C1176
Speed Wheel Sensor LR Circuit Open
Chassis Chassis/Safety ABS/Speed Sensor 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

The left rear wheel speed sensor isn't sending a signal to the ABS/stability control system because its wiring circuit is broken or disconnected. It's like a speedometer that stopped working—the system can't measure that wheel's speed anymore.

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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 or warning active
Reduced braking performance or ABS function not engaging
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors AC voltage signals from the left rear wheel speed sensor, which spins with the wheel to measure rotational speed. The ECU expects a continuous signal within normal frequency range; an open circuit produces zero or no detectable signal, triggering the fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Wheel Speed Sensor Signal Voltage 0.5–5V AC (varies by speed) No signal or below minimum threshold
Circuit Continuity Continuous resistance path (typically 400–900 ohms) Open circuit or infinite resistance
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wheel speed sensor wiring harness connector
Inspect and reseat the connector at the left rear wheel sensor; corrosion or loose pins often cause open circuits.
2
Wheel speed sensor wiring
Check the wire harness from the sensor to the ABS module for cuts, pinches, or damaged insulation and repair with electrical tape or wire connectors.
3
Left rear wheel speed sensor
Unbolt and replace the sensor if wiring is intact; sensor coils can fail internally causing open circuits.