P21EE code meaning
Cylinder 10 Injector B Circuit Low
Powertrain system Generic code P21xx codes Check engine light
What P21EE means
P21EE is the low-circuit code for the B injector of cylinder 10, the last cylinder of a V10. In practice that points to a ten-cylinder engine with two injectors per cylinder, of which only Lamborghini's Huracán is documented: its V10 pairs a direct injector with a port injector at each cylinder and was presented as the first V10 to combine both. Lamborghini does not publish which set is B or whether it uses this code. With cylinders 1 to 5 on one bank and 6 to 10 on the other, cylinder 10 is on the second bank. A short to ground is the core fault; CARB lets a maker report a broken wire under the same code instead of a separate open code. Before replacing parts, read the open code P21D8 and the A injector low code P0288 as well. High fault: P21EF.
P21EE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P21EE
- Check engine light on
- Rough running or misfire on cylinder 10 (P0310)
- Fuel trim deviation on the second bank
Common causes of P21EE
- Most likelyCylinder 10 B injector wire grounded
- PossibleDamaged or corroded injector connector on cylinder 10
- PossibleInjector with internal ground fault
- Less likelyEngine control unit output defective
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorInjector wiringEngine control module
What each part of P21EE means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| EE | The exact fault in that area. |
What to do next
- Note P21EE 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 P21EE
What does P21EE mean?
P21EE means "Cylinder 10 Injector B Circuit Low". P21EE is the low-circuit code for the B injector of cylinder 10, the last cylinder of a V10. It is a generic code, so it means the same on every make.
Is it safe to drive with P21EE?
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 P21EE fail an emissions test?
Yes, it can. P21EE 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 P21EE to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P21EE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.