P21DECylinder 2 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
- P21DE is the low fault of the cylinder 2 B injector circuit. In Mitsubishi's 2022 Eclipse Cross manual, B means the direct injector; the code covers both a break and a grounded wire on the two DI lines of cylinder 2, held for 2 s at 10 to 16.5 V, while the port injector of the same cylinder reports P0264. Diagnosis starts with the coil resistance at the intermediate connector, which should be 1.74 to 2.04 Ohm at 20 °C. On GM's 2019 LT5 V8 cylinder 2 is the front cylinder of the right bank; there a low side shorted to ground on the supplemental injector, below 0.5 Ohm, sets a Type A fault from its separate module. GM runs this check while the driver is switched off; a grounded low side can energise the injector without a command. P21DF is the high fault, P21D0 the open.
- What you may notice
- Check engine light on
- Misfire on cylinder 2 (P0302)
- Possible fuel smell or rich running if an injector stays open
- Likely causes
- LikelyInjector line of cylinder 2 touching ground
- PossibleInjector coil resistance outside specification
- PossibleFault at the intermediate connector of the injector harness
- 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.