Cadillac CTS Engine Camshaft Position Sensor Guide (2003-2013)
Diagnose and fix stalling, rough idling, and starting problems in your 2003-2013 Cadillac CTS by understanding its camshaft position sensors.
- Most V6 CTS models from this era have four camshaft sensors; use a scan tool to identify the correct failed sensor before buying.
- Symptoms like stalling, no-start, and a rough idle are common and should be addressed quickly to avoid being stranded.
- For reliability, stick with OEM brands like ACDelco and Delphi or reputable aftermarket brands like Standard Ignition and NTK.
- Check for TSBs related to wiring issues, as the sensor connector, not the sensor itself, can sometimes be the problem.
Symptoms of a Failing Camshaft Position Sensor in a CTS
When a camshaft position sensor starts to fail on your 2003-2013 CTS, the symptoms can range from annoying to leaving you stranded. The most common sign is the Check Engine Light coming on. Other serious symptoms include the engine being hard to start or refusing to start at all, even though it cranks. You might also experience a rough or unstable idle, sudden stalling, loss of power, and slower acceleration. These issues happen because the engine's computer loses track of the precise camshaft position, leading to incorrect timing for fuel and spark.
🎬 Watch: 11 common symptoms and how to test your sensor.Don't Ignore the Signs
A failing camshaft sensor can cause your CTS to stall unexpectedly while driving, which is a significant safety risk. It's best to address the problem as soon as symptoms appear to avoid being stranded or causing further engine issues.
Choosing the Right Aftermarket Sensor
For a critical electronic part like a camshaft position sensor on a Cadillac, the quality of the replacement matters. While OEM is always an option, high-quality aftermarket brands can offer similar performance for less money. Here’s how they generally stack up:
- Premium Aftermarket (OEM-Equivalent): Brands like ACDelco GM Original Equipment and Delphi are often the original suppliers to General Motors. Choosing these brands is the closest you can get to the factory part's performance and longevity. Bosch and NGK (NTK) are also top-tier choices known for robust engineering and reliability that meets or exceeds OE standards.
- Quality Aftermarket: Brands like Standard Motor Products (Standard Ignition) and Walker Products are well-respected in the industry. They engineer their parts for durability and often test them extensively to ensure proper signal accuracy, making them a solid and reliable choice.
- Value-Oriented Aftermarket: Brands like Dorman, URO Parts, and other lower-priced options provide a functional replacement that can solve your immediate problem. However, for sensitive electronics on a CTS, the long-term reliability and precision might not match the premium brands. They can be a good choice for a budget-conscious repair, but be aware of the potential trade-offs.
A Note on V6 Engines
Most 3.6L V6 engines in the 2003-2013 CTS have four camshaft position sensors: one for the intake and one for the exhaust camshaft on each cylinder bank. A diagnostic scan tool is needed to identify which specific sensor has failed. 🎬 See this walkthrough for locating and replacing V6 sensors. The codes P0340/P0341 point to Bank 1, while P0345/P0346 point to Bank 2. It is often recommended to replace all sensors on the failed bank, or even all four, especially on higher-mileage vehicles.
Cost of Replacing a Camshaft Position Sensor
| Part/Service | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $50 - $100 per sensor |
| New Aftermarket | $22.76 - $74.90 per sensor |
| Shop Labor | $100 - $200 |
Frequently Asked Questions
How many camshaft sensors does my 2003-2013 CTS have?
It depends on the engine. The 3.2L and early 3.6L V6 engines typically have four sensors—an intake and exhaust sensor for each bank. V8 models (CTS-V) will also have multiple sensors. Always verify the exact number for your specific year and engine before ordering parts.
Can I replace just one sensor?
Yes, you can replace only the failed sensor. However, since the sensors are all the same age and have been exposed to the same conditions, it's common for another to fail soon after. Many mechanics recommend replacing them in pairs (both on the same bank) or all at once as preventative maintenance, especially if the labor is intensive.
Is this the same as a crankshaft position sensor?
No. The camshaft position sensor tracks the top part of the engine (camshafts), while the crankshaft position sensor tracks the bottom part (crankshaft). Both sensors work together. A failure in one can sometimes cause codes or symptoms related to the other.
Are there any recalls for the camshaft position sensor?
Searches of NHTSA data did not reveal any specific recalls for the camshaft position sensor itself. However, GM issued Technical Service Bulletins (TSBs), like PI0090E, for issues like intermittent hesitation related to poor connections at the camshaft sensor harness on 2004-2012 CTS models. This suggests that sometimes the problem is the wiring, not the sensor itself.
🎬 Watch: Is it the sensor or a timing chain issue?Helpful Videos
Technical Specifications
OEM Part Numbers: 12590907 12608424 213-3826 213-4689
The sensor is a 3-pin Hall Effect sensor that generates a digital ON/OFF pulse as the camshaft's reluctor wheel rotates past it. The V6 engines use four identical, interchangeable sensors.
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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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