What does code P1228 mean?

Q: What does code P1228 mean?

Injector Circuit Cylinder 3 Intermittent. P1228 on a GM vehicle indicates that the engine control module (ECM) has detected an intermittent fault in the electrical circuit for cylinder 3's fuel injector. The ECM monitors injector current and voltage; when the signal momentarily drops out or spikes outside the expected range, it flags this code as a history or pending fault.

DTC codes / GM codes / P1228

P1228 · GMInjector Circuit Cylinder 3 Intermittent

P1228 on a GM vehicle indicates that the engine control module (ECM) has detected an intermittent fault in the electrical circuit for cylinder 3's fuel injector. The ECM monitors injector current and voltage; when the signal momentarily drops out or spikes outside the expected range, it flags this code as a history or pending fault.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

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