C0040
Medium SeverityRight Front Wheel Speed Sensor Circuit
Chassis/Brakes System
What Does C0040 Mean?
ABS lost signal from the right front wheel speed sensor.
Common Fix
Replace wheel speed sensor
Estimated Cost (DIY)
$20 - $60
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.
Related Resources
Repair guides, symptom pages, and wiring diagrams related to C0040.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali AWD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali 2WD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-6.0L Service Manual | Operation CHARM Operation CHARM : Car repair...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-5.3L Service Manual | Operation CHARM Operation CHARM : Car repair...
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.