OBD-II code · Powertrain (generic, extended)
P20E2 Reductant Pressure Too High
The reductant line pressure exceeds the upper limit. A blocked return path, a stuck pump or a faulty pressure sensor are common causes; over-pressure can damage the dosing valve and the pump head.
Is it safe to drive with P20E2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyReturn line blocked or frozen
- PossiblePressure sensor reads high
- PossibleDosing valve stuck closed
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Reductant Pump, Reductant Pressure Sensor, Reductant Lines
Related codes
- P20E1Reductant Pressure Too Low
- P20E9Reductant Pressure Too High
- P20DFExhaust Aftertreatment Fuel Pressure Sensor Circuit Low
- P20E0Reductant Pressure Too Low
- P20E3Exhaust Gas Temperature Sensor 1/3 Correlation (Bank 1)
- P20E4Exhaust Gas Temperature Sensor 2/3 Correlation (Bank 1)
- P20E5Exhaust Gas Temperature Sensor 1/2 Correlation (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.