P059FActive Grille Air Shutter A Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The active grille shutter (A = upper or only shutter, B = second) closes louvres to cut drag and speed warm-up and opens them for cooling; CARB names it as an off-cycle CO2 technology and requires its components to be monitored. P059F compares commanded and reached position. GM checks it in two stages – detection, then five clearing attempts – type B, two trips; Ford's 3.0 L diesel at over 6° deviation in operation or 20° when learning fully open. 'Stuck off' means stuck closed at Toyota (failure type 73) and Nissan; GM and Ford use P059F for any deviation. Typical are ice, snow, debris or a bent bracket – a closed shutter can make the engine run hot in traffic.
- What you may notice
- Check engine light on
- Shutter not opening: engine temperature rises in traffic, fan running often
- Often after frost, gone after thawing
- Likely causes
- LikelyLouvres blocked by ice, snow or debris
- PossibleBent bracket or bumper part blocking the louvres
- PossibleActuator, gear or shaft faulty (shutter stays closed)
- PossibleLouvres unhooked or rubbing on horn or intake duct
- RareCalibration or software
- 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: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.