GMC Sierra 1500 Engine Camshaft Position Sensor Guide (2008-2014)
Experiencing stalling or a check engine light in your Sierra? A faulty camshaft position sensor could be the culprit.
- Engine stalling is a critical symptom that makes the vehicle unsafe to drive.
- For electronic sensors, sticking with OEM brands like ACDelco or Delphi is highly recommended to avoid issues.
- The sensor is known to get stuck and break during removal, potentially complicating the repair.
- Always check the wiring and connector first, as damage there can mimic sensor failure.
Is Your Sierra 1500 Showing Signs of a Bad Camshaft Position Sensor?
When the camshaft position sensor starts to fail, it sends incorrect or no data to your truck's computer. This can cause a range of noticeable problems. The most common sign is the check engine light illuminating on your dashboard. You might also experience difficulty starting the engine, where it cranks for longer than usual or fails to start at all. Other serious symptoms include the engine stalling unexpectedly while driving, a rough idle, engine misfires, and a general lack of acceleration power.
🎬 Watch: 11 symptoms of a bad sensor and how to test itWarning: Check the Wiring First
Before replacing the sensor, it's wise to inspect the wiring harness and connector. A loose connection, or wiring that is damaged by heat and vibration, can cause the exact same symptoms and trigger the same trouble codes (P0340, P0341). 🎬 See how to diagnose these specific GMC Sierra trouble codes Sometimes, simply cleaning the connector or repairing a wire is all that's needed.
Choosing the Right Aftermarket Camshaft Sensor
When it comes to electronic sensors for your Sierra, not all aftermarket brands are created equal. For a part this critical to engine operation, quality matters.
- Tier 1: OEM & OEM-Equivalent (ACDelco, Delphi)
ACDelco is General Motors' own parts brand, representing the original equipment (OE) part. Delphi was an original parts supplier for GM for many years and is widely considered to be of equivalent quality. For critical sensors, choosing one of these two brands provides the highest likelihood of a first-time fix without compatibility issues. - Tier 2: Reputable Aftermarket (Standard Ignition, NGK, Hitachi, Walker Products)
These brands are well-known in the aftermarket industry and have a long history of producing reliable electronic components. They offer a good balance of quality and price, often exceeding the quality of lesser-known, budget-oriented brands. - Tier 3: Value-Focused (Dorman, Holstein, Prenco, etc.)
Brands like Dorman offer a cost-effective solution and are widely available. However, owner and mechanic reviews are often mixed. While many have success with these parts, reports of incorrect fitment or shorter lifespans are more common compared to Tier 1 brands. They can be a viable option if budget is the primary concern, but may carry a higher risk of needing to be replaced again sooner.
Pro Tip: A Known Installation Hurdle
The camshaft position sensor on these GMT900 trucks is located on the front of the engine block, just behind the water pump. Due to heat cycles and its location, the sensor's plastic body can become extremely brittle and seize in the engine block. Many owners and mechanics report the sensor breaking during removal, leaving a piece stuck in the engine. This can turn a simple job into a very difficult one, sometimes requiring removal of the water pump to gain access to extract the broken piece. 🎬 Watch this guide on removing a broken or seized sensor Be prepared for this possibility if you are attempting the replacement yourself.
Cost of Replacing the Camshaft Position Sensor
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $27 - $65 |
| New OEM (ACDelco) Sensor | $70 - $120 |
| Shop Labor | $150 - $300 |
| Total Professional Replacement (Aftermarket) | $177 - $365 |
Note: Costs are estimates and will vary based on your location, specific vehicle configuration, and the repair shop's labor rates.
Frequently Asked Questions
Where is the camshaft position sensor located on a 2008-2014 Sierra 1500?
The sensor is located on the front of the engine block, toward the top, behind the water pump and slightly to the passenger side. It is held in place by a single bolt. Access can be tight, and on 4WD models, it may be easier to reach from underneath after removing the skid plate.
Can I replace this sensor myself?
Yes, it is possible for a DIY mechanic to replace this sensor. The process involves removing a single bolt and the electrical connector. However, due to its tight location and the high probability of the old sensor being seized and breaking during removal, the job can become very difficult. If you are not comfortable with potentially having to remove the water pump to extract a broken sensor, it may be best to leave this job to a professional.
What happens if I don't replace a bad camshaft position sensor?
Ignoring a failing camshaft position sensor can lead to worsening symptoms. Your truck may become very difficult to start, or not start at all. The most significant risk is the engine stalling while you are driving, which can happen without warning and create a dangerous situation. Continued driving can also lead to poor fuel economy and potentially damage other components like the catalytic converter over the long term.
Is an ACDelco sensor the same as the original GM part?
Yes. ACDelco is the official parts brand for General Motors. An ACDelco part labeled as "GM Original Equipment" is the same part that was installed in your Sierra at the factory. This is why it's a trusted choice for ensuring proper function and fit.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12585545 12568983
This is a 3-pin digital output hall-effect sensor that reads a 4-tooth reluctor wheel on the camshaft. It operates on a 5-volt reference signal from the ECM.
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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 1500:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Sierra 1500 Showing Signs of a Bad Camshaft Position Sensor?
- Warning: Check the Wiring First
- Choosing the Right Aftermarket Camshaft Sensor
- Pro Tip: A Known Installation Hurdle
- Cost of Replacing the Camshaft Position Sensor
- Frequently Asked Questions
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