What Does C1146 Mean?
This code indicates the ABS control module has detected an open circuit condition in the right front wheel speed sensor circuit. An open circuit means there is a break in the electrical path between the sensor and the module, resulting in no signal at all. This is typically caused by a broken wire, disconnected connector, or a sensor with an internally open coil.
Safety Warning
ABS and traction control are disabled. The module has no RF wheel speed data. Repair promptly to restore full brake system capability.
Common Causes
30%
Broken wire in the RF wheel speed sensor harness from repeated steering/suspension movement or road debris damage
25%
Disconnected or backed-out connector at the sensor or at an intermediate junction point
25%
Failed wheel speed sensor with an internally open coil from thermal stress or vibration fatigue
20%
Corroded connector terminals with high resistance contact that effectively creates an open circuit
Diagnostic Steps
1
Step 1: Verify the RF wheel speed sensor connector is fully seated and locked. Check for backed-out pins by gently tugging on individual wires at the connector.
2
Step 2: Measure the sensor coil resistance (typical 800-1400 ohms). An infinite (OL) reading indicates an open coil and the sensor must be replaced.
3
Step 3: If sensor resistance is normal, check wiring continuity from the sensor connector all the way to the ABS module connector on both signal and ground wires. An open will read infinite resistance.
4
Step 4: If an open is found in the harness, trace the wire and locate the exact break point. Common failure points are at flex areas near the steering knuckle and at the body-to-frame transition.
5
Step 5: Repair the open circuit or replace the sensor, clear codes, and test drive above 15 mph to confirm proper RF speed signal.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected an open circuit condition in the right front wheel speed sensor circuit. An open circuit means there is a break in the electrical path between the sensor and the module, resulting in no signal at all. This is typically caused by a broken wire, ...
The most common cause of C1146 (Speed Wheel Sensor RF Circuit Open) is: Broken wire in the RF wheel speed sensor harness from repeated steering/suspension movement or road debris damage
Typical repair costs for C1146 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control are disabled. The module has no RF wheel speed data. Repair promptly to restore full brake system capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1146 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS) / Traction Control System
Difficulty
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