C0163 code meaning
Left Rear ABS Outlet Solenoid Circuit Malfunction
What C0163 means
None of the reachable J2012 lists, maker indexes or NHTSA bulletins mention C0163, so its use cannot be shown for any vehicle. The title names the outlet solenoid of the left rear brake, the valve that opens during anti-lock control to dump caliper pressure toward the return pump and lets the wheel recover. If it cannot open, the rear wheel may lock; if it sticks open, the rear brake loses pressure during regulation. Electrically, controllers verify the coil with short current pulses: MOTOR describes the ATE module checking every outlet and inlet coil in a fixed sequence and flagging the missing one, and the Toyota/Denso patent cuts all valve power through a relay after such a finding. Bosch places these valves together with the pump in the hydraulic unit.
C0163 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0163
- ABS warning lamp on
- Unstable rear axle under hard braking without ABS
Common causes of C0163
- Most likelyRear left outlet coil open or shorted
- PossiblePoor contact at the hydraulic unit connector
- Less likelyOutlet valve mechanically stuck by contaminated fluid
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
ABS hydraulic unitABS control moduleSolenoid valve
What each part of C0163 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 63 | The exact fault in that area. |
What to do next
- Note C0163 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 C0163
What does C0163 mean?
C0163 means "Left Rear ABS Outlet Solenoid Circuit Malfunction". None of the reachable J2012 lists, maker indexes or NHTSA bulletins mention C0163, so its use cannot be shown for any vehicle. It is a generic code, so it means the same on every make.
Is it safe to drive with C0163?
Drive gently and only to a workshop. With C0163 the car can go into limp mode (reduced power) to protect itself.
Will C0163 fail an emissions test?
C0163 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 C0163 to fix?
Difficulty: hard. A typical repair takes 1.5 to 4 hours of work. This is a job for a workshop.
Will C0163 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.