P21EACylinder 8 Injector B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P21EA is the ground-short code for the B injector of cylinder 8 and the last low code in GM's 2019 FICM table for the Corvette ZR1 LT5, because the V8 ends there. Cylinder 8 is the rearmost of the right bank (bank 2). The module flags 0.5 Ohm or less between the switched-off low side and ground in 20 of 25 samples of 100 ms, with the engine running and 11 V or more at the powertrain relay, as a Type A fault. Mitsubishi's four-cylinder dual-injection engine never reaches this code, and Ford treats a B-injector short on cylinder 8 as P21D6. A grounded low side can hold the injector open, so bank 2 runs rich and fuel can wash the cylinder wall. P21EB is the high fault; the A injector low fault is P0282.
- What you may notice
- Check engine light on
- Rich running on bank 2
- Hard hot start or misfire on cylinder 8
- Likely causes
- LikelyCylinder 8 B injector wiring chafed through to ground
- PossibleWater or corrosion in the cylinder 8 injector plug
- PossibleInjector shorted to its body
- RareFICM driver stuck on
- 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.