Speed Wheel Sensor LR Circuit Open
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.
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.
| 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 |
Code C1176 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, C1176 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.