What does code P22DB mean?

Q: What does code P22DB mean?

Cylinder 1 Alternative Fuel Injector Control Circuit High. P22DB indicates that the powertrain control module (PCM) has detected a high-voltage condition on the control circuit for cylinder 1's alternative fuel injector, which is used when the engine runs on fuels such as compressed natural gas or propane. The PCM commands the injector on by grounding the circuit, and it monitors the feedback voltage; a reading above the expected threshold triggers this code, often indicating an open circuit, a short to voltage, or a failed injector.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22DB

P22DBCylinder 1 Alternative Fuel Injector Control Circuit High

P22DB indicates that the powertrain control module (PCM) has detected a high-voltage condition on the control circuit for cylinder 1's alternative fuel injector, which is used when the engine runs on fuels such as compressed natural gas or propane. The PCM commands the injector on by grounding the circuit, and it monitors the feedback voltage; a reading above the expected threshold triggers this code, often indicating an open circuit, a short to voltage, or a failed injector.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.