C050A code meaning
Right Front Wheel Speed Sensor A Intermittent/Erratic
Chassis system Generic code C05xx codes Check engine light
What C050A means
C050A is the erratic-signal code for the right front sensor. GM's 2019 tables show how this is judged: an unfiltered wheel acceleration above 491 m/s² feeds a counter that latches the fault at 40 s and decays again on clean readings, so only persistently unrealistic jumps set it; a separate check trips when the edge count exceeds 55 (25 ms). Listed causes are a loosely mounted sensor, missing tone-ring teeth and electromagnetic interference. GM preliminary information PIT5707 for 2020 Silverado and Sierra HD trucks found metal debris on the front reluctor ring; its labor time for removing the hub and cleaning is 1.1 h. HELLA adds heavy dirt and increased bearing play as typical sensor faults. Mitsubishi assigns C1063-38 to C050A with a two-trip MIL.
C050A 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 repairAfter a drive cycle
Symptoms of C050A
- ABS lamp and stability system message that appear and disappear
- Pulsing brake pedal or ABS action at low speed without wheel lock
Common causes of C050A
- Most likelyMetal debris or heavy dirt on the right front reluctor ring
- PossibleMissing tone-ring teeth or excessive wheel bearing play
- Less likelyElectromagnetic interference or intermittent contact in the harness
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wss rfTone ring rfSensor wiring
What each part of C050A means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0A | The exact fault in that area. |
What to do next
- Note C050A 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 C050A
What does C050A mean?
C050A means "Right Front Wheel Speed Sensor A Intermittent/Erratic". C050A is the erratic-signal code for the right front sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with C050A?
Drive gently and only to a workshop. With C050A the car can go into limp mode (reduced power) to protect itself.
Will C050A fail an emissions test?
C050A 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 C050A 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 C050A clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.