Urea Pump Assembly 5418889

BG 2039002 (OE 5418889): function on the vehicle

Urea Pump Assembly 5418889 is supplied by BEST GROWTH under part number 2039002, cross-referenced to OE 5418889, as a direct-fit aftermarket def pumps. In service it draws diesel exhaust fluid from the tank, builds and regulates system pressure, and returns fluid during the purge cycle. Filter condition, pressure stability and heater function drive service life.

BG 2039002 is built to the position defined by its OE application in truck and industrial engine service on the platform from Cummins. Position, calibration and connector layout are part of the specification, so a part that physically fits is not automatically the correct part.

DEF quality is the single largest driver of pump life. Fitting a new pump into a contaminated tank simply repeats the failure.

Fitment for Cummins and OE cross reference

BG 2039002 replaces 2 OE references: 5418889 and A060H209. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 2039002 includes Cummins, typically on Cummins. Coverage lists are a starting point for identification, not a substitute for checking the OE number on the vehicle.

Where several OE numbers appear against one BG reference, they are supersessions or regional variants of the same specification. Ordering by 5418889 and quoting the number on your part lets our technical team confirm the variant before despatch.

Symptoms that lead to replacing 5418889

These complaints bring a vehicle in with the Cummins def pumps under suspicion. None of them prove BG 2039002 has failed on its own, which is why the checks below matter before a replacement is ordered.

• long priming time after a tank refill
• frozen-line faults in cold-climate operation
• repeated dosing interruptions during a drive cycle
• pressure decay immediately after the pump stops
• pressure too low or unable to build pressure

Checks before fitting BG 2039002

Aftertreatment faults are usually system faults. Working through these checks prevents a repeat failure after the new def pumps is fitted.

• Check suction and pressure lines for kinks and crystallised blockage.
• Test pressure build-up time and decay against the manufacturer's limits.
• Inspect the DEF filter and tank strainer for contamination and crystallisation.
• Verify heater circuit and coolant valve operation before winter service.
• Confirm DEF concentration with a refractometer; contaminated fluid destroys the pump.

Quality, packaging and ordering 2039002

BG 2039002 is manufactured and tested to aftermarket replacement standards, with electrical, leakage and functional testing carried out before packing. Bulk and retail packaging, private-label cartons and customer-specific labelling are available for distributors and workshop groups.

Send OE 5418889 or the number printed on your part, the engine code and the vehicle identification number with your enquiry, and our technical team will confirm the correct reference, current stock position and lead time before you commit to an order.

Frequently asked questions

Does BG 2039002 replace OE 5418889?

Yes. BG 2039002 is listed against 5418889 and A060H209. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 2039002 fit?

Recorded coverage includes Cummins. It is supplied as a direct-fit aftermarket def pumps. Adaptation, reset or relearn procedures required by the vehicle manufacturer still apply after installation.

Does this fault code always mean the def pumps has failed?

No. Exhaust leaks, wiring and connector damage, reductant quality, dosing performance and upstream engine faults can all produce the same codes. Validate those inputs before replacing BG 2039002.