C1190
Speed Wheel Sensor LF Input Short Circuit To Battery
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 left front wheel speed sensor is sending a signal that's shorted directly to the vehicle's battery voltage instead of the normal sensor signal. It's like a wire touching the positive battery terminal when it should be sending pulses to the computer.

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Symptoms You May Notice
3 known symptoms for this code
ABS warning light illuminated on dashboard
Traction control disabled or malfunction
Loss of anti-lock braking function
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the wheel speed sensor voltage output, expecting alternating AC signals between 0-5V as the wheel rotates. When the sensor shorts to battery voltage (typically 12V+), the ECU detects a constant high voltage state instead of the normal pulsing pattern, triggering the fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor Output Voltage 0-5V AC (pulsing) Constant 12V+ DC (shorted to battery)
Signal Pattern Regular alternating pulses Sustained high voltage, no variation
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect the LF wheel speed sensor connector for corrosion, bent pins, or loose connections and reseat firmly.
2
Wiring and insulation
Trace the sensor wiring from wheel hub to ECU for damaged insulation or pinched wires that may be grounding to battery voltage.
3
Left front wheel speed sensor
Replace the sensor if wiring appears intact, as internal short circuit in the sensor itself is likely.