C065ARight Front Wheel Speed Sensor B Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C065A means the current in the circuit of right front sensor B stays below its lowest valid level. TI's TPIC7218-Q1, an interface chip that powers and reads four wheel speed sensors, rates a current under about 4.5 mA as undercurrent and labels it a possible short to ground. A low reading can also come from the sensor itself: Infineon's TLE5046SiC drops to a constant error current of at most 3.8 mA when it detects an internal fault, and falls back to that level too when its supply sinks below 3.5 V. So the supply voltage at the plug is the first thing to measure. Normal levels for such sensors are 7 and 14 mA, plus 28 mA for the speed pulse in the AK protocol. No carmaker publishes C065A; the left front counterpart is C0653.
- What you may notice
- Warning for brake or driver assistance system right after switching on
- Redundant braking or automated driving not available
- Likely causes
- LikelySignal line chafed through and touching ground
- PossibleSupply at the sensor too low, e.g. from contact resistance
- PossibleSensor reports an internal fault with its error current
- 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.