Noise coming from the wheels, an illuminated malfunction indicator lamp, antilock brake-related symptoms, traction control issues, or transmission-related symptoms are all indicators of potential vehicle problems. But did you know, each of these vehicle warnings could occur with hub bearing or wheel speed sensor failure? It is always important when having your vehicle inspected for repair to eliminate all possible potential failures. The last thing you’d want to do is to repair a transmission when it’s only the hub or wheel bearings, replacing a defective wheel speed sensor. Seems unlikely, but we promise, it has happened.
So how does damaged occurring to the hub or wheel bearings? Some hub bearing assemblies contain internal wheel speed sensors while others use external sensors. Some of the problems that can arise and cause damage to the sensors include:
If there is debris, the last thing you want to do is use a magnetic tool to remove it. This can damage the encoder ring. Rather, remove the debris with a soft bristle brush or use a mild detergent to wash the decoder ring. Sometimes removing the hub bearing is necessary to ensure a thorough cleaning, but your trusted auto shop and technician can take care of this easily.
While wheel bearings are designed to last for many miles, the fact is they can still fail for various reasons due to normal wear and tear on your vehicle. When diagnosing symptoms that may indicate trouble with the hub bearing or wheel speed sensor, the technician should focus first on the possibility that it’s a defective wheel speed sensor, wiring, or contamination affecting the sensor signal before other options are considered. That means make sure you take your vehicle in for thorough diagnostics, and making sure line graph diagnostics are performed on each wheel speed sensor and compared to other sensor signals. To read more about hub bearing inspections click.
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Strange nioses from car. Missing a few pulses.Corridinating, all speed sensors, (8)TCM,and ECU up, 2004 Saturn 3.0 clearing a few glitches, August 14,2021.
2006 Honda Pilot has loss of communication past 30 mph with abs modules. Honda recommends changing the module but I believe that the wheel bearings in the front of the vehicle are both bad and I’m thinking that that may be most of the problem there? 🤷
Thank you for the suggestion!
Is it normal to have oil on the enteral part of the speed sensor
Thank you for the question, Mike! If you’re referring to a Vehicle Speed Sensor (VSS), it is common for gear oil to be present as the sensor is located in the gearbox. Symptoms of a malfunctioning VSS may include erratic (rough) shifting of gears, speedometer inaccuracies, or a check engine light. If any of these symptoms exist, it would be recommended to have the vehicle inspected by a specialist.
2018 Sonata Limited left wheel speed sensor went bad. I replaced the entire assembly by myself. One nut needed special wrench to get at other than standard wrench. Now the right front went bad. I am thinking that something inside of the assembly that got exposure to the elements is the issue. I will take both apart and see if I can find a problem that can be cleaned. Hyundai must correct these sensors going bad with their vehicles under 40,000 miles like mine and driven in good climate conditions.
Thank you for sharing, Alexander!
98 gmc k1500 with 4 inch lift. going slow applying the breaks a terrible grinding and hard to stop. This only happens sometimes n the abs light will come on then it goes off. What should I look for a bearing or a sensor?
So, I have a 2015 Malibu, getting reading that the front right wheel speed sensor is weak/erratic signal, and that’s the only code. I just replaced it, and same code came up after clearing them.
1) should I do the speed sensor again? Perhaps it’s a faulty one
2) should I replace the bearing?
Only thing I notice is excessive grinding when breaking, but coming from the left rear wheel.
I did make sure the wheels were all accurate on location. Would the left rear braking grinding be coming from the front right sensor, or should I focus on changing it the left rear. Troubleshooting device says front right speed sensor but symptoms of grinding brakes are only in the left rear
Thank you for reaching out!
A thorough inspection of the vehicle may help to pinpoint the cause of the erratic speed sensor signal. Investigate the noise to determine the possible cause and safety concern. Erratic readings impacting the ABS system may have multiple causes, not just a faulty speed sensor. Using an ohmmeter, you could test each sensor to determine if they are meeting the manufacturer’s specifications. These spec’s can be found in a repair manual for this vehicle.
There are other factors that could affect speed sensor output. Damaged wiring or corroded electrical connections are two common causes. Excessive lateral end play of a wheel bearing is another possibility. Excess bearing play could impact the tolerance of the sensor to the exciter ring as an example. The inspection would also help to determine if corrosion or any debris (metallic particles) have collected on the magnetic encoder.