🚨 Diagnostic Profile
- Vehicle/Equipment Make: GENERIC
- Technical Description: Right Rear Wheel Speed Sensor B Circuit/Open
This code is a Chassis (C) code monitored by the Electronic Brake Control Module (EBCM) or the integrated ABS/Traction Control module. It indicates that the module has detected an open circuit, a short, or a complete loss of signal from the Right Rear Wheel Speed Sensor (designated ‘B’ circuit). The ABS module relies on a consistent, clean digital signal from this sensor to calculate wheel rotation speed. When the circuit opens—often due to a severed wire, corroded connector pin, or a failed sensor coil—the module cannot verify wheel speed at that corner. As a safety precaution, this typically disables the Anti-lock Braking System, Traction Control, and Electronic Stability Control functions until the fault is cleared, often illuminating the ABS and Stability Control warning lights on the dash.
🚨 Repair Difficulty Tier
- Difficulty Rating: Intermediate
While physically accessing the wheel speed sensor is usually straightforward, accurately diagnosing an “open circuit” requires a digital multimeter to check for resistance and continuity, as well as a capable scan tool to read live ABS data and confirm the repair. This is suitable for an experienced DIYer with electrical testing knowledge, though wiring harness repairs near the suspension can be tricky for beginners.
🛠️ Resolution Steps
- Step 1: Preliminary Inspection
Start by visually inspecting the right rear wheel speed sensor and its connector. Look for the sensor being unseated from the knuckle or exciter ring, and check the wiring harness for signs of chafing, pinching (often near the strut or trailing arm), or corrosion at the connector pins caused by road salt or water intrusion. - Step 2: Diagnostic Verification
Disconnect the sensor’s electrical connector and use a digital multimeter to check the resistance across the sensor terminals; compare the reading to manufacturer specifications (an infinite reading typically confirms an open circuit). Additionally, use a scan tool to monitor live wheel speed data for all four corners while slowly rolling the vehicle to see if the Right Rear sensor shows a signal dropout or flatline compared to the other wheels. - Step 3: Resolution & Reset Process
If the sensor itself tests open, replace the wheel speed sensor; if the sensor passes the resistance test but the wiring is damaged or corroded, repair or replace the damaged section of the harness and connector. After the repair, clear the stored code with the scan tool and perform a test drive to confirm the ABS/Stability Control lights remain off and the live data streams properly.
📦 Parts, Labor, and Budget Estimates
- Required Components/Software: Right Rear Wheel Speed Sensor, Wiring Harness Repair Kit/Connector (if needed), OBD-II Scan Tool with ABS capability, Digital Multimeter
- Average Component Price: $45 – $120 USD
- Estimated Labor Hours: 0.5 – 1.5 hours
- Total Estimated Budget: $100 – $280 USD