The Bosch CP4 family of high-pressure pumps is widely regarded as the benchmark for modern common rail diesel systems. The 0445010544 common rail fuel pump – fully compatible with Bosch CP4S1 architecture – is a direct OE replacement for a wide range of Hyundai and Kia vehicles fitted with the 2.0L D4HA or 2.2L D4HB CRDi diesel engines.
These R-series engines power a huge number of SUVs, sedans and people-movers across Europe, Asia, the Middle East and Africa. At the heart of their Bosch fuel system is the 0445010544 pump – a CP4S1 variant (Bosch type formula CR/CP4S1/R40/20) that delivers the precise, high-pressure fuel required for efficient combustion, strong performance and reliable cold starts.
Rsolid Engine Parts supplies the 0445010544 as a brand‑new, Bosch‑compatible unit – 100% calibration tested, delivered in genuine packaging, and backed by a full 12‑month warranty at highly competitive pricing.
1. Structural Advantages of the Bosch CP4S1 0445010544 Pump
The 0445010544 belongs to the Bosch CP4S1 series – an evolution of the earlier CP4 platform. It offers a number of engineering advantages specifically suited to modern 2.0L and 2.2L turbo‑diesel engines:
CP4S1 Two‑Plunger Radial Design – Two opposing plungers arranged radially around a precision‑ground eccentric cam deliver stable, high‑volume fuel flow with minimal pressure ripple. This results in lower stress on the common rail and injectors, promoting a longer service life.
Integrated Vane‑Type Transfer Pump – A built‑in low‑pressure vane pump draws fuel directly from the tank and feeds it to the high‑pressure plungers, eliminating the need for an external lift pump and simplifying installation.
High‑Pressure Capability (Up to 2,700 bar) – The CP4S1 pump is engineered to operate at pressures of up to 1,800 bar in the D4HB/D4HA application, with the Bosch CP4 platform capable of reaching as high as 2,700 bar in other configurations. This ensures exceptional fuel atomisation, cleaner combustion, and improved fuel economy.
High‑Pressure Fuel Lubrication – All internal moving parts (plungers, roller shoes, eccentric cam) are lubricated solely by diesel fuel, removing the need for external oil lines and guaranteeing consistent lubrication even under high load.
Integrated Digital Flow Control Valve (ZME) – An inlet metering solenoid valve precisely regulates the fuel volume that enters the high‑pressure section in accordance with ECU demand, delivering accurate rail pressure control, improved throttle response and lower fuel consumption.
Robust Cast Housing with Anti‑Corrosion Coating – The pump housing is manufactured from high‑strength materials with a protective surface treatment, designed to withstand vibration, temperature cycling and the environmental exposure typical of daily driving.
Direct Bosch CP4S1 Compatibility – Identical mounting flange (3‑bolt SAE pattern), drive gear interface, high‑pressure outlet ports, and electrical connector as the original Bosch 0445010544. True plug‑and‑play replacement with no modifications.
Genuine OEM Cross‑References – The 0445010544 is also known under numbers 0445010511, 0986437431 and 33100‑2F000, making it easy to verify fitment against your original part.
2. Compatible Engine & Vehicle Models (≤5)
The 0445010544 pump is specifically calibrated for the Hyundai‑Kia R‑series diesel engine family, which includes the 2.0L D4HA and 2.2L D4HB common rail turbo‑diesel engines. These engines feature a 16‑valve DOHC cylinder head, a Bosch CP4 common rail system operating at 1,800 bar, and piezo injectors.
Key vehicle applications include:
Hyundai Santa Fe (CM, DM, TM) – 2.2 CRDi, 197 hp, D4HB engine (2009–2020)
Hyundai Grand Santa Fe (NC) – 2.2 CRDi, D4HB engine (2013–2019)
Hyundai Grandeur / Azera (HG, IG) – 2.2 CRDi, D4HB engine (2011–2018)
Kia Sorento (XM, UM) – 2.2 CRDi, 197 hp, D4HB engine (2009–2020)
Kia Carnival (VQ, YP) – 2.2 CRDi, D4HB engine (2010–2021)
Hyundai Palisade (LX2) – 2.2 CRDi, D4HB engine (2019–present)
The pump is also compatible with other Hyundai and Kia models fitted with the R‑series diesel engine, including the Hyundai Tucson (TL, TLE) with the 2.0L D4HA engine and the Kia Sportage with either the 2.0L D4HA or 2.2L D4HB engine.
✅ Important fitment note – Before ordering, always verify the Bosch number on your original pump (stamped on the pump nameplate) and confirm your engine code (D4HA for 2.0L or D4HB for 2.2L). Cross‑reference numbers include 0445010511, 0986437431 and 33100‑2F000.
3. Common Failures & Professional Installation/Replacement Advice
3.1 Typical Symptoms of a Failing CP4S1 0445010544 Pump
Loss of power under acceleration or load – The vehicle feels sluggish when overtaking, climbing hills, or when fully loaded, frequently accompanied by black exhaust smoke.
Extended cranking time before start – The engine struggles to start, especially after being parked overnight, due to insufficient rail pressure build‑up.
