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.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P20E800Reductant pressure too lowManufacturer communications
3Original wording in English
AUDI
Reported code forms P20E800
This bulletin provides information for a hardware and software update for TDI clean diesel vehicles with DTC P20E800.
AUDI
Reported code forms P20E800
Supersedes Technical Service Bulletin Group 01 number 15-25 dated June 19, 2015. The MIL is on. DTC P20E800 (Reductant pressure too low) is stored in the engine control module. No relevant component or electrical…
AUDI
Reported code forms P20E800
The MIL is on. DTC P20E800 is stored in the ECM. No relevant component or electrical problems are found when Guided Fault Finding (GFF) is run on the stored fault codes. Software update is needed.
Check vehicle applicability
1A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | Q5 | 2015 |
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.
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.