Cadillac ATS (2013-2019) Engine Camshaft Position Sensor Guide
Experiencing hard starts or a check engine light in your ATS? Your camshaft position sensor might be the culprit.
- Always inspect wiring connectors for corrosion or oil before replacing the sensor itself.
- Your ATS has multiple sensors; replacement difficulty and cost vary greatly depending on which one has failed.
- For hard-to-reach sensors, spend the extra money on an OEM (ACDelco) or premium aftermarket (Delphi) brand to avoid repeat labor.
- Symptoms like rough idle can also be caused by a related part, the camshaft actuator solenoid, which has a special warranty on some 2014 2.0L models.
Is Your Cadillac ATS Camshaft Position Sensor Failing?
A bad camshaft position sensor can cause noticeable engine problems. Because the sensor's signal is so important for engine timing, a failure can disrupt performance and even leave you stranded. Look out for these common signs.
- Check Engine Light: This is often the first warning. You may see codes like P0340, P0341, P0365, or P0366.
- Difficulty Starting: The engine may crank for a long time before it finally starts, or it may not start at all.
- Engine Stalling: The engine might suddenly shut off while driving or when stopped at an idle.
- Rough Idle and Misfires: Your car may shake or vibrate when stopped due to incorrect engine timing.
- Poor Acceleration: A failing sensor can cause a noticeable loss of power and sluggish performance.
- Worse Gas Mileage: When the engine's timing is off, it burns fuel less efficiently.
First, Check the Wiring
Before you replace the sensor, it's critical to inspect the wiring. On many Cadillac ATS models, the problem isn't the sensor itself but corrosion or oil contamination in the electrical connector at the sensor or even at the main engine computer (ECU). A new sensor will not fix a bad wire or dirty connector. Always check for clean, tight connections first.
Choosing the Right Aftermarket Sensor for Your ATS
When shopping for a new camshaft position sensor, you'll find several brands. Quality matters, especially for a part that can be difficult to replace. Here’s a breakdown of your options:
- Tier 1: OEM / Premium Aftermarket. Brands like ACDelco (the original GM part) and Delphi (a frequent GM supplier) are your safest bets. They are designed to meet the exact specifications of your ATS.
- Tier 2: Quality Aftermarket. Reputable brands like Standard Ignition (SMP), NGK, Hitachi, and Walker Products offer a good balance of quality and price. They are generally reliable and a solid choice for most repairs.
- Tier 3: Economy Brands. Cheaper, lesser-known brands may be tempting, but they have a higher risk of failing early or not working correctly out of the box.
Pro Tip: Pay for Quality on Hard-to-Reach Sensors
Your ATS has at least two camshaft sensors. Some are easy to get to, while others are very difficult. For example, the intake sensor on the 2.0L and 2.5L engines is at the back of the engine and requires significant labor to replace. For these hard-to-reach locations, it is strongly recommended to use a Tier 1 (ACDelco, Delphi) or Tier 2 brand to avoid having to do the job all over again.
Cadillac ATS Camshaft Position Sensor Cost
| Part Type | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $30 - $85 |
| New Aftermarket | $18 - $83 |
| Shop Labor | $125 - $375+ |
Cost estimates are for a single sensor and do not include taxes or fees. Labor costs vary widely based on which sensor needs replacement.
Frequently Asked Questions
How many camshaft position sensors does my Cadillac ATS have?
It depends on your engine. The 2.0L Turbo and 2.5L 4-cylinder engines have at least two sensors (one for the intake camshaft and one for the exhaust camshaft). The 3.6L V6 engine has four sensors—an intake and exhaust sensor for each of the two cylinder banks.
Where are the camshaft position sensors located?
Locations vary by engine. On the 2.0L/2.5L engines, the exhaust sensor is often accessible on the top or side of the engine, while the intake sensor is located on the back of the cylinder head near the firewall and is much harder to reach. On the 3.6L V6, two sensors are on the passenger side (Bank 1) behind the engine computer, and two are on the driver's side (Bank 2) near the power steering fluid reservoir.
Are there any recalls for the camshaft position sensor on the ATS?
No, there are no specific recalls for the camshaft position sensor itself. However, GM did issue a "Special Coverage" (N182189940) for the exhaust camshaft position actuator solenoid valve on some 2014 ATS models with the 2.0L Turbo engine, which can cause similar symptoms. It's important to diagnose the issue correctly to see which part has failed.
Can I replace the sensor myself?
For sensors that are easily accessible, a DIY replacement is very possible with basic tools (usually just a 10mm socket). However, for sensors in difficult locations (like the intake sensor on 4-cylinder models), the job is much more complex and may require removing other parts like the high-pressure fuel pump. If you are not an experienced mechanic, this is best left to a professional.
Technical Specifications
OEM Part Numbers: 12638266 12684186 12646782 12615371
The number and specific part number of the sensor depends on the engine (2.0L, 2.5L, or 3.6L) and which camshaft it monitors (intake or exhaust). Always verify the correct part for your specific vehicle configuration.
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.
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