Cadillac CTS Turbocharger Boost Sensor Guide for 2014-2019 Models
Restore lost power and clear that check engine light on your turbocharged CTS.
- This part is for turbocharged 2014-2019 Cadillac CTS models only (2.0T and 3.6L Twin-Turbo).
- Symptoms almost always include a check engine light and a major loss of power.
- Replacement is very easy and accessible, making it a great DIY repair to save on labor costs.
- High-quality aftermarket brands like Bosch and Hella offer the same performance as OEM for a lower price.
Is Your Turbocharged CTS Feeling Sluggish?
If your 2014-2019 Cadillac CTS with the 2.0T or 3.6L Twin-Turbo engine feels down on power or has a check engine light on, a faulty turbocharger boost sensor could be the culprit. This small sensor plays a big role in how your engine performs. When it fails, it can cause a range of noticeable problems, but it's fortunately a straightforward and affordable part to replace.
This guide covers the symptoms of failure, how to choose the right aftermarket replacement, and what to expect for replacement costs.
Symptoms of a Failing Boost Sensor
A bad boost sensor sends incorrect pressure readings to the engine's computer, leading to poor performance. You will likely experience one or more of the following issues:
🎬 Watch: Top 8 symptoms of a bad boost pressure sensor- Check Engine Light: This is the most common sign. The system will log fault codes like P0236, P0237, or P0238. 🎬 See common causes and fixes for the P0236 trouble code
- Significant Loss of Power: The car will feel slow and sluggish because the computer reduces or cuts turbo boost to protect the engine.
- Poor Fuel Economy: The engine computer can't calculate the right air-fuel mixture, often running too rich and wasting fuel.
- Engine Hesitation or Surging: Acceleration may be jerky or inconsistent as the computer struggles with bad data from the sensor.
- Rough Idle: The engine may idle poorly or unstably because the air-fuel mixture is incorrect even at a standstill.
A Note on Model Years
This guide applies specifically to the third-generation Cadillac CTS, model years 2014, 2015, 2016, 2017, 2018, and 2019, which were offered with turbocharged engines (2.0L Turbo and 3.6L Twin-Turbo V-Sport). Earlier 2009-2013 models used different engines that do not use this specific part.
Choosing the Right Aftermarket Boost Sensor
When replacing the boost sensor, you don't have to go back to the dealer. High-quality aftermarket brands offer excellent reliability, often at a better price.
- OEM (ACDelco): This is the original part that came on your Cadillac. It's a reliable choice, but typically the most expensive option when purchased from a dealer.
- Premium Aftermarket (Bosch, Hella): Brands like Bosch and Hella are global leaders that manufacture parts for many car companies. Bosch is often the original equipment manufacturer for sensors on many vehicles. Choosing one of these brands gives you OEM-level quality and fit without the dealer markup. They are excellent, reliable replacements.
Pro Tip: Location and Installation
On the popular 2.0L Turbo engine, the boost sensor is located on the charge pipe right at the front of the engine, near the throttle body. It is held in by a single bolt and has one electrical connector. Replacement is very simple: unplug the connector, remove the bolt, swap the sensor, and reinstall. This is a great DIY task for any skill level and requires only basic tools.
🎬 Watch this quick walkthrough of the boost pressure sensor replacementCost to Replace a Cadillac CTS Boost Sensor
| Part Type | Part Cost | Estimated Labor Cost |
|---|---|---|
| New OEM (ACDelco) | $60 - $110 | $60 - $120 |
| New Aftermarket (Bosch, Hella) | $39 - $84 |
Cost estimates are approximate and can vary based on your location and the specific repair shop's labor rates. The job is simple enough that many shops will charge their minimum fee, typically 0.5 to 1.0 hour of labor.
Frequently Asked Questions
Where is the boost sensor located on my CTS?
For the 2.0L Turbo engine, the sensor is mounted on the intake charge pipe between the intercooler and the throttle body, easily visible at the top-front of the engine. For the 3.6L Twin-Turbo V-Sport, there are multiple pressure sensors, but the primary ones are in similar, accessible locations on the intake piping.
Can I just clean my old boost sensor?
While some sensors can get dirty with oil or carbon, cleaning is often a temporary fix or may not work at all if the internal electronics have failed. Given the low cost of a new, reliable aftermarket sensor, replacement is the recommended and most durable solution.
Are there any recalls for the turbo boost sensor on the CTS?
No. While the 2014-2019 CTS has had recalls for other issues like power steering and axle components, there are no active recalls or widespread Technical Service Bulletins (TSBs) from GM for a faulty turbocharger boost sensor.
Is a boost sensor the same as a MAP sensor?
Yes, essentially. A boost sensor is a type of Manifold Absolute Pressure (MAP) sensor specifically designed to read the positive pressure (boost) created by a turbocharger or supercharger, in addition to the vacuum present in a naturally aspirated engine.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12644228
Measures absolute pressure in the intake manifold to provide boost data to the ECM. Typically a 3-pin sensor operating on a 5V reference signal.
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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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