What are the common causes of P2148?

A short to voltage in the fuel injector group A harness. High resistance in the group A injector harness. An open in the group A injector harness. A failed ECM injector driver. Corrosion at the ECM or injector connectors.

Read the group A injector supply voltage on a scan tool. Test the group A harness for a short to voltage. Measure resistance in the group A injector harness. Inspect the injector and ECM connectors for corrosion. Replace the ECM injector driver if the harness tests good. Clear the code and retest.

P2148

Fuel Injector Group A Supply Voltage Circuit High

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P2148 means Fuel Injector Group A Supply Voltage Circuit High.

Where it lives

For P2148, the injector sits on the circuit this code reports. The description of P2148 reports a fault at the injector.

Check these first

A short to voltage in the fuel injector group A harness
High resistance in the group A injector harness
An open in the group A injector harness
A failed ECM injector driver
Corrosion at the ECM or injector connectors

What to do next

Read the group A injector supply voltage on a scan tool
Test the group A harness for a short to voltage
Measure resistance in the group A injector harness
Inspect the injector and ECM connectors for corrosion
Replace the ECM injector driver if the harness tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.