C0040 on Jeep: How to Diagnose & Fix
Right Front Wheel Speed Sensor Circuit
2 Jeep models · 2 documented issues · 1 critical · $180-$1,200 repair
C0040 on Jeep by model: symptoms, diagnosis and fix
NHTSA complaints and owner reports describe intermittent ABS/ESC warnings on Grand Wagoneer tied to wheel speed sensor signal loss or erratic readings, sometimes after wet weather or road debris impacts. When the system detects implausible wheel speed data, it can disable ABS/ESC functions and illuminate multiple warnings.
Common Symptoms
- ABS light on
- ESC/traction control light on
- Cruise control disabled
- Brake pedal pulsation changes or ABS inoperative message
- Intermittent warnings that reset after key cycle
How to Fix
Scan for ABS module faults, inspect wheel speed sensors and wiring at each hub, and check tone rings/encoder surfaces for damage or contamination. Replace the affected wheel speed sensor/hub assembly as needed and clear codes; verify with a road test and live wheel-speed data.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar 68609615AA front-left wheel-speed sensor with auto levelOEMMopar 68609615AA
Front-left sensor replacement after live data and circuit inspection isolate that corner on an auto-level vehicle Fitment/availability: 2022-2025 Grand Wagoneer, driver-side front, with auto level. Not the passenger side, rear axle or wi…
- Genuine Mopar 68609616AA front-right wheel-speed sensor with auto levelOEMMopar 68609616AA
Front-right sensor replacement after live data and circuit inspection isolate that corner on an auto-level vehicle Fitment/availability: 2022-2024 Grand Wagoneer, passenger-side front, with auto level. Not the driver side, rear axle or w…
- Genuine Mopar 68424418AD front wheel-speed sensor without auto levelOEMMopar 68424418AD
Front sensor replacement after diagnosis on a vehicle confirmed not to have auto level Fitment/availability: 2022 Grand Wagoneer front left or right without auto level according to the exact catalog. Confirm VIN and later-year supersessi…
- Genuine Mopar 68422140AA front hub-and-bearing assemblyOEMMopar 68422140AA
Confirm VIN/current supersession and do not use for an isolated sensor/wiring fault or rear axle.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
The front hub-and-bearing assemblies are a wear item on the Patriot rather than a lifetime part, and owners report failures well under 100,000 miles. The signature is a low grinding or whirring hum that rises with road speed and changes when the vehicle is loaded in a corner - louder turning one direction, quieter the other. Because the ABS tone ring is integral to the bearing on this platform, a failing bearing frequently trips the ABS, ESP/BAS and traction-control lights together, which sends owners chasing a wheel-speed sensor that is not actually bad. Forum owners note that a bearing can be audibly failing for a long time while still showing no play at the 12-and-6 rock test, so a no-play result does not clear it.
Common Symptoms
- Growling or humming that increases with vehicle speed
- Noise changes when turning or swerving
- ABS, ESP/BAS and traction control lights on together
- Occasional wheel-speed sensor code
How to Fix
Diagnose by road speed rather than engine speed, and load-test by swerving gently side to side; a chassis-ear or listening to each hub with the wheels spun off the ground confirms which corner. The Patriot uses a sealed hub assembly, so the fix is a complete hub-and-bearing unit per side, roughly $180-$400 per corner installed. Replacing the hub normally clears the ABS/ESP lights without touching the sensor. No recall covers wheel bearings on this nameplate.
Sources for this issue (3)
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 Jeep?
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 Jeep it is documented across 2 models: Grand Wagoneer, Patriot.
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 Jeep?
Published repair estimates on Jeep range from $180 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.