Left Front Sensor Circuit Fault
Your vehicle's left front wheel speed sensor isn't communicating properly with the ABS system. Think of it like a broken speedometer for that wheel—the system can't tell how fast it's spinning, so it can't manage braking correctly.
The ECM monitors the left front wheel speed sensor's voltage signal and frequency to detect wheel slip during braking. It compares the signal strength and pattern against expected thresholds; an open circuit, short, or severely degraded signal triggers the fault. The sensor typically produces an AC signal proportional to wheel speed.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Voltage | 0.2–5.0V AC (varies by sensor type) | Below 0.2V, above 5.5V, or no signal |
| Signal Frequency Deviation | Matches wheel rotation speed | Missing, erratic, or out-of-range pulses |
Code C1713 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, C1713 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.