P285A code meaning
Clutch B Pressure Disengagement Performance/Too Low
Powertrain system Generic code P28xx codes Check engine light
What P285A means
With P285A the module reports a release-side pressure fault involving clutch B. Mitsubishi's Mirage CVT evaluates it while the auxiliary gearbox is commanded into its second stage: a ratio that remains within 10 % of the first stage (1.639–2.003) for 0.5 s, or that drops to 0.500 or below or climbs to 1.500 or above for 0.2 s, sets the code. On the Nissan Kicks and Versa the number carries extra weight: if it appears together with P0875, the fluid pressure switch D code, Nissan has the control valve replaced straight away without the belt inspection required for the other codes. In daily driving the car may refuse the upper stage, flare between shifts or drop into a limp program, while the lower stage often stays usable.
P285A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P285A
- Upper stage or even gears not available
- Flare between shifts, then a hard engagement
- Limp mode with warning lamp
Common causes of P285A
- Most likelyDefective control valve, especially when P0875 is stored at the same time
- PossibleLeak in the clutch B circuit preventing a clean handover
- Less likelyFaulty clutch pressure switch or its wiring
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Clutch bClutch actuator bTransmission pump
What each part of P285A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| 5A | The exact fault in that area. |
What to do next
- Note P285A 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 P285A
What does P285A mean?
P285A means "Clutch B Pressure Disengagement Performance/Too Low". With P285A the module reports a release-side pressure fault involving clutch B. It is a generic code, so it means the same on every make.
Is it safe to drive with P285A?
Drive gently and only to a workshop. With P285A the car can go into limp mode (reduced power) to protect itself.
Will P285A fail an emissions test?
Yes, it can. P285A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P285A to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P285A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.