Code Definition

P1225 — Injector circuit cylinder 2 intermittent

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

About P1225

P1225 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 P1225 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.

P1225 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 2 fuel injector receives battery voltage whenever the ignition is on, and the Engine Control Module (ECM) completes the circuit by switching the ground side through an internal low side driver while monitoring the control line voltage to confirm the injector is responding correctly. DTC P1225 is set when the ECM detects an intermittent fault on the cylinder 2 injector control circuit, meaning the circuit behaves correctly most of the time but momentarily goes open, shorts, or fails to switch. That intermittent behaviour is the key to the code: a component that has failed outright ...

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