C0657Left Front Wheel Speed Sensor B Incorrect Component Installed
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Warning appears soon after a sensor or hub replacement
- Redundant braking or automated driving functions not available
- Likely causes
- LikelyConventional single-channel sensor fitted instead of the dual-channel part
- PossibleSensor variant with other protocol or for the other side
- RareBrake module not configured or coded for the fitted sensor
- Repair
- Easy · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.