Replace the front wheel speed sensor on a 2023 Chevrolet Bolt EUV to restore ABS and traction control functionality.

Warnings

Tools required

Parts

• Front ABS wheel speed sensor × 1 — Use OEM GM part number for 2023 Bolt EUV
• ABS sensor bolt (if corroded) × 1 — M6 x 25mm shoulder bolt

Preparation

1. Place wheel chocks behind the rear wheels
2. Loosen the front wheel lug nuts while the vehicle is on the ground
3. Raise the front of the vehicle using a floor jack at the designated front jacking point
4. Support the vehicle with jack stands under the chassis rails
5. Remove the front wheel on the side requiring sensor replacement
6. Clear any diagnostic trouble codes from the vehicle's computer to verify repair after completion

Procedure

1. 1

   Locate the ABS wheel speed sensor
   The front ABS wheel speed sensor is mounted on the rear side of the steering knuckle, near the top of the wheel bearing hub. Identify the sensor body and the electrical connector with its wiring harness routing clips.
2. 2

   Disconnect the sensor electrical connector
   Follow the sensor wire harness upward toward the wheelwell. Locate the electrical connector (typically secured with a lock tab). Press the release tab and carefully pull the connector apart. Do not pull on the wires themselves.
3. 3

   Remove harness routing clips
   The sensor harness is secured to the knuckle and suspension components with plastic routing clips. Using a flat blade screwdriver or trim tool, carefully release each clip working from the sensor toward the connector. Note the routing path for reinstallation.
4. 4

   Remove the ABS sensor mounting bolt
   Using an 8mm socket or wrench, remove the single bolt securing the sensor to the steering knuckle. The bolt passes through a mounting ear on the sensor body. If the bolt is corroded or seized, apply penetrating oil and allow it to soak before removal.
   Torque spec

   ABS Sensor Bolt10 Nm (7 lb-ft)
5. 5

   Extract the sensor from the knuckle
   Carefully pull the sensor body straight out from the bore in the steering knuckle. If the sensor is stuck due to corrosion or debris, gently twist while pulling. Do not use excessive force or pry tools that could damage the knuckle bore.
6. 6

   Clean the sensor bore and mounting surface
   Use a wire brush to clean any corrosion, rust, or debris from the sensor bore in the knuckle and the mounting surface around the bolt hole. Spray electrical contact cleaner into the bore and wipe clean. Inspect the bore for damage; it should be smooth and free of deep scoring.
7. 7

   Prepare the new sensor
   Remove the new sensor from its packaging. Apply a thin coat of dielectric grease to the O-ring or sealing surface on the sensor body (if equipped). Do not apply grease to the sensor tip itself. Inspect the sensor connector pins for damage.
8. 8

   Install the new sensor
   Insert the new sensor into the bore in the steering knuckle, ensuring it is fully seated. The sensor should slide in smoothly without forcing. Align the mounting ear with the bolt hole in the knuckle.
9. 9

   Install and torque the sensor mounting bolt
   Thread the sensor mounting bolt by hand to ensure proper alignment. Using a torque wrench and 8mm socket, tighten the bolt to exactly 10 Nm (7 lb-ft). This is a critical torque specification; over-tightening can crack the sensor housing or strip the knuckle threads.
   ⚠The ABS sensor mounting bolt requires precise torque of 10 Nm. Do not exceed this value.
   Torque spec

   ABS Sensor Bolt10 Nm (7 lb-ft)
10. 10

    Route and secure the harness
    Route the sensor harness along the same path as the original, ensuring it does not contact moving suspension components, the CV axle, or brake components. Secure the harness with the routing clips, pressing each firmly into place until it clicks.
11. 11

    Reconnect the electrical connector
    Align the sensor connector halves and push together until the locking tab engages with an audible click. Gently tug on the connector to verify it is fully locked. Ensure no dirt or moisture is present in the connector.
12. 12

    Reinstall the wheel
    Mount the wheel onto the hub, threading all lug nuts by hand to prevent cross-threading. Using a torque wrench, tighten the lug nuts to 136 Nm (100 lb-ft) in a star pattern to ensure even seating.
    Torque spec

    Wheel Lug Nuts136 Nm (100 lb-ft)

Reassembly

1. Lower the vehicle from the jack stands and remove the jack
2. Perform a final torque check on the wheel lug nuts with the vehicle on the ground
3. Remove wheel chocks

Verification

• Start the vehicle and verify the ABS warning light illuminates briefly during self-test, then extinguishes
• Use a diagnostic scan tool to verify the new sensor is communicating and reading wheel speed (should show 0 km/h when stationary)
• Perform a test drive at low speed (under 25 km/h) in a safe area and verify the ABS light does not illuminate
• Drive the vehicle above 15 km/h to allow the system to complete its self-calibration
• Re-scan for any remaining ABS or traction control codes; none should be present related to the replaced sensor

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