ABS Warning Light On, Traction Off Warning Light On, DTCs C1223 and C1225 Set (Replace Left Front ABS Wheel Speed Sensor Jumper Harness)

Some customers may comment that the ABS warning light and/or Traction Off warning light is illuminated. Upon investigation, the technician may find ABS codes (C1223 - C1225) set as intermittent or hard failures.

The cause of this condition may be the front wheel speed sensor jumper harness. The harness may check good with the voltmeter, but will not function correctly when subjected to suspension movement, vibration, and flexing.

Visually inspect the left front ABS wheel speed sensor harness connector. The wires may become unseated from the connector. This is especially important on the left side. If the wiring is faulty, replace the harness using the procedure listed below.

1. Raise and support the vehicle.
2. Unclip the 3 forward harness routing clips. These clips will be used on the new harness.
3. Remove the remaining 2 harness routing clips from the control arm. The new harness includes these 2 clips for locating purposes.
4. Disconnect the wheel speed sensor connector.
5. Route the new harness into position and install clips.
6. On the old harness, cut the tape, pull back the conduit, and cut the wire harness to length.
7. Strip the wire ends, splice the wires using the provided splice clips. Put back in conduit and tape.
8. Lower the vehicle.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use:

* This is a unique labor operation number for use only with this bulletin. This number will not be published in the Labor Time Guide.