Chassis, generic

C0512 Right Rear Wheel Speed Sensor A Circuit/Open

Check engine lightOn

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

C0512 is the open-circuit code for the right rear wheel. GM's 2016 hybrid tables run the check only after the sensor self-test has finished and system voltage is above 6.9 V; then 0.12 s with less than 3.8 mA flowing in the signal wire is enough for a Type A entry. The XT4 section of GM's 2019 tables words the same test as a ground short or interruption and monitors the supply line separately. Mitsubishi assigns C1067-13 to C0512 with a delay of at most one second and lists harness, sensor and the brake unit's power feed as suspects. Because an active sensor modulates a two-wire current, as Bosch describes it, a reading near zero cannot be a slow wheel; it points to a broken lead, an unplugged connector or a dead sensor.

Likely causes

Broken lead or unplugged connector at the right rear

Right rear sensor open internally

Fuse or power feed of the brake module (Mitsubishi lists it)

Symptoms

ABS and stability lamps on at key-on, sometimes the MIL
Right rear wheel speed reads zero in live data
ABS and traction control unavailable

Repair estimate

DifficultyMediumDIY possible

Parts and labour€30–400

Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

wss rrsensor wiring

References: gsi.ext.gm.com, gsi.ext.gm.com, mitsubishitechinfo.com, bosch-mobility.com.