P21D3Cylinder 5 Injector B Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P21D3 can only appear on engines with at least five cylinders and two injectors per cylinder. Documented users are Ford's dual-injection V6 and V8 engines (2.7 and 3.5 EcoBoost of the second generation, 5.0 V8 from 2018) and GM's supercharged LT5 V8. Ford defines B as the port injector; the direct injector of this cylinder is A, coded P0205. GM stores it as Type A once 20 of 25 samples fail. Ford's check is continuous above 11 V with a 5 s window. GM's LT5 injection module rates an open by the impedance seen with the driver off, 200 kOhm or more. On a V6 one bank then runs with a single weak cylinder, which fuel trims and misfire counters can reveal.
- What you may notice
- Check engine light on
- Misfire on cylinder 5 (P0305)
- Fuel trim of one bank shifted
- Likely causes
- LikelyOpen coil in the cylinder 5 port injector
- PossibleBroken wire in the bank harness of the port injectors
- 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: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.