P22D9Cylinder 1 Alternative Fuel Injector Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P22D9 reports a broken control circuit at the gas injector of cylinder 1, the solenoid that meters CNG or LPG into the intake port whenever a bi-fuel or dedicated gas engine runs on the alternative fuel. The driver stage notices the break because no current flows when it switches on, or because the expected off-state voltage on its pin is missing. No maker publishes P22D9 itself: the TransEco AFCM list and Ford's 2014 code list only carry the Low/High pair P22DA/P22DB, and TransEco even files an open line under Low. GM's bi-fuel Silverado moves the injectors over to gas one by one starting with cylinder 1, so a break here tends to show up right at the changeover. Bi-fuel cars usually return to gasoline; a dedicated gas engine loses cylinder 1.
- What you may notice
- Malfunction indicator lamp on
- Engine changes back to gasoline or refuses to switch to gas
- Misfire on cylinder 1 in gas mode (dedicated engines)
- Likely causes
- LikelyOpen solenoid winding in the cylinder 1 gas injector
- PossibleLoose, corroded or unplugged connector at the gas injector
- PossibleBroken wire or failed splice in the gas system harness
- RareDefective driver stage in the gas or engine control module
- 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: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.