P202DReductant Leakage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P202D reports that DEF is escaping somewhere between pump and dosing valve, which the controller typically notices as a pressure that cannot be held. Volvo and Mack use it on their 2014 and later trucks (OBD13 onwards). A 2015 tech tip handles it together with P208E and P20E8 and names poor electrical contact, which makes the pressure reading look low, and contamination that really lowers it. 2023 bulletins CBR-2298 and CBR-2303 add crystal crusts, a clogged tip or a weeping dosing valve, yet stress that returned valves were mostly fine: the valve is replaced only if a dosing test shows reduced flow. White urea crust on lines or the valve is a typical sign. CARB requires reductant delivery to be monitored. Neglected, the system cannot hold pressure, NOx rises and inducement follows.
- What you may notice
- Malfunction indicator lamp on
- White crystalline deposits on DEF lines or dosing valve
- Higher DEF consumption, later inducement warnings
- Likely causes
- LikelyDosing valve weeping or crusted with crystals
- PossibleLeaking DEF line, fitting or seal
- PossiblePoor electrical contact faking a pressure loss
- RareContaminated DEF lowering system pressure
- 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: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.