Chassis, generic

C0506 Right Front Wheel Speed Sensor A Circuit/Open

Check engine lightOn

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

C0506 reports an open or grounded circuit at the right front wheel speed sensor. GM's 2023 tables describe it as a grounded or interrupted line, recognized from the signal-line current: below 3.8 mA for 0.12 s, Type A, and only evaluated after the start-up sensor test has finished without a supply undervoltage. On GM's 2019 platform an open drawing under 3.5 mA is filed as C0508 instead, so the same broken wire can carry different numbers. Mitsubishi assigns C1063-13 to C0506 and warns not to replace the ABS unit for a code that is stored but not active; it may simply mean the car was not driven after the last repair. HELLA advises checking supply voltage and wiring with a multimeter, as the internal resistance of active sensors cannot be measured.

Likely causes

Broken wire or open contact between ABS module and right front sensor

Right front sensor failed open

Old stored code after repair, vehicle not yet driven

Symptoms

ABS, ESC and traction control lamps on from start-up
Right front wheel speed reads zero in live data

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 rfsensor wiring

References: gsi.ext.gm.com, mitsubishitechinfo.com, hella.com.