Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P20E9Reductant Pressure Too High
P20E9-00Reductant Pressure Too High
P20E9-00Reductant Pressure Too High
Manufacturer communications
27Original wording in English
AUDI
This bulletin contains repair instructions for when a MIL is on and DTC P20E900 or P20FE00 is stored in the ECM.
AUDI
This bulletin contains repair instructions for when a MIL is on and DTC P20E900 or P20FE00 is stored in the ECM.
AUDI
This bulletin contains repair instructions for when a MIL is on and DTC P20E900 or P20FE00 is stored in the ECM.
JEEP
Flash: 3.0L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming Powertrain Control Module (PCM) with latest available software. It also involves cleaning or replacement of Exhaust Gas Temperature (EGT) Sensor 1/2 and/or Catalyst Temperature Sensor if necessary depending on Diagnostic Trouble Codes …
Check vehicle applicability
121A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.