The Bosch 0445010052 is a high-pressure common rail diesel injection pump of the CP3S3 generation (type formula CR/CP3S3/R70-789S), specifically calibrated for Hyundai and Kia passenger vehicles equipped with the 2.5L D4CB CRDi diesel engine. The CP3 (radial piston pump) platform is widely recognized as one of the most durable and reliable high-pressure pump designs in the automotive industry, delivering stable rail pressure up to 1,600 bar with minimal pulsation.
At Rsolid Engine Parts, we supply this pump as a direct Bosch-compatible replacement, 100% calibration tested, with a 12-month warranty and competitive pricing for workshops and individual customers. Below you will find a comprehensive analysis of the pump‘s structural advantages, compatible vehicle applications, common failure modes with professional installation recommendations, and a technical data summary.
1. Structural Advantages of the Bosch 0445010052 CP3S3 Pump
The CP3 pump architecture, including the 0445010052 variant, offers several distinctive engineering benefits that set it apart from newer CP4 designs:
Three-Plunger Radial Piston Design – Unlike inline pumps or the two-plunger CP4, the CP3 uses three radial plungers arranged around an eccentric cam ring. This configuration delivers exceptionally smooth, high-volume fuel flow with minimal pressure ripple, reducing mechanical stress on the common rail, injectors, and high-pressure fuel lines.
Integrated Vane-Type Transfer Pump – A built-in low-pressure vane pump draws fuel directly from the tank and supplies the high-pressure plungers, eliminating the need for a separate external lift pump in most applications. This simplifies installation and reduces potential failure points in the fuel supply circuit.
Fuel-Lubricated High-Pressure Section – Unlike earlier unit pump systems that required engine oil lubrication, the CP3 uses the diesel fuel itself to lubricate the plungers and the eccentric cam. This design ensures consistent lubrication regardless of engine oil condition and simplifies installation.
Robust Cast Aluminum Housing – The pump body is manufactured from high-strength cast aluminum with precision-machined internal galleries and integrated damping chambers. The housing is treated with an anti-corrosion coating, making it resistant to moisture and chemical exposure.
Electronically Controlled Flow Control Valve (ZME) – The CP3S3 pump is equipped with a ZME inlet metering solenoid valve (Bosch reference 0928400713 / 1465ZS0082) that precisely regulates the amount of fuel entering the high-pressure plungers based on ECU demand. This provides accurate rail pressure control, improved fuel economy, and reduced emissions.
Backward-Compatible CP3S3 Generation – The S3 designation indicates a third-generation refinement of the CP3 platform, with improved internal seals, upgraded plunger coatings, and optimized hydraulic passages for quieter operation.
2. Compatible Vehicle Models (≤5)
The Bosch 0445010052 CP3S3 pump is specifically calibrated for the Hyundai-Kia D4CB 2.5L CRDi diesel engine. Compatible vehicles include:
Hyundai H-1 / Starex / i800 (2002–2015) – 2.5 CRDi 140 hp (103 kW) and 170 hp (125 kW) variants; engine code D4CB
Hyundai H-1 Grand Starex (2002–2015) – Same D4CB engine platform
Hyundai H100 Van / Porter (selected variants with 2.5 CRDi)
Kia Sorento 1 (JC) (2002–2011) – 2.5 CRDi 4WD 140 hp (103 kW); engine code D4CB
Hyundai Libero / Portex (selected Asian-market commercial models with the D4CB engine)
Note: Always verify the original Bosch number on your existing pump. The 0445010052 is typically stamped on the pump nameplate near the high-pressure outlet. Some later D4CB engines may use 0445010101 or 0445010354 – consult your engine code before ordering.
3. Common Failures & Professional Installation / Replacement Advice
3.1 Typical Symptoms of a Failing 0445010052 Pump:
Extended cranking time – The engine struggles to start, especially after sitting overnight, due to insufficient rail pressure buildup.
Loss of power under acceleration or load – The vehicle feels sluggish, particularly on inclines or when towing, often accompanied by black smoke from the exhaust.
DTC codes P0087, P0088, or P0191 – Common fault codes for fuel rail pressure too low, too high, or fuel pressure sensor rationality fault.
Noisy operation – Unusual whining, grinding, or clicking sounds from the pump area that change with engine RPM, typically indicating bearing or cam wear.
Fuel leakage – Visible diesel wetness around the pump body, particularly at the drive shaft seal or around the ZME valve mounting area.
Rough idle or engine surging – Inconsistent fuel delivery at low RPM, causing the engine to hunt or misfire.
3.2 Professional Installation & Replacement Recommendations:
Perform a complete fuel system diagnosis – Before replacing the pump, use a compatible diagnostic tool (e.g., Bosch KTS, Hyundai GDS, or generic OBD scanner with live data) to verify rail pressure values and identify any related faults in the system.
Replace all fuel filters – Install new OEM-quality primary (water separator) and secondary fuel filters. Old filters may introduce contamination that will destroy a new pump within minutes.
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 signs of degradation. CP3 pumps are more tolerant than CP4 units, but debris from a failed pump will still cause premature failure.
Inspect and flow-test injectors – Worn or stuck injectors with high return flow will prevent the pump from building correct rail pressure and can cause repeat pump failure. Have all four injectors professionally flow-tested and cleaned or replaced as necessary.
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. Never dry-crank the pump, as this will score the plungers and the eccentric cam.
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.
Torque all connections to specification – High-pressure outlet (M14×1.5 cone seal): 35–40 Nm. Low-pressure inlet and return: 25 Nm. Drive shaft nut: consult the vehicle workshop manual (typically 80–100 Nm for the D4CB engine).
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. On Hyundai/Kia D4CB engines, this procedure is typically found under “Diesel Fuel System” or “CRDi” in the diagnostic menu.
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 a diagnostic tool, verify that actual rail pressure tracks within ±20 bar of specified pressure across all RPM ranges.
4. Why Rsolid Engine Parts Is Your Trusted Supplier
Exact Bosch CP3S3 Compatibility – Direct replacement for the 0445010052 in all listed Hyundai and Kia D4CB applications, with no modifications or adapters required.
100% Calibration Tested – Each pump is run on a Bosch EPS 200 or equivalent test bench to verify delivery volume, rail pressure stability, ZME regulator response, and leak-free operation. Test reports are available upon request.
12-Month Warranty – Full coverage against manufacturing defects for all pumps supplied, even for high-mileage commercial applications.
Competitive Pricing for Workshops & Fleets – Volume discounts available for mechanics, garages, parts distributors, and fleet owners.
Fast Worldwide Shipping – Stock is held in multiple warehouses for rapid dispatch to Asia, Europe, Africa, the Americas, and the Middle East.
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 – For pricing, availability, or technical questions, please reach out directly:
📞 WhatsApp: +8615975376778
📧 Email: amy@rinjector.com
