P21E9Cylinder 7 Injector B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P21E9 indicates that the low side of the cylinder 7 B injector carries supply voltage. On GM's 2019 Corvette ZR1 LT5, the FICM declares this when it sees 0.5 Ohm or less to power with the driver off, provided the engine runs and the powertrain relay delivers 11 V or more; Type A, one trip. The rear left cylinder then gets only its direct injector. As the extra port fuel on this engine is meant for boosted operation, the effect may be limited to full throttle, where bank 1 can turn lean. CARB demands that output components be checked for circuit faults, yet leaves it to the maker whether shorts to power get their own code; GM separates them, while Ford folds every B-injector short into the open code (here P21D5). Low fault: P21E8; A injector high: P0280.
- What you may notice
- Check engine light on
- Bank 1 lean at full throttle
- Less power at full throttle
- Likely causes
- LikelyCylinder 7 B injector control wire shorted to battery voltage
- PossibleInjector coil with too low resistance
- RareInjection control module driver defective
- 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.