Code Definition

P2148 — Injector High Control Circuit Group 1 High Voltage

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Holden

About P2148

P2148 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2148 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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.

Because P2148 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Engine Control Module (ECM) controls the high side feed that supplies battery voltage to the group 1 fuel injectors and monitors that circuit for correct operation. DTC P2148 is set when the ECM detects voltage on the group 1 injector high control circuit that remains above the calibrated limit while the circuit is commanded off, which means power is reaching the injectors when it should not. The usual cause is a short to battery voltage on the circuit, an injector with an internal short to voltage, or a fault in the ECM high side driver. Because the affected injectors can be powered uncon...

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