P2426 moderate

Exhaust Gas Recirculation Cooling Valve Control Circuit Low

The P2426 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Cooling Valve Control Circuit Low. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$200 - $1000 (parts and labor)
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Common Symptoms

  • Check Engine Light illuminated
  • EGR cooler not functioning properly
  • Elevated exhaust temperatures
  • Reduced engine performance
  • Possible coolant loss through EGR cooler

Probable Causes (Ranked by Likelihood)

  • Short to ground in EGR cooler valve wiring Very High
  • Failed EGR cooler valve solenoid (shorted) High
  • Corroded connector causing low resistance Moderate
  • ECM driver circuit fault Low

Step-by-Step Diagnostic Procedure

  1. Measure EGR cooler valve solenoid resistance

  2. Check wiring for shorts to ground

  3. Inspect connector for corrosion or water damage

  4. Check EGR cooler for internal leaks (white smoke indicator)

  5. Verify ECM output to the valve with a test light

Frequently Asked Questions

Can I drive with code P2426?

Short distances only. Monitor coolant levels closely as EGR cooler issues on diesel engines can lead to coolant loss and overheating.

What causes P2426?

Usually a shorted EGR cooler valve or damaged wiring. On diesel trucks, check for EGR cooler leaks which are a common related failure.

Is P2426 expensive to fix?

Costs range from $200 to $1000. The valve itself is moderate but if the EGR cooler is also leaking, full cooler replacement adds significant cost.

Sources

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

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