Code Definition

P2149 — Supply Voltage for Fuel Injector Group B Open Circuit

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

About P2149

P2149 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2149 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 P2149 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) monitors the supply voltage circuit for fuel injector group B to confirm correct power delivery is available before commanding injector actuation. On modern engines fuel injectors are typically grouped into banks or pairs and fed from a common positive supply (often switched by a dedicated injector main relay or by an internal ECM driver) with the ground side switched by the ECM to fire each injector. DTC P2149 is set when the ECM detects an open circuit, loss of supply voltage, or voltage below the calibrated minimum threshold on the group B injector positive f...

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