Code Definition

P1228 — Injector circuit cylinder 3 intermittent

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: GM

About P1228

P1228 is a manufacturer-specific powertrain diagnostic trouble code recorded for GM vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1228 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1228 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The cylinder 3 fuel injector is supplied with battery voltage with the ignition on, and the Engine Control Module (ECM) switches the ground side of the circuit through an internal low side driver while watching the control line voltage to confirm the injector is doing what it was told. DTC P1228 is set when the ECM detects an intermittent fault on the cylinder 3 injector control circuit, meaning the circuit works normally for most of the time but momentarily opens, shorts or fails to switch before recovering. That intermittent character is what separates this code from a hard injector circuit ...

Join TaT to view the complete code information and diagnostic details.

Quick Facts