C0045 on Cadillac

Left rear wheel speed sensor circuit fault (GM)

Severity: Severity not verified — if the car runs badly, have it inspected

The sources describe the fault and lamps but not drivability; ABS and stability systems are safety-critical, so have it checked.

It gets more serious if:

Stop: The red brake warning lamp comes on, the pedal feels soft or low, or steering assist is lost along with the ABS lamp.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

This page covers only what differs on Cadillac. For what C0045 means, the ranked causes and the test order, see the C0045 guide.

What's different on Cadillac

Cadillac

2011 · SRX
Supported by vehicle data
A 2011 SRX complaint reports C0045 from a broken left rear sensor encoder ring at about 96,000 miles.

Sources and review

NHTSA complaints ODI 11219167 (Cadillac SRX) and 11165895 (Chevrolet Equinox) — NHTSA ODI
GM 08-05-25-002: ABS code C0045 and/or C0050 (inspect connector X408 or left/right rear wheel speed sensor harness) — General Motors via NHTSA

Last reviewed: October 16, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error