P205F code meaning
Reductant System Performance (Bank 2)
Powertrain system Generic code P20xx codes Check engine light
What P205F means
P205F is the Bank 2 version of the reductant system performance check, meant for engines in which the second cylinder bank has its own SCR branch with separate pressure supply or valve. It applies when that branch is electrically sound but fails to reach or regulate the pressure or quantity the controller asks for. No manufacturer publicly documents P205F; even a V-engine such as Ram's 3.0 L EcoDiesel V6 lists delivery problems as P204F in its bulletins. The Bank 1 logic gives orientation: GM's 6.6 L LML waits for 30 failed build-up attempts below 350 kPa before setting a Type A code. CARB requires every SCR system to detect delivery faults before emissions exceed the limits. Look for blocked lines, a sticking valve or crystallised DEF in the second branch.
P205F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P205F
- MIL and DEF warning on
- Higher NOx from Bank 2, possible inducement
Common causes of P205F
- Most likelyBlocked or frozen DEF line to the Bank 2 branch
- PossibleBank 2 injector sticking due to DEF crystals
- PossibleInsufficient pump or metering unit pressure for the second branch
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant pumpReductant metering unitReductant linesReductant injection valve
What each part of P205F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 5F | The exact fault in that area. |
What to do next
- Note P205F 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 P205F
What does P205F mean?
P205F means "Reductant System Performance (Bank 2)". P205F is the Bank 2 version of the reductant system performance check, meant for engines in which the second cylinder bank has its own SCR branch with separate pressure supply or valve. It is a generic code, so it means the same on every make.
Is it safe to drive with P205F?
Drive gently and only to a workshop. With P205F the car can go into limp mode (reduced power) to protect itself.
Will P205F fail an emissions test?
Yes, it can. P205F 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 P205F to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P205F 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.