P21E2Cylinder 4 Injector B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Misfire on cylinder 4 (P0304)
- Noticeably less power with several codes (port injection only)
- Likely causes
- LikelyCylinder 4 injector wire open or shorted to ground
- PossibleIntermediate connector fault affecting several cylinders
- PossibleCylinder 4 injector coil defective
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.