0445020236 BOSCH CP5 FUEL PUMP – DETROIT DD13 / DD15 / DD16

The 0445020236 is a Bosch CP5-series high-pressure common rail fuel pump, designed as the primary pressure-generation component for Detroit Diesel DD13, DD15, and DD16 heavy-duty engine platforms. This unit delivers the precise fuel volume and rail pressure required by the DDEC VI electronic control system to sustain combustion efficiency across the full operating range-from idle to maximum rated output. As a direct cross-reference for OEM numbers including A4700902150, 0986437507, RA4700900850, and 0445020235, this pump serves as both a service replacement and a core component for remanufacturing programs serving the African and Southeast Asian heavy equipment aftermarket.

The 0445020236 operates within the Bosch CP5 architecture, with maximum rail pressure ratings reaching 850 bar for DD13 applications and 900 bar for DD15 variants, according to Detroit Diesel service documentation . The internal plunger and barrel assemblies are machined to micron-level tolerances, enabling the pump to respond to ECM commands for fuel metering and timing adjustments in milliseconds. This precision is critical for maintaining injection pressures that peak at 2,000 bar on DD13 and 2,200 bar on DD15, ensuring complete fuel atomization and consistent power delivery . The pump's flow characteristics are calibrated to accommodate the displacement differences between platforms-12.8 liters for DD13 and 14.8 liters for DD15-without sacrificing pressure stability during load transitions . For remanufactured units, Bosch employs factory-spec test benches to verify delivery rates across the RPM band, restoring the component to "as-new" hydraulic performance with a standard 12-month warranty.

This fuel pump services the entire Detroit DD13 and DD15 engine family, with compatibility extending to DD16 installations where shared interchange numbers apply . The cross-reference matrix includes 0-445-020-235, 0-986-437-507, A4700900850, RA4700902150, and EA4700902150, confirming its role as a direct service replacement across model years from EPA07 through GHG14 emissions standards . Application covers Freightliner Cascadia, Western Star, and Thomas Built bus configurations, as well as vocational installations in refuse haulers, concrete mixers, and heavy tow vehicles operating in African mining and Southeast Asian construction sectors. The pump is also specified for export engine variants-model codes 471915S for Australian DD13 and 472907S for export DD15-widening its relevance for workshops servicing imported American heavy equipment in developing markets .

Proper installation of the 0445020236 requires strict compliance with Detroit Diesel service bulletin procedures, particularly regarding high-pressure fuel line reuse. Detroit specification DDC-SVC-MAN-0084 mandates that all high-pressure fuel rail feed lines from the pump to the rail be treated as single-use components; once removed, they must be replaced with new service kit parts to prevent leakage at operating pressures exceeding 2,000 bar . The mounting bracket bolts, P-clips, and vibration dampers are also one-time-use items, with specific service kits designated by fuel filter system configuration-three-filter systems use kit A0000700832 for DD13 and A0000701132 for DD15, while two-filter systems require A0000701032 and A0000700932 respectively . All fasteners must be torqued by hand tools only; power tools risk overtightening and thread damage that compromises the sealing integrity of the CP5's high-pressure circuit. The pump flange bolts themselves require precise torque application per OEM values, and the return lines P-clip bolt on two-filter systems is the sole reusable fastener in the entire high-pressure fuel delivery assembly .

For parts distributors and repair facilities serving fleets operating DD13 and DD15 powertrains, the remanufactured 0445020236 presents a compelling inventory strategy. Bosch-factory remanufactured units restore the pump to OEM specifications using genuine replacement wear components, including resized plunger and barrel sets, new seals, and recalibrated solenoid valves . The remanufacturing process includes dynamic flow testing to verify delivery across the full RPM range, with warranty coverage extending to 12 months (Bosch) or up to 24 months (aftermarket remanufacturers) . Compared to new OEM pump pricing-often exceeding $1,700 USD-remanufactured units offer a cost-reduction of 20–30% while maintaining equivalent reliability . For workshops in regions where core return logistics are complex, some suppliers offer no-core-charge programs, simplifying the procurement process and reducing inventory carrying costs . The service life of a properly maintained CP5 pump exceeds 500,000 miles, making remanufacturing a sustainable alternative to new-unit procurement for high-mileage fleet applications.

Q1: How do I verify the 0445020236 pump matches my DD15 engine's emissions standard?
Check your engine serial number (ESN) location on the left front cylinder block pad. Model codes 472903S through 472910S indicate EPA10 to GHG17 DD15 variants; the pump is compatible across all, but verify your existing pump's Bosch exchange number-look for 0986437507 or 0-986-437-507 stamped on the housing .

Q2: What is the core return policy for remanufactured units shipped to Africa or Southeast Asia?
Core return requirements vary by supplier. Some offer no-core-charge programs at a premium price point, while others require core return within 30–60 days for refund. Confirm with your supplier before ordering, as international core shipping costs can erode savings .

Q3: Can I install this pump without replacing the high-pressure fuel lines?
No. Per Detroit Diesel service bulletin 14 TS-19, all high-pressure feed lines from the pump to the rail must be replaced if removed-they are single-use components. The same applies to mounting bracket bolts, P-clips, and vibration dampers. Reusing these parts invites leakage and potential fuel system contamination .

Q4: What are the early warning signs of CP5 pump failure on a DD13?
Extended cranking on hot starts, rail pressure deviation codes (SPN 157 FMI 18), gradual power loss under load, and metal particles in the fuel filter element. If the pump suffers internal wear, the entire fuel system-injectors and rail-must be flushed before installing a replacement to prevent secondary damage.

Q5: Does this pump come with mounting gaskets and sealing washers?
Most remanufacturers ship the pump without gaskets, O-rings, or high-pressure line seals. These must be ordered separately as part of the appropriate service kit-A4710705935 for EPA07/10 DD13 or A4720707932 for EPA07/10 DD15-per the vehicle's fuel filter system configuration .

Q6: How does the CP5 pump on DD15 compare to earlier mechanical injection pumps?
The CP5 is electronically governed by the DDEC VI / DDEC 10 / DDEC 13 ECM, adjusting fuel delivery in microseconds based on load, altitude, and temperature inputs. Unlike mechanical pumps, it cannot be manually "tuned" or adjusted; any performance deviations must be diagnosed via diagnostic trouble codes and ECM parameters .

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