Speed Wheel Sensor RF Input Circuit Failure
The right-front wheel speed sensor isn't sending a proper signal to your car's computer, like a broken speedometer for just one wheel. This prevents your ABS and traction control from working correctly.
The ECU monitors the AC voltage signal from the right-front wheel speed sensor, which generates pulses as the wheel rotates. The sensor circuit must produce a minimum voltage amplitude and consistent frequency; if the signal drops below threshold or stops entirely, the fault triggers. The ECU compares RF sensor data against other wheel sensors to detect circuit failures.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Signal Voltage Amplitude | 0.5–2.0V AC at wheel rotation | Below 0.3V or no signal detected |
| Sensor Frequency Consistency | Continuous pulse pattern during motion | Intermittent, erratic, or absent pulses |
Code C1145 is classified as a serious fault. If your check engine light is flashing — not just steady — pull over safely and do not continue driving. A flashing CEL indicates an active misfire or critical failure that can cause catalytic converter damage within minutes or permanent engine harm within miles. Contact a certified mechanic immediately. Do not attempt roadside repairs on high-severity codes unless you are trained to do so.
Once the fault is repaired, C1145 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.