premium aftermarket brand like ACDelco or Delphi is recommended over budget options.
- Replacement is a manageable DIY task for many owners, but access can be tight depending on the engine.
Understanding Camshaft Position Sensor Failures in Your Sierra HD
The camshaft position sensor in your 2008-2016 GMC Sierra 2500 HD is essential for engine health. It works with the crankshaft position sensor to make sure your engine runs smoothly, powerfully, and efficiently. When this sensor starts to fail, it sends bad information—or no information at all—to your truck's main computer. This can cause a variety of noticeable problems, from annoying to serious. Heat and oil leaks are common causes of sensor failure due to its location in the hot engine bay.
Key Failure Symptoms
A bad camshaft position sensor won't leave you guessing for long. The most common sign is the Check Engine Light turning on. You may also experience difficulty starting the engine, a rough idle, stalling, engine hesitation, and a noticeable loss of power or acceleration. 🎬 Watch: See these common bad camshaft sensor symptoms in action. In some cases, the truck may not start at all.
Choosing the Right Aftermarket Sensor
When replacing the camshaft position sensor, you have a choice between OEM (Original Equipment Manufacturer) and aftermarket parts. For a critical sensor like this, quality matters.
- Premium Aftermarket (e.g., ACDelco, Delphi): ACDelco is GM's own parts brand, and their "GM Genuine" or "OE" parts are the same as what your truck was built with. Delphi is another well-regarded brand that is often an OEM supplier, meaning their parts are built to factory specifications. For a critical sensor, choosing one of these brands is a safe bet for reliability and performance.
- Quality Aftermarket (e.g., Standard Ignition, NGK, Hitachi, Walker Products): These brands have a solid reputation for producing reliable electronic components that meet or exceed OE specifications. They offer a good balance of quality and price.
- Budget/Economy (e.g., Dorman, Store Brands): While brands like Dorman offer a wide range of parts at a lower price, their quality can be inconsistent for electronic sensors. While they may work, some technicians and owners report higher failure rates compared to premium brands. These might be an option if budget is the primary concern, but for a critical part, it may be a gamble.
Pro Tip: Given the importance of this sensor for engine timing, spending a little more on a premium aftermarket brand like ACDelco or Delphi can save you from future headaches and ensure your Sierra runs as it should.
Cost of Replacing the Camshaft Position Sensor
The cost can vary depending on the brand of the part and labor rates in your area. It's a relatively inexpensive part, and the labor is generally straightforward for a mechanic.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $27.24 - $110.70 |
| New OEM Part | $54 - $80 |
| Shop Labor | $166 - $243 |
| Total Professional Replacement | $220 - $323 |
Frequently Asked Questions
Where is the camshaft position sensor located on the 2008-2016 Sierra 2500 HD?
The location depends on your engine. For the 6.0L V8 gas engine, it is typically located on the front of the engine block, behind the water pump. 🎬 See this replacement walkthrough for the 6.0L V8 engine. For the 6.6L Duramax diesel, it is often found on the front of the engine, accessible from the top after removing some intake piping.
🎬 Watch: How to replace the sensor on a Duramax diesel.Can I replace this sensor myself?
Yes, this is a DIY-feasible job for someone with basic mechanical skills. The replacement involves disconnecting the battery, unplugging the electrical connector, and removing one or more bolts holding the sensor in place. Access can be tight, especially on the gas engine, but it does not typically require specialized tools.
What happens if I don't replace a failing sensor?
Continuing to drive with a bad camshaft position sensor can lead to progressively worse symptoms. You'll likely experience poor fuel economy, rough running, and stalling. In a worst-case scenario, the engine may not start at all, leaving you stranded. It can also cause long-term damage if the engine timing is severely affected.
Does a P0340 code always mean the sensor is bad?
Not always. While a faulty sensor is the most common cause, the code P0340 refers to a problem in the sensor's circuit. This could also be caused by damaged wiring, a loose connector, or, in rare cases, an issue with the engine's computer (PCM). It's always a good idea to inspect the wiring and connector for damage before replacing the sensor.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12672642 97365038 98079566
This sensor is a 3-pin hall-effect sensor that reads the rotation of the camshaft to provide a digital signal to the powertrain control module (PCM).
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- GMC Sierra 2500 HD: