Code Definition

P2187 — System Too Lean at Idle (Bank 1)

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

About P2187

P2187 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 P2187 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 P2187 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. DTC P2187 is set when, at idle speed, the ECM determines that the combined long term and short term fuel trims have exceeded the calibrated enrichment limit in the positive direction, indicating that additional fuel is required to hold the target air fuel ratio on Bank 1. Because the condition is only evaluated at idle, it usually reflects unmetered air entering the engine or insufficient fuel delivery that the higher airflow at cruise masks. Drivers may notice a r...

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