C065A code meaning
Right Front Wheel Speed Sensor B Circuit Low
What C065A means
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.
C065A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C065A
- Warning for brake or driver assistance system right after switching on
- Redundant braking or automated driving not available
Common causes of C065A
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rf wss bSensor wiring
What each part of C065A means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5A | The exact fault in that area. |
What to do next
- Note C065A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C065A
What does C065A mean?
C065A means "Right Front Wheel Speed Sensor B Circuit Low". C065A means the current in the circuit of right front sensor B stays below its lowest valid level. It is a generic code, so it means the same on every make.
Is it safe to drive with C065A?
Drive gently and only to a workshop. With C065A the car can go into limp mode (reduced power) to protect itself.
Will C065A fail an emissions test?
C065A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C065A to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will C065A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.