Code Definition

P2189 — System Too Lean at Idle (Bank 2)

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

About P2189

P2189 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 P2189 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

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 P2189 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 oxygen sensor feedback and fuel trim for bank 2 during idle in closed loop. DTC P2189 is set when, at idle on bank 2, the ECM must apply excessive positive fuel trim beyond the calibrated limit to hold the commanded air fuel ratio, meaning it is adding fuel because the bank is lean. Because manifold vacuum is highest at idle, this code points strongly toward unmetered air entering the intake, although weak fuel delivery at idle can produce the same result. Symptoms include a rough or hunting idle, stalling, and hesitation just off idle, along with raise...

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