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DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P054F

P054FIdle Control System Fuel Quantity Higher Than Expected

P054F indicates that the engine control module (ECM) has detected the idle control system is delivering more fuel than expected while the engine is idling. The ECM monitors idle stability and fuel trim; when the fuel quantity required to maintain the target idle speed exceeds a calibrated threshold, it stores this code.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough or unstable idle, sometimes accompanied by shaking or vibration
  • Engine may stall when coming to a stop or while idling
  • Hesitation or stumble when accelerating from idle
  • Increased fuel consumption noticed over time
  • Occasionally, a sulfur or fuel odor from the exhaust

Common causes, most likely first

  1. Vacuum leaks from cracked or disconnected intake hoses, intake manifold gaskets, or vacuum lines
  2. Dirty or faulty electronic throttle body (ETB) causing incorrect airflow at idle
  3. Malfunctioning idle air control (IAC) valve, if equipped, stuck open or leaking
  4. Leaking fuel injectors allowing excess fuel into the cylinders
  5. Faulty mass airflow (MAF) sensor reporting incorrect air quantity
  6. Contaminated or faulty manifold absolute pressure (MAP) sensor
  7. Worn or misadjusted throttle plate or throttle linkage

How to diagnose and fix it

  1. Inspect all intake and vacuum hoses for cracks, loose connections, or missing clamps and repair as needed
  2. Clean the throttle body and idle air control passages with approved cleaner, then perform a throttle relearn procedure
  3. Check fuel injectors for leaks using a fuel pressure gauge and injector balance test; replace faulty injectors
  4. Test the mass airflow sensor with a scan tool to compare actual airflow to expected values; clean or replace if out of specification
  5. Verify manifold absolute pressure sensor operation by comparing its reading to a known good vacuum gauge
  6. Perform a smoke test to locate hidden vacuum leaks in the intake system
  7. If all mechanical and sensor checks pass, update the ECM software if a technical service bulletin applies, or replace the ECM as a last resort

Idle Fuel Quantity Exceeded: Hidden Causes

  • A dirty throttle body is the most common cause of this code on drive-by-wire vehicles, and cleaning it often resolves the issue without parts replacement.
  • Small vacuum leaks that are invisible to the eye can cause the ECM to add fuel at idle, so a smoke test is more reliable than a visual inspection.
  • Leaking fuel injectors may not trigger misfire codes but can still cause rich idle conditions that set P054F.
  • The code can be set by a faulty engine coolant temperature (ECT) sensor that reports a cold engine when it is actually warm, causing excess fuel enrichment.
  • After repairs, the ECM may require a idle relearn procedure or a drive cycle before the code clears and stays off.

Can I keep driving with P054F?

You can usually drive the vehicle with this code, but avoid prolonged idling and be alert for stalling that could affect safety. Have the fault diagnosed soon to prevent potential catalytic converter damage from running rich.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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