C0040 on Nissan: How to Diagnose & Fix
Right Front Wheel Speed Sensor Circuit
1 Nissan model · 1 documented issue · $400-$1,200 repair
C0040 on Nissan by model: symptoms, diagnosis and fix
Early 370Z models can experience brake actuator relay failures, which affect the ABS and vehicle stability control systems. This can cause warning lights on the dash and may affect brake performance in emergency situations.
Common Symptoms
- ABS warning light on
- VDC/Slip light on
- Brake warning light
- ABS activating unexpectedly
- Stability control not functioning
How to Fix
Replace brake actuator assembly. Nissan extended warranty coverage for this issue on affected model years. Update BCM software to latest version. Clear codes after repair and perform test drive to verify proper operation.
Owner tips & cautions
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Nissan 370Z forums and owner groups for real-world experiences and DIY guides
- TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
Sources for this issue (2)
C0040 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C0040 mean on a Nissan?
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 Nissan it is documented across 1 model: 370Z.
What are the most common causes of C0040?
The most common causes of C0040 are: 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). The specific cause varies by vehicle.
How much does it cost to fix C0040 on a Nissan?
Published repair estimates on Nissan range from $400 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C0040 on a different make?
View C0040 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.