C1145
Speed Wheel Sensor RF Input Circuit Failure
Chassis Chassis/Safety ABS Wheel Speed Sensor 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

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.

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Symptoms You May Notice
3 known symptoms for this code
ABS warning light illuminated on dashboard
Traction control or stability control disabled
ABS brakes feel soft or unresponsive in emergency stops
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Embedded Systems Insight
What the ECU/ECM is actually computing

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.

Voltage & Parameter Thresholds

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
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wheel speed sensor wiring and connector
Inspect the RF wheel sensor connector for corrosion, loose pins, or water damage; clean or reseat the connection.
2
Right-front wheel speed sensor
Remove the sensor from the wheel hub, inspect for damage or magnetic debris, clean the sensor tip, and reinstall firmly.
3
Right-front wheel speed sensor (replacement)
If inspection reveals cracks or internal damage, replace the sensor with an OEM or quality aftermarket unit.