A Guide to the Ignition Knock Sensor for the 2016-2024 GMC Yukon
Experiencing poor acceleration or hearing a pinging noise from your engine? Your knock sensor could be the problem.
- A bad knock sensor will trigger a Check Engine Light with codes like P0327 or P0332 and cause poor performance.
- For the 2016-2024 Yukon, the sensors are on the side of the engine block, making replacement easier than in older models.
- Always inspect the wiring harness for damage before replacing the sensor, as a bad wire can mimic a bad sensor.
- Using a quality aftermarket brand like Delphi can be a reliable, cost-effective alternative to a more expensive OEM part.
Symptoms of a Failing Knock Sensor in a GMC Yukon
A bad knock sensor can cause several noticeable problems with your Yukon. Because the engine's computer can't properly adjust ignition timing, you might experience a range of issues from minor annoyances to serious performance problems. The most common sign is the Check Engine Light illuminating on your dashboard. You may also notice reduced engine power, hesitation during acceleration, and worse fuel economy. In some cases, you might hear an audible pinging or knocking sound coming from the engine, especially under load.
Known Issues and Technical Service Bulletins (TSBs)
For 2015-2020 GMC Yukon models, GM issued a Technical Service Bulletin (TSB), PIP5576/18-NA-292, related to Diagnostic Trouble Code (DTC) P0333 (Knock Sensor Circuit High Voltage Bank 2). This code could appear when shifting out of Park. The cause was identified as potential voltage bleeding from the transmission park/neutral signal circuit into the knock sensor circuit. The fix involves inspecting the ECM's X2 electrical connector for debris or damage. While older TSBs for previous generations mentioned issues with water intrusion causing corrosion, this is less documented for the 2016+ models which have sensors located on the side of the engine block. Always check the wiring harness for damage or corrosion before replacing the sensor itself, as this can cause similar symptoms.
🎬 Learn more about TSBs and troubleshooting knock sensor circuits.Choosing the Right Aftermarket Knock Sensor
When replacing the knock sensor on your Yukon, you have a choice between OEM (Original Equipment Manufacturer) and aftermarket parts. For this specific component, quality is crucial for proper engine function.
- Delphi: Delphi is often a supplier of original equipment parts to GM. Choosing a Delphi sensor is often the closest you can get to OEM quality in the aftermarket. While reviews are mostly positive, some users have reported receiving defective parts out of the box, highlighting the importance of buying from a reputable source.
- Standard Ignition (SMP): Standard is a well-known aftermarket brand. Some forum users have had success with Standard sensors after OEM or other aftermarket parts failed. However, like any aftermarket part, quality can be inconsistent, and some users recommend sticking with the dealer part to avoid issues.
- Walker Products: Walker Products positions itself as an OE-quality replacement that is engineered to meet or exceed original specifications. They emphasize durable construction to resist heat and vibration. 🎬 See how Walker Products engineers their replacement knock sensors. User reviews are generally positive, though some have reported receiving different branded parts in a Walker box, so purchasing from a trusted retailer is key.
- Holstein: Holstein states that they source parts from factories that also supply OEMs and claim a part failure rate of less than 1%. They aim to provide an affordable alternative to more expensive brands while maintaining quality standards.
Pro Tip: The knock sensors on 2016-2024 GMC Yukons are located on the sides of the engine block, one per bank (Bank 1 is the driver's side, Bank 2 is the passenger's side). They are easier to access than on previous generations, where the intake manifold had to be removed. However, the space can still be tight, especially for the passenger side sensor.
Cost of Replacing a GMC Yukon Knock Sensor
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part | $83 - $111 |
| New Aftermarket Part | $27.82 - $34.28 |
| Shop Labor | $61 - $222 |
| Total Professional Replacement | $149 - $332 |
Frequently Asked Questions (FAQ)
Where are the knock sensors located on a 2016-2024 GMC Yukon?
For this generation, the two knock sensors are located on the exterior of the engine block, below the exhaust manifolds. 🎬 Watch this video to see the exact sensor locations. Bank 1 (Sensor 1) is on the driver's side, and Bank 2 (Sensor 2) is on the passenger's side. This makes them more accessible than on older models that had the sensors under the intake manifold.
Can I replace a knock sensor myself?
Yes, for a DIYer with moderate experience, this is a feasible job. The sensors are bolted to the side of the block, often accessible through the wheel well. You will need tools like a long extension and a socket (typically 12mm or 13mm). The main challenge is the tight workspace. It is critical to torque the new sensor to the correct specification (often around 15 ft-lbs) as over- or under-tightening can cause it to malfunction.
What happens if I don't replace a bad knock sensor?
If you continue driving with a faulty knock sensor, the engine's computer may not be able to detect and prevent harmful engine knock. This can lead to reduced power, poor fuel economy, and in the long term, potentially severe engine damage. The computer will likely default to a "safe" mode with retarded ignition timing, which causes the poor performance.
Is an aftermarket knock sensor as good as an OEM one for my Yukon?
It depends on the brand. Brands like Delphi are often the original equipment supplier for GM, so their aftermarket parts are considered very reliable. Other quality aftermarket brands can also be a good value. However, knock sensors are sensitive electronic parts, and some owners report issues with cheaper, unbranded options, sometimes having to do the job more than once. If you want the highest assurance of compatibility, OEM (ACDelco GM Original Equipment) is the safest choice, but a quality aftermarket brand can offer significant savings.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12623744
The GMC Yukon uses two knock sensors, one for each engine bank. They are piezoelectric sensors that generate an AC voltage signal based on engine vibrations. The correct torque specification during installation is critical for proper function.
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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.
- GMC Yukon: