Code C0512 indicates that the ABS control module has detected an open circuit in the right rear wheel speed sensor circuit. This means the electrical path from the sensor to the module is broken, preventing the module from receiving a speed signal from that wheel. The ABS and related stability systems will be disabled as a result.
The sensor itself has failed internally, often due to exposure to moisture, debris, or physical impact, causing an open circuit. This is the most common cause.
Wiring near the sensor can become frayed, broken, or corroded from road debris, flexing, or environmental exposure, interrupting the circuit.
The electrical connector at the sensor may be loose, disconnected, or have corroded terminals, preventing proper contact.
A break in the wire somewhere along the harness, often due to chafing against the chassis or damage from repairs, can cause an open circuit.
Rarely, the ABS module itself has an internal fault in the circuit for that sensor input. This should only be considered after all external wiring and sensor checks are exhausted.
The vehicle can be driven, but the ABS and stability control systems will be disabled. Braking may result in wheel lockup, especially on slippery surfaces, so drive cautiously and avoid hard braking.
No, the ABS module is rarely the cause. The sensor, its connector, or wiring are far more common failure points. Always rule out these simpler issues first.
No, this is a hard fault. After fixing the open circuit, the code must be cleared with a scan tool, and the ABS module may need to see a valid signal before the warning lights turn off.
That is almost certainly incorrect. The wheel speed sensor circuit is monitored by the ABS module, not the engine computer (PCM/ECM). Replacing the PCM will not fix an open circuit in the right rear sensor and is an unnecessary expense.