C0669Right Rear Wheel Speed Sensor B Circuit High
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- With C0669 the second right rear speed channel shows a level above the valid range, which usually means it is connected to a voltage source it should not see. No carmaker publishes this code. Sensor chips are built to survive such faults for a while: NXP builds the input die of the KMI25 with a process rated for high voltage, precisely to shield the measuring parts from the harsh conditions on the supply line. For the older KMI15 NXP recommends extra parts against voltage spikes and reverse polarity and notes that many vehicle networks already cap load-dump surges at about 40 V. The brake module, however, will not accept the reading and shuts the channel off until the short to battery, the damaged lead or the faulty sensor has been dealt with.
- What you may notice
- Warning lamp right after switching on
- Channel B switched off, assistance functions reduced
- Likely causes
- LikelySignal lead shorted to battery voltage
- PossibleRepaired or replacement harness wired to the wrong pins
- RareSensor B shorted internally
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.