Code Definition

P2189 — System Too Lean at Idle (Bank 2)

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

About P2189

P2189 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Hyundai 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 air fuel mixture control at idle using oxygen sensor feedback and fuel trim calculations for each cylinder bank. DTC P2189 is set when, at idle speed, the ECM determines that the long term and short term fuel trims for Bank 2 have exceeded the calibrated enrichment threshold, indicating that additional fuel is required to maintain the commanded air fuel ratio on that bank. The fault is evaluated only at idle and indicates unmetered air or insufficient fuel affecting Bank 2, the cylinder bank that does not contain cylinder number one. Symptoms commonly i...

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