Pontiac G8 Engine Camshaft Position Sensor Guide (2008-2009)
Fix stalling and rough idling by choosing the right camshaft position sensor for your V6 or V8 G8.
- V8 engines have one sensor on the front timing cover; V6 engines have four.
- For reliability, choose OEM (ACDelco) or premium aftermarket brands like Delphi or Bosch.
- V6 owners with codes P0016-P0019 should investigate timing chain stretch before replacing sensors.
- Symptoms include stalling, hard starts, and a rough idle, often with a Check Engine Light.
Is Your G8 Stalling or Running Rough? It Could Be a Camshaft Sensor.
A failing camshaft position sensor can cause a range of frustrating problems for your 2008-2009 Pontiac G8. These issues can appear suddenly and may include the check engine light coming on, difficulty starting the engine, unexpected stalling, and a noticeable loss of power. Because these symptoms can mimic other serious issues, it's important to properly diagnose the problem. 🎬 Watch this overview of common bad camshaft position sensor symptoms. The good news is that on the G8, this is often a straightforward and affordable repair.
Symptoms of a Bad Camshaft Position Sensor in a Pontiac G8
- Check Engine Light: This is the most common symptom. The sensor will trigger specific trouble codes, such as P0340 or P0341 for V8 engines. V6 engines may show codes like P0016, P0017, P0018, or P0019, which indicate a correlation issue between the camshafts and crankshaft.
- Difficulty Starting: The engine may crank for a long time before starting, or it may not start at all. The ECM needs the cam signal to initiate fuel and spark correctly.
- Engine Stalling: The engine may stall unexpectedly, either while idling at a stoplight or while driving. This can be a serious safety concern.
- Rough Idle and Hesitation: Your G8 might idle unevenly, vibrate, or hesitate during acceleration. This is due to incorrect ignition and fuel timing. 🎬 See seven common signs your camshaft sensor is failing.
- Reduced Fuel Economy: When the engine isn't running efficiently due to poor timing, your gas mileage will suffer.
A Note for V6 Owners: Timing Chains
The 3.6L LY7 V6 engine is known for potential timing chain stretch issues. Codes like P0016, P0017, P0018, and P0019 often point to a stretched timing chain rather than a failed sensor. If you have a V6 with these codes, it is critical to have the timing chain system inspected by a professional before simply replacing the sensors. A new sensor will not fix a mechanical timing problem.
🎬 Learn how to diagnose P0016-P0019 codes and potential timing chain stretch.Choosing the Right Aftermarket Sensor
When it comes to engine sensors, quality matters. While saving money is tempting, a cheap, low-quality sensor can fail quickly, leaving you with the same problem. For a critical part like this, it's best to stick with trusted brands.
Tier 1: OEM & Premium Aftermarket
These brands are either the original equipment manufacturer or are known for producing parts that meet or exceed OEM specifications. For the G8, this is the most recommended category.
- ACDelco: As the genuine GM parts brand, this is the original part that came with your car. Choosing ACDelco guarantees a perfect fit and original performance.
- Delphi: Delphi is a well-respected OEM supplier for many manufacturers, including GM. Their sensors are known for quality and reliability and are often identical to the ACDelco part.
Tier 2: Reputable Aftermarket Brands
These brands have a long history of producing reliable aftermarket parts and are a good alternative to more expensive OEM options.
- Bosch: A major OEM supplier worldwide, Bosch sensors are a solid choice.
- NGK/NTK: Known for their ignition components, NTK (an NGK brand) also produces high-quality sensors.
- Standard Motor Products (SMP): A long-standing brand in the aftermarket, offering a reliable product.
- Hitachi: Another OEM supplier that makes dependable sensors.
Tier 3: Economy Brands
This category includes brands like Dorman, Walker, and others. While they offer a significant cost saving, their long-term reliability can be inconsistent. These parts may be suitable for a budget repair, but for enthusiast vehicles like the G8, most owners recommend investing in a Tier 1 or Tier 2 brand to avoid doing the job twice.
Pro Tip: Check the Connector
Before ordering a new sensor, inspect the wiring and connector for any damage, corrosion, or loose pins. A TSB was issued for the V6 G8 regarding poor connections at the camshaft position sensor harness, which could cause hesitation or fluttering. Sometimes, the problem is in the connection, not the sensor itself.
Estimated Cost Comparison
| Part/Service | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $45 - $75 |
| New Aftermarket | $23.10 - $57.49 |
| Shop Labor | $50 - $120 |
Frequently Asked Questions
How many camshaft sensors does my G8 have?
It depends on your engine. V8 models (6.0L GT and 6.2L GXP) have one camshaft position sensor located on the front engine timing cover. V6 models (3.6L) have four sensors, one for each camshaft (intake and exhaust on both banks).
Is this a difficult part to replace myself?
For most DIY mechanics, this is a relatively easy job. On the V8, the sensor is on the front of the engine, held in by a single bolt. On the V6, the sensors are also accessible on the front of the cylinder heads. The main challenge can be a swollen O-ring making the old sensor difficult to remove. The estimated time is under one hour.
Are there any recalls for the camshaft position sensor?
No, there are no specific recalls for the camshaft position sensor on the 2008-2009 Pontiac G8. There was a Technical Service Bulletin (TSB) for the V6 model related to poor electrical connections to the sensor, but not for the sensor itself.
Should I replace the crankshaft position sensor at the same time?
It is not necessary. While the two sensors work together, you should only replace the part that has failed. A diagnostic scan tool can help you confirm which sensor is causing the fault code. Replacing parts that aren't broken won't solve the problem and will cost you extra money.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12591720 12674704 213-3826 12636947
The sensor is a 3-pin magnetic hall-effect sensor that reads the position of the camshaft via a reluctor wheel. It is secured by a single bolt and sealed with an O-ring. V8 and V6 sensors are not interchangeable.
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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.
- Pontiac G8:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your G8 Stalling or Running Rough? It Could Be a Camshaft Sensor.
- Symptoms of a Bad Camshaft Position Sensor in a Pontiac G8
- A Note for V6 Owners: Timing Chains
- Choosing the Right Aftermarket Sensor
- Pro Tip: Check the Connector
- Estimated Cost Comparison
- Frequently Asked Questions
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