C065F code meaning
Left Rear Wheel Speed Sensor B Circuit/Open
What C065F means
C065F reports that the second speed channel at the left rear wheel has no closed circuit. No carmaker publishes this code and no service bulletin mentions it, so the exact test is unknown. With active sensors an open is easy to recognise: NXP's KMI25 draws a constant base current of about 7 mA through the same two wires that carry its speed pulses, so a broken lead or a loose plug leaves the module with no current at all. A Motor magazine test on Honda sensors found 10 to 11 V supplied by the ABS unit and stressed that the sensor goes silent once that feed is lost, which is why the supply is checked before the sensor is condemned. As long as sensor A still works, ABS normally carries on; functions that need the second signal are withdrawn.
C065F 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 C065F
- Warning for brake or driver assistance system right after switching on
- Functions relying on the second rear left signal not available
Common causes of C065F
- Most likelyBroken lead or loose, corroded plug between sensor and module
- PossibleSensor B open internally
- Less likelySupply output for channel B in the brake module not switched on
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Lr wss bSensor wiring
What each part of C065F means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5F | The exact fault in that area. |
What to do next
- Note C065F 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 C065F
What does C065F mean?
C065F means "Left Rear Wheel Speed Sensor B Circuit/Open". C065F reports that the second speed channel at the left rear wheel has no closed circuit. It is a generic code, so it means the same on every make.
Is it safe to drive with C065F?
Drive gently and only to a workshop. With C065F the car can go into limp mode (reduced power) to protect itself.
Will C065F fail an emissions test?
C065F 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 C065F to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will C065F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.