AdBlue tank Berlingo Partner 1.6

Error Codes:
P20E0 - AdBlue pressure circuit too low
P20E8 - AdBlue pressure too low
U029E - Lost communication with Nox sensor B

The AdBlue tank with OE code 9818531680 is a complete module of the SCR (Selective Catalytic Reduction) system used on PSA vehicles with BlueHDi Euro 6 engines (B9 platform and derivatives). It integrates a container, urea pump, sensors, and electronic management of the module, ensuring storage, pressurization, and delivery of the fluid to the SCR injector.

Technical features

• Plastic material tank (HDPE) with pump + electronics module integrated (unit “tank + pump + control module”).
• Equipment: urea pump, level sensor, fluid temperature sensor, integrated filter, heating/antifreeze for the pickup and delivery line.
• Interface: 12 V electrical connector, heated delivery line to the SCR injector, quick-release fittings with seal.
• Typical capacity: ≈15–17 liters depending on year/platform and configuration (with/without spare wheel).
• Placement: rear underbody (longitudinal beam area/spare wheel compartment), protected against shocks and splashes.
• Supply: complete assembly, requires initialization in the engine ECU after installation (Denox/priming procedure).

DIPA can intervene to also review this important component for the correct functioning of the engine.

Functions

• Storage and pressurization of AdBlue fluid to feed the SCR circuit.
• Flow/pressure control and pump actuation management for stable dosing.
• Thermal conditioning (antifreeze/defrost) to ensure delivery in cold climates.
• OBD monitoring of level and temperature, with management of autonomy/filling alerts and fallback strategies.
• Integration with engine ECU and Nox sensors for closed-loop dosing and NOx reduction in the SCR catalyst.

Model applications

Citroen

• Berlingo (Multispace, flat platform, pickup)

Peugeot

• Partner (pickup, flat platform, Tepee)

DIPA recommends always verifying the compatibility of the spare part before purchase.

Typical faults

• Low urea circuit pressure due to pump failure, air aspiration, or clogged filter → AdBlue/engine warning lights, startup countdown.
• Tank level sensor failure → incorrect autonomy, persistent alerts after refilling.
• Fluid crystallization in pipes/injector → restrictions and flow reduction.
• Heating anomaly (resistances/heated lines) → delivery block at low temperatures.
• Leaks/weeping from the module or fittings → odors, crystalline deposits, connector corrosion.
• Wiring/electronic faults in the module → “range/performance” errors, degraded mode.

Error codes

• P20E8 – Low pressure reducer (low pressure urea circuit).

Final conclusions

The AdBlue OE 9818531680 tank is a complete assembly combining container, pump, sensors, and electrical management for the SCR system of BlueHDi Euro 6 Berlingo/Partner. During diagnosis/replacement, it is recommended to: verify fluid quality and crystallizations, check sealing and supplies.

DIPA has a wide range of spare parts: from original to selected aftermarket components from the best manufacturers on the market. Not only that: it offers reconditioned components with performance equal to new, providing savings in replacement and contributing to environmental protection through circular economy. If the part you need is not available, don’t worry: DIPA can recondition your part “on demand,” restoring full functionality and safety in a short time.