Right Rear Wheel Speed Sensor Circuit Failure
The C1704 code indicates that the ABS control module has detected a fault in the right rear wheel speed sensor circuit. This can be caused by an open or shorted sensor, damaged wiring or connectors, a faulty tone ring, or an internal ABS module failure. As a result, the ABS, traction control, and electronic stability control (ESC) systems are disabled for that wheel, compromising vehicle safety.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty right rear wheel speed sensor (open or shorted internal coil)
- Damaged, corroded, or disconnected wiring or connector at the right rear sensor (often due to suspension rubbing)
- Damaged, dirty, or missing tone ring (reluctor) on the right rear hub/bearing assembly
- Internal failure of the ABS hydraulic control unit (HCU) or ABS control module
3. Symptoms You Will Notice
- ABS warning light illuminated on the dashboard
- Traction control and stability control warning lights on
- ABS, traction control, and ESC systems may be disabled or inoperative
- Possible loss of braking assist under certain conditions
4. Step-by-Step Diagnosis
Scan the ABS module for trouble codes and record freeze frame data
Visually inspect the right rear wheel speed sensor wiring and connector for damage, corrosion, or loose connection
Measure the sensor resistance and compare to specifications (typically 1-2 kΩ); check for shorts to ground or voltage
Inspect the tone ring for damage, debris, or missing teeth; clean or replace as needed
If sensor and wiring are good, test the ABS module output signals; replace the module if internal fault is suspected
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is not recommended because the ABS, traction control, and stability control are disabled, increasing the risk of skidding or loss of control, especially in slippery conditions. Have the vehicle repaired as soon as possible.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400 for a sensor replacement, including parts and labor. If the tone ring or hub bearing needs replacement, costs can be $300–$600. ABS module replacement may exceed $1,000.