C0500 on Cadillac
Left Front Wheel Speed Sensor Circuit Open
C0500 on Cadillac vehicles indicates left front wheel speed sensor circuit open. Au7o has documented this code across 1 Cadillac model — most commonly on XT4. The Electronic Brake Control Module monitors the left front active wheel speed sensor circuit and sets C0500 when it detects an open in that circuit — no valid current-modulated signal returning from the sensor. GM groups it with C0501 (range/performance), C0502 (short to ground), C0503 (short to battery) and C0504 (erratic/intermittent) as the left-front set within the C0500-C0516 wheel speed sensor family. Losing a wheel speed input causes the EBCM to disable ABS, traction control and StabiliTrak, and because those wheel speeds are broadcast on the serial data bus, downstream systems that consume them (including AWD and driveline controllers) will also drop out and post their own messages. Typical repair costs on Cadillac range from $400 to $2,500, depending on the specific model and root cause.
Common Causes of C0500
- •Open or high-resistance in the left front wheel speed sensor signal or supply circuit — chafed harness at the strut/knuckle routing is the classic failure point
- •Failed left front wheel speed sensor
- •Corroded or water-intruded sensor connector
- •Damaged or contaminated magnetic encoder ring in the front hub/bearing assembly, or an excessive sensor-to-ring air gap
- •Loose or corroded EBCM connector terminals
C0500 on Cadillac by Model
Cadillac XT4(1 issue)
- "Service All Wheel Drive System" Message and Loss of AWD From Front Axle Disconnect Actuator2019-2022
AWD XT4s use a twin-clutch rear drive unit with a front-axle disconnect that decouples the driveshaft for fuel economy. When the disconnect actuator, its position sensor, or the rear drive unit clutch control fails, the driver information center posts "Service All Wheel Drive System" and the vehicle reverts to front-wheel drive. Owners report the message appearing at very low mileage - CarComplaints logs the 2020 average at roughly 2,000 miles - which points to a component or calibration defect rather than wear. The vehicle remains drivable in FWD, but traction in snow and rain is materially reduced and the fault is often intermittent, clearing on a restart and returning later.
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What does C0500 mean on Cadillac?▼
C0500 stands for "Left Front Wheel Speed Sensor Circuit Open." The Electronic Brake Control Module monitors the left front active wheel speed sensor circuit and sets C0500 when it detects an open in that circuit — no valid current-modulated signal returning from the sensor. GM groups it with C0501 (range/performance), C0502 (short to ground), C0503 (short to battery) and C0504 (erratic/intermittent) as the left-front set within the C0500-C0516 wheel speed sensor family. Losing a wheel speed input causes the EBCM to disable ABS, traction control and StabiliTrak, and because those wheel speeds are broadcast on the serial data bus, downstream systems that consume them (including AWD and driveline controllers) will also drop out and post their own messages. On Cadillac specifically, this code is documented across 1 model.
What causes C0500 on Cadillac vehicles?▼
Common causes on Cadillac: Open or high-resistance in the left front wheel speed sensor signal or supply circuit — chafed harness at the strut/knuckle routing is the classic failure point, Failed left front wheel speed sensor, Corroded or water-intruded sensor connector, Damaged or contaminated magnetic encoder ring in the front hub/bearing assembly, or an excessive sensor-to-ring air gap, Loose or corroded EBCM connector terminals. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0500 on a Cadillac?▼
Repair costs on Cadillac range from $400 to $2,500, depending on the specific model and root cause.
Which Cadillac models have C0500 documented?▼
Au7o has documented C0500 on 1 Cadillac model: XT4.