NHTSA ID Number: 10236688
Manufacturer Communication Number: SSM 51665
Summary
Some 2021-2023 Ford
and Lincoln vehicles equipped with a 2.7L or 3.0L engine may exhibit an upper engine thump/knock noise coming from the left cylinder head. This condition is most noticeable at idle and may lessen at higher engine speed or while driving. This condition does not affect vehicle durability and will not get worse over time. Use a stethoscope or chassis ears and listen just behind the left cylinder head intake VCT solenoid on the cam cover to determine if the thump/knock noise is coming from the cylinder head/camshaft. The left cylinder head and the camshaft roller followers are available as service parts.
25 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| FORD | BRONCO | 2021-2023 |
| FORD | EDGE | 2020-2023 |
| FORD | EXPLORER | 2020-2023 |
| FORD | F-150 | 2020-2023 |
| LINCOLN | AVIATOR | 2020-2023 |
| LINCOLN | MKX | 2020-2021 |
| LINCOLN | NAUTILUS | 2020-2023 |
1 Associated Document
Manufacturer Communications
SSM 51665
2021-2023 Bronco (U725N) (G1)
2020-2023 Edge (CD539N) (DQ)
2020-2023 Explorer (U625N) (TW)
2020 F-150 (P552) (FC)
2021-2023 F-150 (P702) (FD)
2020-2023 Aviator (U611N) (TV)
2020-2023 MKX/Nautilus (U540N) (D9)
2.7L/3.0L Engines – Upper Engine Thump/Knock Noise
Bestseller No. 1
Steelman Wireless ChassisEAR Auto Diagnostic Tool Kit, Identify The Cause of Troubling Vehicle Noises, 4 Transmitters with 50-Foot Range (61082)
- NOISE DETECTION - Detect the source or squeaks, rattles, and other errant or troublesome noises
- 50-FOOT RANGE - Transmitters have a 50-foot signal range allowing use on small and large vehicles
- BUILT-IN SPEAKER - Monitor sounds with the built-in speaker or via headphones through the 3.5mm jack
- SIGNAL STRENGTH INDICATOR - LED lights indicate signal strength of the active channel
- ILLUMINATED CHANNEL BUTTONS - Active channels have illuminated buttons and can be changed or muted with a quick push
Bestseller No. 2
STEELMAN PRO Wireless ChassisEAR 2 Auto Diagnostic Kit
- Quickly detect the source of squeaks, rattles, and other noises throughout a car or truck's chassis
- Kit includes four independent transmitters to mount throughout the vehicle
- 4.3-inch LCD touchscreen-equipped control unit with easy to use interface
- Transmitter jumpers allow separate mounting of clamps and transmitters in confined spaces
- Color coded boots and location naming in software to quickly locate trouble spots
Bestseller No. 3
ZKTOOL Chassis Ears Electronic Stethoscope Diagnostic Kit with Headphones, Electronic Ears Automotive,6 Channel Car Engine Noise Finder Sound Detector Tester Tool Set
- Auto Detector Tool with Seek Out the Noises:This automotive engine tools is specially designed and developed for checking abnormal noise of automobile engine, abnormal noise of body, and abnormal noise of chassis, etc.The host computer with integrated six-channel signal receiver is used with six different sensors to detect abnormal noise during the driving of the car, synchronized with sound and light, which can easily identify the early problems
- Multi-Channel Chassis Ears Automotive Engine Tool:6-channel detector design, sound and light synchronization. This auto detector tool can detect abnormal noise in different locations and adjust the reception of different channels according to the detection situation.When a generator is running, it can detect the impact of vibration due the failure of a bearing, gear, valve, crank, cylinder, gearbox, vehicle body noise, etc.
- Abnormal sound indicator lighe:The abnormal sound indicator consists of three colors: green, yellow, and red. The color changes are determined by the detected volume. The minimum volume is green and the maximum is red. The abnormal noise of the six channels can be shown at the same time through the six rows of indicator lights. By adjusting the light sensitivity knob, the indicator can be used to assist in judging the location of the anomalous noise.
- Chassis Ear Car Detector Tool with Indicator light sensitivity & headphone:The car engine noise detector tool turn the indicator light clockwise to increase the sensitivity, and the range of the indicator light changes with the adjustment of the sensitivity. 6 Channel chassis ear car detector tool have six channels to detect abnormal noise sources at different locations at the same time, freely select channels through channel selection.
- List: The package includes 1 * detector host, 6 * clip-on sensors (Abnormal noise information can be detected at six different locations at the same time), 1 * headphone (Simple and comfortable, the volume can be adjusted at will), 3 * 3M sensor extension cables, 3 * 5M sensor extension cables. If you encounter any problems during use, please feel free to contact us.
Bestseller No. 4
KTTOOL Chassis Ears Automotive Engine Noise Finder, 6 Channel Car Sound Detector Tester Tool Set, Electronic Stethoscope Diagnostic Kit with Headphones
- 🚕【PMulti-Channel Chassis Ears Automotive Engine Tool】: 6-channel detector design, sound and light synchronization. This auto detector tool can detect abnormal noise in different locations and adjust the reception of different channels according to the detection situation.When a generator is running, it can detect the impact of vibration due the failure of a bearing, gear, valve, crank, cylinder, gearbox, vehicle body noise, etc.
- 💡【Abnormal sound indicator lighe】: The abnormal sound indicator consists of three colors: green, yellow, and red. The color changes are determined by the detected volume. The minimum volume is green and the maximum is red. The abnormal noise of the six channels can be shown at the same time through the six rows of indicator lights. By adjusting the light sensitivity knob, the indicator can be used to assist in judging the location of the anomalous noise.
- 🔎【Chassis Ear Car Detector Tool with Indicator light sensitivity】: The car engine noise detector tool turn the indicator light clockwise to increase the sensitivity, and the range of the indicator light changes with the adjustment of the sensitivity. 6 Channel chassis ear car detector tool have six channels to detect abnormal noise sources at different locations at the same time, freely select channels through channel selection.
- ✅【List】: The package includes 1 * detector host, 6 * clip-on sensors (Abnormal noise information can be detected at six different locations at the same time), 1 * headphone (Simple and comfortable, the volume can be adjusted at will), 3 * 3M sensor extension cables, 3 * 5M sensor extension cables. If you encounter any problems during use, please feel free to contact us.
- ❗【Note】: Due to transportation restrictions, this product does not include batteries. You will need to provide your own AAA batteries
Bestseller No. 5
STEELMAN 06600 ChassisEAR Electronic Squeak and Rattle Finder
- PINPOINT TROUBLING NOISES - Easily pinpoint troubling noises that cannot be duplicated in a repair stall and only occur during road driving
- MULTI-CHANNEL - Connect up to six (6) microphones to different under-chassis locations simultaneously to find a noise's source
- FULL HEADPHONES - Includes a set of full-coverage headphones to block out surrounding noise
- COLOR CODED LEADS - Each microphone / clamp is color coded for easy identification
- 16-FOOT CABLES - 16-foot long wire leads allow microphones to be positioned in difficult to reach places
Last update on 2026-06-18 / Affiliate links / Images from Amazon Product Advertising API
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