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TuningBot DTC Database · v4.37.15

P20E9 Reductant Pressure Too High

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEmissionsOBD2

What P20E9 means

P20E9
Reductant Pressure Too High Generic · emissions Data confidence 78%

The control module detected that the Reductant Pressure value was above the expected limit.

Symptoms

  • MIL or SCR/AdBlue warning illuminated
  • Possible start-count-down or torque limitation on some applications

Possible causes

  • Reductant quality or level fault
  • Dosing valve or supply module fault
  • NOx sensor fault
  • Frozen or crystallized reductant lines
  • Wiring or connector fault

Recommended checks

  • Read NOx sensor values and dosing system status
  • Check reductant level and quality data
  • Inspect dosing valve, lines and heater operation
  • Check wiring and connectors of the SCR components
  • Check for OEM technical bulletins and software updates

Related and nearby codes

P20 range
P2000P2001P2002P2003P2004P2005P2006P2007P2008P2009P200AP200BP200CP200DP200EP200FP2010P2011

How to read P20E9

P

Powertrain: engine, transmission and driveline systems.

2

Generic SAE-standard code: same meaning on every make.

0E9

Specific fault index within the subsystem.

Frequently asked questions about P20E9

What does P20E9 mean?

Reductant Pressure Too High. The control module detected that the Reductant Pressure value was above the expected limit.

Is P20E9 generic or manufacturer-specific?

P20E9 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P20E9 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: SCR / AdBlue System

ECU tuningDyno-tested results by model and engine See the results →

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