P21D0Cylinder 2 Injector B Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P21D0 is the open-circuit code for the B injector of cylinder 2. Where that cylinder sits varies: GM's small-block V8 alternates odd and even numbers between the banks, so cylinder 2 opens the right bank, while Ford's V6 and V8 count one bank first and place it next to cylinder 1. Ford defines B as the port injector, the direct injector being A with P0202. Ford runs the check in every engine with combined port and direct injection, from the three-cylinder 1.5 to the 5.0 V8, continuously at 11 V or more for 5 s. GM's LT5 injection module samples the circuit every 100 ms once the powertrain relay supplies at least 11 V. On engines that run on port fuel alone at light load, like Ford's second 3.5 EcoBoost, the cylinder then misfires mostly at idle. Low and high faults are P21DE and P21DF.
- What you may notice
- Check engine light on
- Misfire on cylinder 2, mainly at idle and light load
- Code P0302 stored as well
- Likely causes
- LikelyPort injector of cylinder 2 with an open winding
- PossibleBroken wire or pushed-back terminal in the injector harness
- RareOutput stage in the engine or injection module failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.