Chassis, generic

C065C Right Front Wheel Speed Sensor B Intermittent/Erratic

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

C065C describes a second right front speed signal that vanishes now and then or carries irregular pulses. With AK protocol sensors, Pico's oscilloscope guide shows that the sensor keeps sending a data packet roughly every 147 ms even while the wheel stands still, so a break in that rhythm exposes a loose contact without the car moving. Pico also notes that some data bits are assigned by the sensor or vehicle maker, and that filtering helps to separate noise from real pulses when measuring. Inside Infineon's TLE5046SiC one safety check fires when more than two consecutive pulses appear on the speed path without a matching event on the direction path, or the reverse, and an EMC feature rides through short supply interruptions. No carmaker documents C065C.

Likely causes

Loose contact in plug or cable, often where the cable flexes with steering
Encoder ring with dirt, metal chips or cracks
Interference from nearby high-current lines or damaged shielding

Symptoms

  • Warning that comes and goes, e.g. on rough roads or while steering
  • Automated or redundant brake functions intermittently withdrawn

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–700
Time0.5–3 h

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

Parts involved

rf wss bsensor wiringtone ring

Related codes

C0658C0659C050AC0655

References: picoauto.com, infineon.com.