RightRear Sensor Circuit Short to Vbat
The right rear wheel speed sensor is sending a signal that's stuck at battery voltage instead of properly varying as the wheel rotates. It's like a light switch that's jammed in the on position—it should be flickering but stays constant.
The ECU monitors the right rear ABS sensor circuit voltage, expecting dynamic AC signals that vary with wheel speed. When the sensor shorts to battery voltage (Vbat), the ECU detects a constant high-voltage condition instead of the normal oscillating pattern, triggering a fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Signal Voltage | 0.5–3.5V AC (varying with wheel speed) | Continuously at Vbat (~12V DC, no variation) |
| Signal Frequency | 5–100+ Hz (speed dependent) | No frequency detected or constant DC |
Code C1702 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, C1702 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.