SCR system and AdBlue
P2047, P208A/P208B and P20E8/P20E9: AdBlue pressure
These codes concern the supply and dosing path, but describe different assessments: the injection-valve circuit, pump control and reductant pressure.
At a glance
What the codes tell you
- P2047
- Reductant injection valve—circuit/open (bank 1, unit 1).
- P208A
- Reductant pump A—control circuit/open.
- P208B
- Reductant pump A—control circuit range/performance.
- P20E8
- Reductant pressure too low.
- P20E9
- Reductant pressure too high.
How the entries differ
- P2047 concerns the reductant injection-valve circuit for the specified bank and unit.
- P208A and P208B concern pump A’s control circuit and operating range respectively.
- P20E8 and P20E9 distinguish reductant pressure assessed as too low from pressure assessed as too high.
What is not yet established
- A pressure code does not prove that the pump needs replacing.
- Electrical control, pipework condition, pressure measurement and the dosing path must be checked as a connected system.
- The code describes the control unit’s assessment. It determines neither which component needs replacing nor the repair required.
- Manufacturer-specific descriptions, status, freeze-frame data and live readings can materially change the interpretation.
Diagnostic information that helps next
A reliable assessment does not consider the code in isolation. The following information turns a number into a fault condition that can be investigated:
- Requested and actual pressure, and pressure build-up time when the fault occurred
- Pump command, current draw and supply voltage
- Pipework, visible deposits and dosing-path leak tightness
- Dosing-valve status and other SCR codes stored at the same time
More codes for this system
Frequently asked questions about P2047, P208A, P208B, P20E8, P20E9
What do fault codes P2047, P208A, P208B, P20E8, P20E9 mean?
P2047: Reductant injection valve—circuit/open (bank 1, unit 1). P208A: Reductant pump A—control circuit/open. P208B: Reductant pump A—control circuit range/performance. P20E8: Reductant pressure too low. P20E9: Reductant pressure too high.
Which component needs replacing for P2047?
The code does not determine that. The full diagnostic description, fault status, freeze-frame data, live readings and vehicle-specific system checks determine the appropriate repair.
What information helps with diagnosis?
Useful information includes Requested and actual pressure, and pressure build-up time when the fault occurred, Pump command, current draw and supply voltage, Pipework, visible deposits and dosing-path leak tightness, Dosing-valve status and other SCR codes stored at the same time.
Traceable sources
Sources and scope
The descriptions are our own factual explanations of standardised generic OBD definitions. Manufacturer-specific P1xxx codes and differing manufacturer descriptions are not given blanket interpretations here.