P2486 moderate

Exhaust Gas Recirculation Cooler Efficiency Circuit Low

The P2486 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Cooler Efficiency Circuit Low. This is a moderate severity code.

My Garage →
Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$100 - $600 (parts and labor)
ANCEL AD310 OBD-II Scanner
Recommended Tool
ANCEL AD310 OBD-II Scanner

Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.

Check Price on Amazon
AstroAI Digital Multimeter
Every Tech Needs This
AstroAI Digital Multimeter

Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.

Check Price on Amazon

Affiliate links — we earn a commission at no extra cost to you.

Common Symptoms

  • Check Engine Light on
  • Possible reduced engine power
  • Failed emissions test
  • Engine management may use default values
  • Slight performance change

Probable Causes (Ranked by Likelihood)

  • Failed sensor or actuator in the affected system Very High
  • Wiring damage due to heat or vibration High
  • Carbon or soot contamination Moderate
  • ECM circuit fault Low

Frequently Asked Questions

What does P2486 mean?

P2486 indicates: Exhaust Gas Recirculation Cooler Efficiency Circuit Low. The ECM detected an issue that needs diagnosis and repair.

Is P2486 urgent?

This code should be addressed soon to maintain proper engine operation.

What should I check first?

Start with a visual inspection of the sensor wiring and connector. Use a scan tool to read live data. For DPF codes, check soot loading level. For EVAP codes, check the gas cap first.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

  1. Read relevant sensor data on scan tool

  2. Inspect wiring and connectors for damage

  3. Measure sensor or actuator resistance

  4. Compare readings to manufacturer specifications

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)

Commonly Affected Vehicles

  • 2011-2020 Ford F-250 6.7L Diesel
  • 2010-2019 Ram 2500 6.7L Diesel
  • 2012-2019 Chevrolet Silverado 2500 6.6L Diesel
  • 2013-2020 Ford F-150 3.5L EcoBoost

Related Codes

P2485P2487P0401

Explore More

Search codes Vehicle-specific fixes Guides By make

Was this helpful?

Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.

Browse by symptom → Read repair guides → Fixes by vehicle →