P21E2 code meaning
Cylinder 4 Injector B Circuit Low
Powertrain system Generic code P21xx codes Check engine light
What P21E2 means
P21E2 is the low fault of the B injector on cylinder 4, the last cylinder of an inline four. It is the final direct injector low code in Mitsubishi's 2022 Eclipse Cross list, which uses B for the high-pressure injectors and sets it for an open or a short to ground lasting 2 s. If the engine has lost injectors on more than one cylinder, the control unit stops direct injection completely and limits torque, so a P21E2 stored together with other P21DB-series codes points to a shared cause such as the intermediate connector or the driver supply. The cylinder 4 port injector reports P0270 and P0271. GM's 2019 LT5 V8 uses P21E2 for the right-bank cylinder 4 supplemental injector, rating a low side under 0.5 Ohm to ground as Type A. P21E3 is the high fault.
P21E2 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P21E2
- Check engine light on
- Misfire on cylinder 4 (P0304)
- Noticeably less power with several codes (port injection only)
Common causes of P21E2
- Most likelyCylinder 4 injector wire open or shorted to ground
- PossibleIntermediate connector fault affecting several cylinders
- PossibleCylinder 4 injector coil 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 P21E2 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. |
| E2 | The exact fault in that area. |
What to do next
- Note P21E2 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 P21E2
What does P21E2 mean?
P21E2 means "Cylinder 4 Injector B Circuit Low". P21E2 is the low fault of the B injector on cylinder 4, the last cylinder of an inline four. It is a generic code, so it means the same on every make.
Is it safe to drive with P21E2?
Drive gently and only to a workshop. With P21E2 the car can go into limp mode (reduced power) to protect itself.
Will P21E2 fail an emissions test?
Yes, it can. P21E2 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 P21E2 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P21E2 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.