Powertrain, generic (extended)

P2426 EGR Cooling Valve Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2426 is set when the command wire of the cooling valve reads too low, which on most driver stages means the wire is shorted to ground or the output cannot pull up. In Ford's Power Stroke summary the low and high faults are detected together by a short-circuit check of the cooler bypass actuator that runs all the time and fails after 2 seconds. Volkswagen instead applies a fixed limit to the CNRB 3.0 TDI of the 2014 Touareg: below 2.97 V on the signal the code is stored. Chafed insulation against the exhaust or the engine block is the usual cause. The bypass flap then stays in its default position, which can make the warm-up longer or the EGR gas hotter.

Likely causes

Control wire chafed through and shorted to ground
Internal short in the valve actuator
Faulty output stage in the engine control module

Symptoms

  • Check engine light
  • Bypass flap no longer moves

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–500
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr cooling valve

Related codes

P2425P2427P245AP2457

References: fordservicecontent.com, static.nhtsa.gov, performanceparts.ford.com.