C0040 on RAM: How to Diagnose & Fix
Right Front Wheel Speed Sensor Circuit
1 RAM model · 1 documented issue · $200-$600 repair
C0040 on RAM by model: symptoms, diagnosis and fix
4th-gen Ram 1500 front wheel bearing/hub assemblies wear out relatively early (some as low as ~50k miles), producing a humming or growling noise that rises with speed and changes with steering load. Because the wheel-speed sensor is integrated into the hub, a failing bearing frequently also sets an ABS/traction fault and light. It is one of the most common front-end noise complaints on these trucks.
Common Symptoms
- Humming/growling that grows with speed
- Noise changes when turning left/right
- ABS or traction control light
- Wheel play/looseness
- Vibration through the floor
How to Fix
Confirm by road test (noise increases with speed, shifts when loading the bearing on turns) and check for play. Replace the affected front wheel bearing/hub assembly (unit-bearing with integrated ABS sensor); replace in pairs if both show wear. Torque the axle nut to spec. Some owners periodically grease through the ABS-sensor hole to extend life, but replacement is the fix once noise/ABS fault appears.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Timken HA590354 front wheel hub and bearing assembly
Confirm build date, drive and OE cross-reference.
- Genuine Mopar 68267298AD front hub and bearing assembly
For 2012, use Timken HA590515 or verify the OE supersession by VIN. Confirm RWD/4WD and production details.
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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 RAM?
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 RAM it is documented across 1 model: 1500.
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 RAM?
Published repair estimates on RAM range from $200 to $600 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.