2007 GMC Sierra 3500 Classic Engine Camshaft Position Sensor Replacement Guide
Diagnose and choose the right replacement camshaft position sensor for your 2007 Sierra 3500 Classic's specific engine.
- First, positively identify your engine (6.0L, 8.1L, or 6.6L) as the part and replacement difficulty vary greatly.
- For the 6.0L V8, be prepared for a difficult repair that may involve removing the intake manifold.
- Due to the critical nature of this sensor, choosing a premium brand like ACDelco, Delphi, or NTK is highly recommended.
- A flashing check engine light is a sign of a severe misfire; pull over and shut off the engine to prevent catalytic converter damage.
Is Your Sierra 3500 Classic Running Rough? It Could Be the Camshaft Position Sensor
If your truck is experiencing issues like a check engine light, difficulty starting, or sudden stalling, a failing camshaft position sensor might be the culprit. This sensor is vital for engine timing, and when it fails, it can cause a range of noticeable problems. Because the 2007 Sierra 3500 Classic was offered with three different engines, the replacement process can vary from simple to complex.
Symptoms of a Failing Camshaft Position Sensor
Watch for these common signs of a bad cam sensor in your Sierra:
- Check Engine Light: This is often the first indicator. You may see codes like P0340, P0341, P0342, or P0343.
- Engine Stalling: The engine may stall unexpectedly while driving or at idle.
- Hard Starting or No-Start: The truck may crank for a long time before starting, or it may not start at all.
- Rough Idle and Misfires: A faulty sensor sends bad data, leading to incorrect timing, which can make the engine run rough or misfire.
- Reduced Engine Power: Your truck may feel sluggish and lack acceleration.
- Poor Fuel Economy: Inefficient engine timing from a bad sensor can cause your truck to burn more fuel.
Critical: Identify Your Engine Before Buying
The location of the camshaft position sensor and the difficulty of replacement depend entirely on which engine your 2007 Sierra 3500 Classic has. The parts are not interchangeable.
- 6.0L V8 Vortec: The sensor is located at the top rear of the engine block, behind the intake manifold. This is a very difficult location to access and may require removing the entire intake manifold, making it a lengthy and complex job.
- 8.1L V8 Vortec: The sensor is located on the front of the engine, behind the timing cover. Access is much easier than on the 6.0L.
- 6.6L V8 Duramax Diesel: The sensor is typically located on the driver's side of the engine block, below the high-pressure fuel pump. Access is moderate.
Choosing the Right Aftermarket Camshaft Sensor
While a dealership can provide an OEM part, the aftermarket offers a wide range of quality options, often at a better price. For a critical sensor like this, it's best to stick with reputable brands.
Tier 1: OEM and Premium Aftermarket Brands
These brands are either the original equipment manufacturer or are known for producing parts that meet or exceed OEM quality. They are the top choice for reliability and longevity.
- ACDelco: As the genuine GM parts brand, this is the original part your truck was built with. Many ACDelco parts are now sold as "GM Genuine Parts."
- Delphi: Delphi was an original part of GM and is a major OEM supplier for sensors and electronics. Their parts are widely considered to be of equal quality to ACDelco.
- Hitachi: A well-respected Japanese manufacturer known for high-quality electronic components and sensors.
- NGK / NTK: While famous for spark plugs, NTK (an NGK company) is a leading sensor manufacturer with a reputation for excellent quality and reliability.
Tier 2: Quality Aftermarket Brands
These brands offer a good balance of quality and value. They are reliable choices for daily drivers and are often more affordable than premium brands.
- Standard Motor Products (SMP): A long-standing aftermarket manufacturer that produces reliable sensors.
- Dorman: Known for producing a vast catalog of replacement parts. While some reviews mention fitment issues, they often provide cost-effective solutions and sometimes redesign parts to improve on OEM weaknesses.
- Walker Products: A US-based company that has been making engine management components for decades.
- Spectra Premium: A Canadian company known for quality fuel and engine management parts.
Tier 3: Budget-Friendly Options
These brands can save you money upfront, but may have a higher risk of premature failure or inconsistent quality. They can be a viable option for a budget repair, but for a critical sensor, a Tier 1 or Tier 2 brand is recommended for peace of mind.
- URO Parts
- Beck Arnley
- Global Parts
- Prenco / True Tech
| Part Type | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $75 - $130 |
| New Aftermarket | $27 - $111 |
| Shop Labor | $100 - $600+ |
Note on Labor Cost: The wide range in labor cost is due to the different engine configurations. Replacement on an 8.1L V8 may only take an hour, while replacement on a 6.0L V8 could take 4-5 hours if the intake manifold must be removed.
Frequently Asked Questions
Where is the camshaft position sensor located on my truck?
It depends on your engine. For the 6.0L V8, it's in a very difficult spot at the back of the engine under the intake manifold. For the 8.1L V8, it's on the front timing cover. For the 6.6L Duramax, it's on the driver's side of the engine block. Always verify your engine type before starting the repair.
Can I replace the camshaft position sensor myself?
If you have the 8.1L or 6.6L engine and basic mechanical skills, this is a feasible DIY job that can be done in about an hour. However, if you have the 6.0L V8, the job is much more advanced due to the sensor's location. It may require removing the intake manifold, which is not recommended for beginners.
What happens if I don't replace a bad camshaft sensor?
Ignoring a failing camshaft sensor can lead to more severe problems. You will experience persistent starting issues, stalling, and poor engine performance. A flashing check engine light indicates a serious misfire that can damage your catalytic converter, leading to a much more expensive repair.
Is there a recall on this part?
No, there are no active recalls for the camshaft position sensor on the 2007 GMC Sierra 3500 Classic. There was a recall for a *crankshaft* position sensor on much older 2001 models with the 8.1L engine, but it does not apply to this vehicle.
Should I buy an OEM or Aftermarket sensor?
For this specific part, a high-quality aftermarket sensor from a brand like Delphi, NTK, or Standard Motor Products offers performance and reliability comparable to the OEM ACDelco part, often at a lower cost. Given the high labor cost for the 6.0L engine, it is wise to invest in a quality part to avoid having to do the job twice.
Technical Specifications
OEM Part Numbers: 19420911 12585545 12568983 12591720
The camshaft position sensor for the 2007 GMC Sierra 3500 Classic is an engine-specific, three-pin magnetic or Hall-effect sensor that provides a digital signal to the ECM. The correct part must be selected based on whether the vehicle has the 6.0L V8, 8.1L V8, or 6.6L Duramax diesel engine.
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 3500 Classic: