P21EBCylinder 8 Injector B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P21EB is set when the cylinder 8 B injector circuit is shorted toward power. It closes GM's run of B-injector codes for the 2019 Corvette ZR1 LT5: the FICM sees the switched-off low side within 0.5 Ohm of supply in 20 of 25 samples and stores a Type A fault, lighting the MIL in the first trip. The supplemental injector of the right-rear cylinder can then no longer be opened, while the direct injector keeps working, so the car usually drives normally until high boost, where bank 2 may lean out. If several of these high codes appear together, a common feed or a shared connector is more likely than eight bad injectors. P21EA is the matching low fault, P0283 the A injector high fault and P0308 the misfire counter of this cylinder.
- What you may notice
- Check engine light on
- Lean bank 2 under boost
- Normal behaviour at part load
- Likely causes
- LikelyCylinder 8 B injector control wire shorted to a feed wire
- PossibleShared harness connector shorted when several injectors are affected
- PossibleInjector coil shorted
- RareInjection control module damaged
- 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.