C0040
Medium SeverityRight Front Wheel Speed Sensor Circuit
Chassis/Brakes System
C0040 — Instant Answer
Right Front Wheel Speed Sensor Circuit
Severity: MEDIUM SEVERITY
Meaning: ABS lost signal from the right front wheel speed sensor.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $20 - $60
Most common causes:
- 1. Failed sensor (35-45% of cases)
- 2. Damaged wiring (35-45% of cases)
- 3. Dirty sensor (10-25% of cases)
Symptoms
- ⚠️ABS light on
- ⚠️Traction control disabled
- ⚠️Stability control off
Common Causes
How to Diagnose C0040
- 1Inspect sensor and wiring
- 2Clean sensor
- 3Replace if damaged
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
C0040 requires a scanner that reads chassis modules — basic code readers won't see it.
ArtiLink600
$99
DIYers working on ABS/airbag systems
View on TOPDON
ArtiDiag900 Lite
$299.24
Serious DIYers and side-hustle mechanics
View on TOPDONGot a repair estimate for C0040? Check if the quote is fair before ordering parts.
Parts & Tools for This Job
Common parts shoppers buy for C0040 Right Front Wheel Speed Sensor Circuit.
Brake Pads
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Brake Rotors
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ABS Sensor
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Brake Fluid
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Turn This Into a Confident Next Step
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to C0040.
OEM Manual Evidence
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Exact Vehicle Hubs
Browse →Open the exact vehicle hub grounded by OEM manual evidence related to C0040.
Open the exact vehicle hub grounded by OEM manual evidence related to C0040.
Open the exact vehicle hub grounded by OEM manual evidence related to C0040.
Open the exact vehicle hub grounded by OEM manual evidence related to C0040.
Related Codes
Frequently Asked Questions
- Are wheel speed sensors easy to replace?
- Usually yes — they bolt to the wheel hub or knuckle. One bolt and one connector.
- Can a bad wheel bearing cause this?
- Yes — a worn wheel bearing can cause the tone ring to wobble, giving erratic speed sensor readings.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29