P2059Reductant Injection Air Pump Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The air that atomizes DEF in an air-assisted system comes either from a small dedicated compressor or from an existing compressed-air system through a supply valve. P2059 concerns the driver circuit of that pump or valve, above all an open circuit: the output is switched on but no current flows. Deutz uses the code on its EMR L1 controller for the air pump or air supply valve (SPN 5796) with several failure types: -00 open circuit, -19 critically high output current, -31 load shorted and -2A unspecified electrical fault, while P2060 and P2061 cover high-side shorts to ground and battery. A blown fuse, a broken coil, an unplugged valve or corroded pins are typical. Without atomizing air the controller cannot dose DEF and NOx rises.
- What you may notice
- Emission warning lamp on
- No DEF dosing, NOx rises
- Power derate on trucks and machines
- Likely causes
- LikelyOpen coil in the air valve or pump motor
- PossibleConnector unplugged or corroded, wire broken
- PossibleFuse or relay in the supply path failed
- RareShorted valve coil causing overcurrent shutdown
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.