C0506 code meaning
Right Front Wheel Speed Sensor A Circuit/Open
Chassis system Generic code C05xx codes Check engine light
What C0506 means
C0506 reports an open or grounded circuit at the right front wheel speed sensor. GM's 2023 tables describe it as a grounded or interrupted line, recognized from the signal-line current: below 3.8 mA for 0.12 s, Type A, and only evaluated after the start-up sensor test has finished without a supply undervoltage. On GM's 2019 platform an open drawing under 3.5 mA is filed as C0508 instead, so the same broken wire can carry different numbers. Mitsubishi assigns C1063-13 to C0506 and warns not to replace the ABS unit for a code that is stored but not active; it may simply mean the car was not driven after the last repair. HELLA advises checking supply voltage and wiring with a multimeter, as the internal resistance of active sensors cannot be measured.
C0506 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0506
- ABS, ESC and traction control lamps on from start-up
- Right front wheel speed reads zero in live data
Common causes of C0506
- Most likelyBroken wire or open contact between ABS module and right front sensor
- PossibleRight front sensor failed open
- Less likelyOld stored code after repair, vehicle not yet driven
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wss rfSensor wiring
What each part of C0506 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 06 | The exact fault in that area. |
What to do next
- Note C0506 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 C0506
What does C0506 mean?
C0506 means "Right Front Wheel Speed Sensor A Circuit/Open". C0506 reports an open or grounded circuit at the right front wheel speed sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with C0506?
Drive gently and only to a workshop. With C0506 the car can go into limp mode (reduced power) to protect itself.
Will C0506 fail an emissions test?
C0506 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 C0506 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0506 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.