P21E6Cylinder 6 Injector B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P21E6 reports that the B injector circuit of cylinder 6 has found a path to ground. In GM's 2019 tables for the Corvette ZR1 LT5, cylinder 6 is the third position on the right bank, which GM counts as bank 2. The FICM samples the switched-off low side every 100 ms and needs 20 bad readings out of 25, so a solid fault is confirmed within about two and a half seconds; the limit is 0.5 Ohm or less toward ground, Type A. A ground on the low side completes the injector circuit whenever its feed is live, so fuel can enter cylinder 6 without a command. Typical traces are a rich bank 2, fuel-wetted spark plug on that cylinder and fuel trims at their lean limit. P21E7 is the high fault of the same injector, P0276 the low fault of the A injector.
- What you may notice
- Check engine light on
- Rich condition on bank 2, possibly fuel smell
- Fouled spark plug or misfire on cylinder 6
- Likely causes
- LikelyCylinder 6 B injector harness chafed against engine metal
- PossibleInternal short to ground inside the injector
- RareInjection control module output stuck low
- 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.