P22E8Cylinder 4 Alternative Fuel Injector Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P22E8 applies when the cylinder 4 gas injector circuit is complete but the measured response lies outside the plausible range, for instance an opening current that rises too slowly or a hold phase that never settles. No vehicle maker documents P22E8 openly; the published lists from TransEco and Ford end at Low/High. Gas quality is a frequent background factor: GM fits a coalescing filter with a 6 micron element in its bi-fuel pickups because contaminants and liquids in the gas can damage the injectors, and the filter has to be drained and replaced at intervals. A neglected filter can therefore show up as this code. Cleaning rarely helps; the injector or the complete rail is usually replaced, then a drive on gas confirms the repair.
- What you may notice
- Malfunction indicator lamp on
- Rough idle on gas, smooth on gasoline
- Gas mode ends after a while
- Likely causes
- LikelyCylinder 4 injector fouled by oil or liquids, often from a neglected gas filter
- PossibleAged injector coil with changed resistance
- RareLow system voltage during cranking or at idle
- 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: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.