C0040 on Jeep
Right Front Wheel Speed Sensor Circuit
C0040 on Jeep vehicles indicates right front wheel speed sensor circuit. Au7o has documented this code across 2 Jeep models — most commonly on Grand Wagoneer, Wrangler. 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. Typical repair costs on Jeep range from $150 to $1,200, depending on the specific model and root cause.
Common Causes of C0040
- •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)
C0040 on Jeep by Model
Jeep Grand Wagoneer(1 issue)
- Electronic Stability Control/ABS warning with wheel speed sensor or tone ring faults2022-2024
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.
Jeep Wrangler(1 issue)
- Front Wheel Hub/Bearing Assembly Failure (Integrated ABS Sensor) — Grinding & ABS Light2007-2025
Front (and sometimes rear) sealed wheel hub/bearing assemblies are a high-wear item on JK and JL Wranglers, especially on lifted rigs running larger tires that load the bearing harder. As the bearing wears it produces a speed-dependent grinding, rumbling, or humming that changes when turning, and free play can be felt by rocking the tire at the 12-and-6 positions. Because the ABS wheel-speed sensor (tone ring/sensor) is integrated into the hub assembly on these models, a failing hub commonly damages the sensor and triggers ABS and traction-control (ESC) warning lights along with disabled stability control. The common service hub assembly for 2007-2016 5-lug JK with ABS is part 513272 (Mopar/MOOG/Timken/Spicer equivalents); note a JK hub part-number change around 2011, so the correct year-specific part must be used.
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What does C0040 mean on 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 specifically, this code is documented across 2 models.
What causes C0040 on Jeep vehicles?▼
Common causes on Jeep: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0040 on a Jeep?▼
Repair costs on Jeep range from $150 to $1,200, depending on the specific model and root cause.
Which Jeep models have C0040 documented?▼
Au7o has documented C0040 on 2 Jeep models: Grand Wagoneer, Wrangler.