Pontiac G5 2007-2010 Engine Camshaft Position Sensor Replacement Guide
Fix your G5's stalling, rough idle, or starting problems by understanding its camshaft position sensors.
- Your 2007-2010 Pontiac G5 has two camshaft position sensors (intake and exhaust) that often fail, causing stalling and rough idling.
- Replacement is very easy for a DIYer, requiring only a 10mm socket and about 30 minutes.
- While codes P0340/P0341 usually mean a bad sensor, you should also check the wiring and connector.
- For best results, use a premium aftermarket brand like ACDelco, Delphi, or Standard Ignition and consider replacing both sensors at once.
Is Your Pontiac G5 Stalling or Running Rough?
A failing camshaft position sensor is a common issue on the 2007-2010 Pontiac G5. These sensors tell your engine's computer when to fire the spark plugs and inject fuel. When one goes bad, your car might have trouble starting, stall unexpectedly, or run poorly. This guide will help you choose the right aftermarket replacement for your G5.
Symptoms of a Failing Camshaft Position Sensor
The signs of a bad camshaft sensor can range from annoying to serious. The most common symptom is the Check Engine Light coming on. You might also experience:
- Engine Stalling: The engine may shut off while idling or driving.
- Hard Starting: The car may take longer than usual to start, or it might not start at all.
- Rough Idle: The engine may shake or 'chug' when the car is stopped.
- Poor Acceleration: You might notice a loss of power when you press the gas pedal.
- Reduced Fuel Economy: A bad sensor can cause the engine to use more gas than normal.
A check engine light with codes P0340 or P0341 often points to a problem with the camshaft position sensor circuit. However, these codes don't automatically mean the sensor is bad. The problem could also be damaged wiring, a bad connection, or even a stretched timing chain. Always inspect the wiring and connector before replacing the part.
Choosing the Right Aftermarket Sensor
Not all aftermarket sensors are created equal. For a critical part like this, quality matters. Here’s a breakdown of the brands available, grouped into tiers based on reputation for GM vehicles.
Tier 1: OEM & Premium Aftermarket
These brands are either the original equipment manufacturer (OEM) or have a long-standing reputation for quality that meets or exceeds OEM standards. They are the most reliable choice.
- ACDelco: As GM's own parts brand, this is often the exact same part that your car was built with. It's the benchmark for quality and fit.
- Delphi: Delphi was originally a part of GM and a major OEM supplier. Their sensors are widely considered to be of the same quality as ACDelco.
- Standard Ignition (SMP): A highly respected aftermarket brand known for producing reliable electronic parts and sensors for over 100 years.
Tier 2: Quality Aftermarket
These brands offer a good balance of price and quality. They are a solid choice for most repairs.
- Dorman: Dorman is known for making a huge variety of aftermarket parts. While some products get mixed reviews, their sensors are generally a reliable and cost-effective solution.
- Hitachi: A well-known manufacturer of electronic components, Hitachi sensors are a dependable option.
- NGK: While famous for spark plugs, NGK also produces a line of high-quality sensors.
- Walker Products: A long-time manufacturer of fuel and engine management components with a solid reputation.
Tier 3: Value Brands
These brands focus on providing the most affordable options. They can be a good choice for budget-conscious repairs, but may not have the same longevity as premium brands.
- Global Parts
- Holstein
- Prenco
- Spectra
- True Tech
- URO Parts
Your Pontiac G5 has two camshaft position sensors (intake and exhaust). If one has failed due to age and mileage, the other is likely not far behind. To save yourself from doing the job twice, it's a good practice to replace both sensors at the same time.
Cost of Replacing Pontiac G5 Camshaft Position Sensors
The replacement cost depends on whether you do it yourself or go to a repair shop. The job is very easy and accessible, making it a great DIY task.
| Part / Service | Estimated Cost |
|---|---|
| New OEM Sensor (Each) | $40 - $95 |
| New Aftermarket Sensor (Each) | $24 - $68 |
| Shop Labor | $60 - $90 |
| Total DIY Cost (2 Aftermarket Sensors) | $48 - $136 |
| Total Shop Cost (2 Aftermarket Sensors) | $108 - $226 |
Frequently Asked Questions
How many camshaft sensors does my 2007-2010 G5 have?
Your Pontiac G5 has two camshaft position sensors. One is for the intake camshaft and the other is for the exhaust camshaft. They are separate parts.
Where are the camshaft sensors located?
Both sensors are located on the passenger side of the engine, on the end of the cylinder head. You can access them by removing the plastic engine cover. Each sensor is held in by a single 10mm bolt.
Is this a difficult job to do myself?
No, this is considered a very easy repair. Basic hand tools (a ratchet and 10mm socket) are all that's needed. The entire job for both sensors can be done in under 30 minutes.
What happens if I don't replace a bad sensor?
You should not ignore a failing camshaft position sensor. The problem will likely get worse, leading to more frequent stalling, which can be dangerous while driving. It can also cause damage to other components, like the catalytic converter, over time.
Do I need to reset the computer after replacing the sensor?
After replacing the sensor(s), the check engine light should turn off on its own after a few drive cycles. You can also clear the code immediately with a basic OBD-II scan tool or by disconnecting the battery for about 15 minutes.
Technical Specifications
OEM Part Numbers: 12577245 12674704
The 2.2L and 2.4L Ecotec engines in the 2007-2010 Pontiac G5 use two separate 3-pin camshaft position sensors, one for the intake cam and one for the exhaust cam.
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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.
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