P027F code meaning
Cold Start Fuel Injection Quantity A Higher Than Expected
Powertrain system Generic code P02xx codes Check engine light
What P027F means
P027F is the cold-start counterpart of P026D: during cold start the engine gets more fuel than commanded, for example from a leaking injector or an EGR valve or throttle in the wrong position that reduces fresh air. The check probably works as in warm running, from airflow and lambda against the commanded quantity. The code covers only phases with the cold-start emission strategy active (extra injections to heat the catalyst, raised idle): CARB requires faults of elements also monitored elsewhere to be reported separately during the cold-start strategy. No manufacturer using this code was found; the description follows CARB and the warm-running counterpart.
P027F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P027F
- Check engine light on
- White or black smoke after a cold start
- Rough running when cold
Common causes of P027F
- PossibleInjector leaking or worn
- PossibleEGR valve or intake/exhaust throttle in the wrong position (less fresh air)
- PossibleLambda/NOx sensor or airflow sensor reading wrong
- Less likelySoftware
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorsEGR valveNox sensor
What each part of P027F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2 | Area: fuel and air metering (injector circuit). |
| 7F | The exact fault in that area. |
What to do next
- Note P027F 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 P027F
What does P027F mean?
P027F means "Cold Start Fuel Injection Quantity A Higher Than Expected". P027F is the cold-start counterpart of P026D: during cold start the engine gets more fuel than commanded, for example from a leaking injector or an EGR valve or throttle in the wrong position that reduces fresh air. It is a generic code, so it means the same on every make.
Is it safe to drive with P027F?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P027F fail an emissions test?
Yes, it can. P027F 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 P027F to fix?
Difficulty: hard. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P027F 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.