Engine surging or rough idle – Inconsistent fuel delivery at low RPM, causing the engine to hunt or misfire during stationary operation.
DTC codes P0087, P0088, or P0191 – “Fuel Rail Pressure Too Low”, “Too High”, or “Fuel Pressure Sensor Rationality”. These are classic indications of pump malfunction.
Metal particles in the fuel filter – A clear sign of CP4 internal wear (plunger scuffing or roller bearing failure). Even tiny ferromagnetic particles indicate imminent pump failure. The Bosch CP4 pump has a well‑known weakness: it releases fine metal particles from the internal cam and roller shoes when it begins to wear.
External fuel leakage – Visible diesel wetness around the pump body, particularly at the drive shaft seal or around the metering valve mounting area.
Whining or grinding noise from the pump area – A noise that changes with engine RPM, suggesting bearing or cam wear.
Diesel contamination in engine oil – A failed drive shaft seal allows fuel to enter the timing case and then the engine oil sump. Check for rising oil level and a diesel smell.
3.2 Professional Installation & Replacement Recommendations
Perform a complete fuel system diagnosis – Before replacing the pump, use a diagnostic tool (e.g., Bosch KTS, Hyundai GDS, or a generic scanner with live data) to verify rail pressure values, injector return flow rates, and identify any related faults.
Replace the fuel metering valve (ZME) – If the old pump has failed internally, it is strongly recommended to replace the ZME solenoid valve with a new one at the same time. A faulty ZME can cause repeat pump failure.
Replace all fuel filters – Install new OEM‑quality fuel filters (including the water separator) before running the new pump. The CP4S1 is highly sensitive to contamination, especially after a system failure.
Flush the entire fuel system – Drain and clean the fuel tank. Blow out all supply and return lines with compressed air. Replace any rubber hoses that show degradation. This step is non‑negotiable – debris from a failed CP4 pump will destroy a new unit within minutes.
Inspect and flow‑test all injectors – Worn or stuck injectors with high return flow will prevent the pump from building correct rail pressure and will cause repeat pump failure. The D4HB engine is fitted with sensitive piezo injectors that are particularly vulnerable to contamination. Have all injectors professionally tested and cleaned or replaced as necessary.
Replace the engine oil and filter – If diesel has contaminated the oil (rising level or diesel smell), change the oil and filter BEFORE running the new pump.
Prime the low‑pressure circuit – Before starting the engine, use a hand vacuum pump on the fuel return line to pull bubble‑free fuel through the pump and filters. CP4 pumps are extremely sensitive to aeration – never dry‑crank the pump.
Fill the pump with clean diesel – Remove the high‑pressure outlet fitting and pour clean, lubricious diesel (or Bosch special assembly lubricant) into the pump housing to prevent dry start scoring of the plungers and eccentric cam.
Torque all connections to specification – High‑pressure outlet (M14×1.5 cone seat): 35–40 Nm. Low‑pressure inlet and return: 25 Nm. Drive shaft nut: consult the vehicle workshop manual (typically 80–100 Nm for Hyundai/Kia R‑series engines). Use a calibrated torque wrench for all connections.
Reset fuel adaptations – After installation, use a diagnostic tool to clear learned fuel trim values and perform a “high‑pressure pump adaptation” or “fuel system learn” routine.
Perform a leak test – Idle the engine for 10 minutes, then inspect all high‑pressure and low‑pressure unions, the pump mounting area, and the drive shaft seal for any signs of fuel wetness.
Monitor rail pressure – Using live data on your diagnostic tool, verify that actual rail pressure tracks within ±20 bar of the specified value across all RPM ranges.
💡 Pro Tip – CP4 pumps are notoriously sensitive to water contamination and low‑quality diesel. Always drain the water separator regularly and use high‑quality diesel fuel with proper lubricity. Consider using a high‑quality fuel additive with lubricity enhancer, especially when running biodiesel blends. For high‑mileage vehicles, the installation of a “disaster prevention kit” (a secondary filtration system) can help contain damage in the event of a future pump failure.
4. Why Choose Rsolid Engine Parts as Your Supplier
✅ Exact Bosch CP4S1 Compatibility – Direct replacement for 0445010544 in all listed Hyundai and Kia D4HA/D4HB applications. No modifications required.
✅ 100% Calibration Tested – Each pump is run on a Bosch EPS 200 or equivalent test bench to verify delivery volume, rail pressure stability (1,800 bar capability), ZME regulator response, and leak‑free operation. Test reports are available on request.
✅ 12‑Month Warranty – Full coverage against manufacturing defects for all pumps supplied, even for high‑mileage vehicles.
✅ Competitive Pricing for Workshops & Dealers – Volume discounts available for mechanics, independent garages, parts distributors, and fleet operators.
✅ Fast Worldwide Shipping – Stock held in multiple warehouses for rapid dispatch to Asia, Europe, Africa, the Middle East, and the Americas.
✅ Expert Technical Support – Our diesel injection specialists provide pre‑purchase fitment verification, diagnostic assistance, and detailed installation guidance via WhatsApp or email.
Contact Rsolid Engine Parts Today
📞 WhatsApp: +8615975376778
📧 Email: amy@rinjector.com
