P230F code meaning
Cylinder 6 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
Powertrain system Generic code P23xx codes Check engine light
What P230F means
P230F is the balance-limit code for cylinder 6 and can only appear on engines with six or more cylinders, inline sixes, V6 units and larger. On a V6, cylinder 6 shares its bank and front oxygen sensor with two others, so its individual trim has to be estimated from that bank signal or from crankshaft speed. No maker documents P230F publicly, and no NHTSA bulletin mentions it. The series jumps from here to P231A for cylinder 7, because P2310 to P2319 are taken by ignition coil codes. Mercedes, which uses the series on its AMG M177 V8, shows that such a code can also be a software matter. Checks for cylinder 6 follow the usual order: injector delivery, intake sealing at that port, compression and valve tightness. P21A1 and P0306 belong to the same cylinder.
P230F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P230F
- Check engine light on
- Rough idle, possibly misfire on cylinder 6
- Higher fuel consumption or exhaust smell
Common causes of P230F
- Most likelyInjector of cylinder 6 delivering too much or too little (deposits, wear)
- PossibleAir leak at the intake port or injector seal of cylinder 6
- PossibleValve of cylinder 6 not sealing (worn seat or guide), low compression
- Less likelyPoor contact at the connector of injector 6
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injector cyl 6Intake manifoldCylinder compression
What each part of P230F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 0F | The exact fault in that area. |
What to do next
- Note P230F 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 P230F
What does P230F mean?
P230F means "Cylinder 6 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance". P230F is the balance-limit code for cylinder 6 and can only appear on engines with six or more cylinders, inline sixes, V6 units and larger. It is a generic code, so it means the same on every make.
Is it safe to drive with P230F?
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 P230F fail an emissions test?
Yes, it can. P230F 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 P230F to fix?
Difficulty: medium. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P230F 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.