P22DDCylinder 2 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
- P22DD signals an interruption in the circuit of the cylinder 2 gas injector. On many systems that circuit is not driven by the engine computer: Ford's 2003 bi-fuel CNG trucks used a separate alternative fuel control module holding drivers for both injector sets, with heavier stages for the gas injectors because they draw more current. GM's 2014 bi-fuel Silverado likewise stores gas faults in its own CNG control module (bulletin PIP5181), so a scan tool has to read that module as well. No maker documents P22DD publicly; TransEco and Ford list only the cylinder 2 Low/High codes P22DE and P22DF, and TransEco assigns an open line to Low. Look for a burnt coil or a separated connector before blaming the module.
- What you may notice
- Malfunction indicator lamp on
- Gas mode not available or ends shortly after switching
- Misfire on cylinder 2 when running on gas
- Likely causes
- LikelyBurnt-out or open coil in the cylinder 2 gas injector
- PossibleConnector at the cylinder 2 injector loose or pulled off
- PossibleWire break between gas control module and injector
- RareFailed injector driver in the separate gas 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.