Left Rear Center Sensor Circuit Failure
The left rear wheel speed sensor isn't sending proper signals to the ABS/stability control computer, like a broken speedometer for just that wheel. The system can't monitor that wheel's speed, which breaks anti-lock braking and traction control functions.
The ABS module monitors voltage and frequency signals from the left rear wheel speed sensor to detect wheel slip and speed changes. It compares the sensor's AC signal amplitude and frequency against expected thresholds based on vehicle speed. When voltage is out of range, frequency is absent, or resistance is abnormal, the circuit fails.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Voltage | 0.5-2.0V AC (varies with wheel speed) | Below 0.2V or no signal detected |
| Sensor Resistance | 800-1200 ohms | Open circuit (infinite) or shorted (near 0 ohms) |
Code C1706 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, C1706 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.