C0665Left Rear 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
- C0665 says the part on the second left rear speed channel is not the one the module expects. No carmaker documents the code or how it identifies the part. Typical mix-ups arise at the wheel bearing. Motor magazine describes bearings whose magnetic encoder ring sits on the inboard face: pressed in the wrong way round, nothing passes the sensor and speed codes appear right after the repair, while the reversed bearing is usually ruined. On the sensor side, NXP sells the KMI25 in two variants, one for magnetised multipole rings and one for steel gear wheels, so a sensor matched to the other encoder type will not work properly. GM's PIP5094 lists C0665 merely as an earlier GM number with another meaning.
- What you may notice
- Warning appears right after a bearing, hub or sensor replacement
- Redundant brake functions not available
- Likely causes
- LikelyWheel bearing fitted with the encoder facing away from the sensor
- PossibleSensor made for a different encoder type or vehicle
- RareReplacement hub without encoder ring fitted
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.