A Guide to Replacing the Ignition Knock Sensor on Your 2014-2017 Chevrolet SS
Keep your SS's LS3 V8 engine safe from harmful engine knock with the right replacement sensor.
- The knock sensors on the 2014-17 SS are on the sides of the LS3 block, not under the intake, making replacement easier.
- Common failure codes are P0327 and P0332.
- High-quality aftermarket brands like Delphi and NGK/NTK are considered reliable alternatives to OEM parts.
- No specific recalls or TSBs exist for this part on the Chevrolet SS.
Is Your Chevy SS Knock Sensor Failing?
A bad knock sensor can't do its job of protecting your engine. The car's computer may switch to a "safe mode," which reduces engine power and performance to prevent damage. You'll notice your powerful SS suddenly feels sluggish.
Symptoms of a Bad Knock Sensor
- Check Engine Light: This is the most common sign. You will likely see error codes P0327 or P0332. 🎬 Watch: How to diagnose these specific GM knock sensor codes
- Reduced Engine Power: The car's computer will retard timing to protect the engine, making the car feel slow.
- Poor Fuel Economy: With the engine not running efficiently, you may notice you're using more gas.
- Engine Pinging Noise: In some cases, you might hear a metallic pinging or knocking sound, especially during acceleration.
A Note on Location
Unlike older GM V8s, the knock sensors on the 2014-2017 Chevrolet SS are NOT located under the intake manifold. Your LS3 engine has two sensors bolted to the lower sides of the engine block. This makes them much easier to replace, as the job can be done from underneath the car without major engine disassembly.
🎬 See this walkthrough for replacing an LS3 knock sensorChoosing the Right Aftermarket Knock Sensor
Because the labor to replace these sensors is not as difficult as on other cars, you have more flexibility in your choice. However, using a quality part is always recommended to ensure it works correctly and lasts a long time.
Brand Quality Tiers
- Tier 1 (OEM & OE Equivalent): Brands like Delphi and NGK/NTK are often original equipment suppliers to major automakers, including GM. They are trusted for their quality and reliability and are considered a safe bet for your SS. ACDelco is the original GM part, but some users in forums have reported recent quality control issues with certain sensors.
- Tier 2 (Trusted Aftermarket): Brands like Standard Ignition and Walker Products have been in the aftermarket for a long time. They generally offer good quality and are a solid choice if Tier 1 brands aren't available.
- Tier 3 (Budget-Friendly): Brands like Global Parts, True Tech, and Holstein often provide the lowest price. While tempting, their long-term reliability can be less consistent. They may be a good option for a quick fix, but consider the possibility of having to do the job again sooner than you would with a premium brand.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Part | $15 - $30 |
| New OEM Part (ACDelco) | $60 - $90 |
| Shop Labor | $120 - $225 |
Pro Tip: Replace in Pairs?
Your SS has two knock sensors. If one fails, the other may not be far behind, especially if the failure is due to age or corrosion. Since you'll already be working under the car, it's good practice to replace both sensors and their wiring pigtails at the same time. This saves you from having to do the same job twice.
Frequently Asked Questions
Where are the knock sensors on my Chevy SS?
The two knock sensors are located on the lower external sides of the engine block, not under the intake manifold like on older LS engines. You will need to lift the vehicle to access them from underneath. One is typically near the starter motor.
What happens if I ignore a bad knock sensor?
Your car will likely run with reduced power as the computer enters a safe mode to prevent engine damage. Driving for an extended period this way can lead to poor fuel economy and, in a worst-case scenario, could leave the engine vulnerable to damage if a real knock event occurs and the sensor can't report it.
Are aftermarket knock sensors reliable for the SS?
Yes, high-quality aftermarket sensors from reputable brands like Delphi or NGK/NTK are very reliable and are often made by the same companies that supply the original parts to GM. While budget parts can work, their performance and lifespan may not be as consistent.
Are there any recalls for the knock sensor on the 2014-2017 Chevrolet SS?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database and other sources did not find any specific recalls or Technical Service Bulletins (TSBs) for ignition knock sensors on the 2014-2017 Chevrolet SS.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12623730
Two sensors required, one for each engine bank. Located on the external sides of the engine block.
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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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