P2426EGR Cooling Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine light
- Bypass flap no longer moves
- Likely causes
- LikelyControl wire chafed through and shorted to ground
- PossibleInternal short in the valve actuator
- RareFaulty output stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.