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ABS Sensor Replacement
 
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Pelican Technical Article:

ABS Sensor Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$50 to $100

Talent:

***

Tools:

T25 driver and extension, penetrant spray, pliers, screwdriver

Applicable Models:

Volvo C30 T5 (2008-13)
Volvo C30 T5 R-Design (2008-13)

Parts Required:

ABS Sensors

Hot Tip:

Let the brakes cool before starting

Performance Gain:

No more ABS fault codes

Complementary Modification:

Replace brakes

The ABS wheel speed sensor on the Volvo C30 monitors road wheel movement and sends an electronic signal to the ABS module. This signal is used to calculate road wheel speed to help with ABS braking and stability control features. When an ABS wheel speed sensor fails, the ABS module loses road wheel speed for the corresponding wheel and sets a fault code for ABS wheel speed signal. When a fault code is set, the ABS warning light will illuminate. You will have to scan the module with a diagnostic scanner or code reader and read the fault codes to determine which speed sensor is the problem. Keep in mind, other problems can illuminate the ABS warning light, be sure to scan and read fault codes before you start replacing expensive parts.

Sometimes, you get lucky and the sensor only needs to be cleaned as brake dust and dirt can sometimes affect the operation of the sensor. If you get a fault code and it points out a failure with a sensor, you may want to remove and clean it before buying a new one. If the fault code re-appears, you may have to replace it.

Begin by jacking up and supporting the front of the car on jackstands, after putting on those stylish safety glasses. For more info please see our article on Jacking up your C30. Remove the front wheels and look directly behind the rotor at the top. You will see a wire harness leading into the back of the wheel hub. You'll see a T25 Torx bolt holding the sensor into the hub. Remove the screw.

Usually, removing the sensor from the hub can either be a simple matter of pulling it up and out of the hub. More often, the sensor will be stuck and will require some force to remove it. If the sensor is stuck, spray a good penetrant spray around the base and let it soak in for a few hours. Use a pair of pliers and gently walk the sensor back and forth to break it free. If it is still stuck, you can remove the brake rotor and gain better access to pry the sensor out with an appropriately sized screwdriver. Please see our articles on Rear Brake Pad Replacement and Rear Rotor Replacement for more information.

Once the sensor is removed, press the tab on the electrical connector and pull it off. Now clean the inside of the housing with brake cleaner. If there is any corrosion inside the bore, clean it off using a wire brush. You'll want to install the new sensors with a thin coating of anti-seize compound to the ABS sensor and the inside of the housing. It's also a good idea to put a drop of blue Loctite on the Allen bolts before re-installing them. All that's left is to plug the electrical connectors back in and you're done.

Both front wheels - Shown here is the electrical harness (green arrow) leading to the ABS sensor mounted in the wheel hub.
Figure 1

Both front wheels - Shown here is the electrical harness (green arrow) leading to the ABS sensor mounted in the wheel hub.

Both front wheels: Locate the T25 Torx screw holding the ABS sensor in place (green arrow).
Figure 2

Both front wheels: Locate the T25 Torx screw holding the ABS sensor in place (green arrow).

Both front wheels - Remove the T25 Torx screw using a long 1/4
Figure 3

Both front wheels - Remove the T25 Torx screw using a long 1/4" extension.

Both front wheels: Shown here is the ABS sensor with the brake rotor removed.
Figure 4

Both front wheels: Shown here is the ABS sensor with the brake rotor removed. If you are having trouble removing the sensor, remove the brake rotor and try gently playing the sensor out at the bottom edge (green arrow).

Both front wheels: Here is the ABS sensor removed.
Figure 5

Both front wheels: Here is the ABS sensor removed. You can see the rust buildup on the sensor.

Both front wheels: Press the tab on the electrical connector and pull it off the ABS sensor (arrow).
Figure 6

Both front wheels: Press the tab on the electrical connector and pull it off the ABS sensor (arrow).

Both front wheels: Shown here is an example of corrosion buildup inside the mounting hole.
Figure 7

Both front wheels: Shown here is an example of corrosion buildup inside the mounting hole. Take the time to clean this up using a small wire brush. Once clean, apply a thin coat of anti-seize compound to the inside of the hole and also the new sensor. This will help prevent the area from suffering any further corrosion.

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Comments and Suggestions:
DiegoM Comments: Thank you very much for its technical information , with the recommendations contained in his article, I cleaned the ABS sensors my Volvo C30 and I fixed the problem. The error code and the ABS warning light disappeared after driving for a few meters . Thank you so much guys.
February 29, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 

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