C0050

C0050 is the right rear wheel speed sensor circuit code and behaves identically to C0045 in nearly every respect, but it is worth its own diagnostic pass because rear-sensor faults are often a paired symptom of a deeper rear-axle problem (leaking pinion seal, failing differential bearing dumping metal into both sides, harness damage from a rubbing brake line). Free first: clear the code, drive a representative loop including a few stops from 30 mph, see what comes back — if both C0045 and C0050 set together you are looking at a shared upstream cause like a blown ABS fuse, an EBCM ground, or harness damage at a common chafe point. Live data: at a steady 25 mph all four wheel speeds should agree within 1 mph; if RR alone drops out above 40 mph the sensor is heat-sensitive and on its way out. Air-gap check with a feeler gauge on passive setups should be 0.020 to 0.050 inch; ohm spec is 1,000 to 2,500 ohms cold. Worst misdiagnosis: assuming the code is the sensor and ignoring a rumbling RR bearing — within 1,000 miles the bearing fails completely, takes out the hub-mounted sensor and the parking-brake actuator, and a $200 job becomes $900.

Vehicle-specific patterns: 2008-2012 Honda Accord — RR WSS internal winding opens at the sensor body itself, no harness damage visible. 2007-2014 Cadillac Escalade/Tahoe/Yukon — RR hub bearing failure with metal shavings contaminating the sensor magnet, GM service info recommends bearing-plus-sensor replacement as a set. 2010-2016 Hyundai Tucson/Kia Sportage — RR harness routes inside the wheel well and gets cut by tire chains or debris. 2005-2010 Subaru Outback/Legacy — rear differential breather fails, diff fluid pushes past axle seal and saturates the WSS connector. Estimated repair: $30 to $600.