C0040 on Lincoln
Right Front Wheel Speed Sensor Circuit
C0040 on Lincoln vehicles indicates right front wheel speed sensor circuit. Au7o has documented this code across 1 Lincoln model — most commonly on Aviator. This is a brake/ABS-system code. The right front wheel speed sensor measures how fast that wheel is rotating and feeds that data to the anti-lock brake, traction control, and stability control systems. C0040 means the ABS module found an electrical problem in the right front wheel speed sensor circuit — for example an open circuit, a short, or a signal that is missing or out of range. You'll normally see the ABS and traction/stability lights come on, and those systems may shut off temporarily while your regular brakes keep working.
Common Causes of C0040
- •Failed right front wheel speed sensor
- •Damaged, corroded or unplugged sensor wiring/connector
- •Damaged or rust-clogged tone/reluctor ring
- •Excessive air gap between sensor and tone ring
- •Wheel bearing wear affecting an integrated sensor
- •Water intrusion or corrosion at the connector
- •Faulty ABS control module (less common)
C0040 on Lincoln by Model
Lincoln Aviator(1 issue)
- Front Wheel-End Hum or Grind - Bearing Diagnosis Before Hub Selection2020-2022
A speed-related hum, growl, grind, vibration, or wheel-end play can be consistent with a wheel bearing, but tire tread, wheel damage, brakes, axle or CV joints, driveline components, and other rotating parts can sound similar. The reviewed evidence does not establish a Lincoln Aviator-wide premature front-hub defect or a reliable failure mileage. A bearing diagnosis must identify the corner and drivetrain configuration before any hub is selected.
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View C0040 across all makes →Frequently Asked Questions
What does C0040 mean on Lincoln?▼
C0040 stands for "Right Front Wheel Speed Sensor Circuit." This is a brake/ABS-system code. The right front wheel speed sensor measures how fast that wheel is rotating and feeds that data to the anti-lock brake, traction control, and stability control systems. C0040 means the ABS module found an electrical problem in the right front wheel speed sensor circuit — for example an open circuit, a short, or a signal that is missing or out of range. You'll normally see the ABS and traction/stability lights come on, and those systems may shut off temporarily while your regular brakes keep working. On Lincoln specifically, this code is documented across 1 model.
What causes C0040 on Lincoln vehicles?▼
Common causes on Lincoln: Failed right front wheel speed sensor, Damaged, corroded or unplugged sensor wiring/connector, Damaged or rust-clogged tone/reluctor ring, Excessive air gap between sensor and tone ring, Wheel bearing wear affecting an integrated sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0040 on a Lincoln?▼
Repair costs vary widely depending on the root cause and specific Lincoln model.
Which Lincoln models have C0040 documented?▼
Au7o has documented C0040 on 1 Lincoln model: Aviator.