Chassis, generic

C0657 Left Front Wheel Speed Sensor B Incorrect Component Installed

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

Here the module receives something on the second left front speed channel but decides that the fitted sensor is not the type it expects. No carmaker documents C0657, so the exact detection rule is unknown. A mix-up is easy: Continental designed its dual-element sensor to fit the same mounting position as a conventional single-element sensor, so an ordinary part bolts in without complaint and the second channel is missing or delivers the wrong signal. Allegro's A19350 shows how interchangeable modern chips are: thanks to flexible orientation it can stand in for xMR or Hall sensors, and it uses a pulse-width protocol carrying speed, direction and safety data that the controller must be set up for. GM's old keyword list PIP5094 contains C0657 only as an unrelated earlier number.

Likely causes

Conventional single-channel sensor fitted instead of the dual-channel part
Sensor variant with other protocol or for the other side
Brake module not configured or coded for the fitted sensor

Symptoms

  • Warning appears soon after a sensor or hub replacement
  • Redundant braking or automated driving functions not available

Repair estimate

DifficultyEasyDIY possible
Parts and labour€60–400
Time0.3–1.5 h

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

Parts involved

lf wss b

Related codes

C0651C0656C0555C065E

References: patents.google.com, allegromicro.com, static.nhtsa.gov.