Powertrain, generic (extended)

P21E2 Cylinder 4 Injector B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Cylinder 4 injector wire open or shorted to ground
Intermediate connector fault affecting several cylinders
Cylinder 4 injector coil defective

Symptoms

  • Check engine light on
  • Misfire on cylinder 4 (P0304)
  • Noticeably less power with several codes (port injection only)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–900
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injectorinjector wiringengine control module

Related codes

P21E3P21D2P0270P21E0P21E4P0304

References: mitsubishitechinfo.com, mitsubishitechinfo.com, gsi.ext.gm.com.