What Does C1145 Mean?
This code indicates the ABS control module has detected a general input circuit failure for the right front wheel speed sensor. The module is unable to read a valid speed signal from the RF sensor, which could be due to an electrical open, short, or signal quality issue. This differs from specific open/short codes by indicating the module detected an abnormal signal that does not clearly fit one fault category.
Safety Warning
ABS and traction control are likely disabled. Braking performance on slippery surfaces is reduced. Repair promptly.
Common Causes
35%
Failed right front wheel speed sensor with degraded internal coil or magnetic element
25%
Damaged or corroded wiring between the sensor and ABS module from wheel well exposure to moisture and road salt
20%
Excessive air gap between sensor and tone ring from wheel bearing wear or sensor displacement
15%
Corroded or loose connector at the sensor or ABS module preventing reliable signal transmission
5%
ABS module internal failure on the RF sensor input circuit
Diagnostic Steps
1
Step 1: Inspect the RF wheel speed sensor, wiring, and connector for physical damage, corrosion, or contamination. Verify the sensor is properly seated in its mounting bore.
2
Step 2: Measure sensor resistance with a multimeter (typical 800-1400 ohms for passive sensors). Compare left and right front readings — they should be within 10% of each other.
3
Step 3: Check the sensor air gap (0.020-0.050 inches typical) and inspect the tone ring for damage or debris.
4
Step 4: Test wiring continuity from the sensor connector to the ABS module connector. Check for shorts to ground, shorts to battery, and high resistance connections.
5
Step 5: Compare RF wheel speed in live data against other wheels while test driving. Clear codes and verify no return above 15 mph.
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected a general input circuit failure for the right front wheel speed sensor. The module is unable to read a valid speed signal from the RF sensor, which could be due to an electrical open, short, or signal quality issue. This differs from specific o...
The most common cause of C1145 (Speed Wheel Sensor RF Input Circuit Failure) is: Failed right front wheel speed sensor with degraded internal coil or magnetic element
Typical repair costs for C1145 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control are likely disabled. Braking performance on slippery surfaces is reduced. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1145 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS) / Traction Control System
Difficulty
Type
Manufacturer
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