BMW 12315B65855 RP Starter Generator - OE Replacement for BMW Hybrid/Electric Vehicles

BMW 12315B65855 RP Starter Generator - OE Replacement for BMW Hybrid/Electric Vehicles

12315B65855 RP Starter Generator | Direct Fit for BMW Hybrid Systems

Introduction

We supply the BMW 12315B65855 RP Starter Generator—a premium OE replacement part engineered to match BMW’s original specifications for hybrid and electric vehicle powertrains. As a core component of the mild hybrid/electric system, it integrates starter and generator functions, supporting engine startup, energy recovery, and power supply to vehicle electrical systems.

Compatible BMW Models

This 12315B65855 RP starter generator fits:

BMW 3 Series (G20/G21) 330e, 340i (2019-2024)
BMW 5 Series (G30/G31) 530e, 540i (2020-2024)
BMW X3 (G01) xDrive30e (2020-2024)
BMW X5 (G05) xDrive45e (2021-2024)
BMW 7 Series (G11/G12) 745e (2019-2023)

Key Features

OE Exact Fit: Precision-manufactured to match BMW part number 12315B65855, direct replacement with no modification—plug-and-play compatibility with original vehicle systems.
Dual-Function Integration: Combines starter (quick engine ignition) and generator (energy recovery during deceleration) functions, optimizing hybrid system efficiency.
High-Durability Construction: Premium copper windings, heat-resistant insulation materials, and corrosion-resistant housing, ensuring stable performance under high-temperature and high-load conditions.
Optimal Electrical Performance: Stable voltage output (12V/48V, matching vehicle specs), low energy consumption, and fast response to powertrain control signals.

Customer Benefits

12-Month Quality Warranty: Free replacement or full refund for manufacturing defects (non-human damage).
Fast Global Shipping: 3-7 business days delivery via DHL/EMS, fully trackable with real-time logistics updates.
Wholesale Discounts: Competitive pricing for repair shops, BMW specialty dealers, and auto parts distributors (flexible MOQ).
Professional Technical Support: Free fitment verification, installation guidance, and hybrid system troubleshooting from certified auto electricians.

Common signs of a faulty RP starter generator: difficulty starting the engine, warning lights for hybrid system malfunction, reduced fuel efficiency (for hybrids), abnormal noise during startup, or electrical system failures (dim lights, weak power supply). This 12315B65855 replacement restores the full performance of BMW’s hybrid/electric powertrain.

BMW 12315B65855 RP Starter Generator Installation & Maintena

Installation Preparation
- Disconnect the negative battery terminal and high-voltage hybrid battery (follow BMW’s official safety procedures for high-voltage systems—professional installation recommended).
- Lift the vehicle if needed (secure with jack stands) to access the starter generator (typically mounted on the engine block).
- Gather tools: socket wrench set, torque wrench, insulated tools (for high-voltage connections), and BMW diagnostic scanner (to reset system codes after installation).
- Wear protective gear: insulated gloves, safety glasses, and anti-static clothing.
Step-by-Step Installation
- Remove engine covers, air intake components, or accessory belts to access the 12315B65855 RP starter generator.
- Disconnect electrical connectors (mark them for correct reinstallation) and high-voltage wiring harness (ensure no voltage is present before disconnecting).
- Remove mounting bolts securing the starter generator to the engine block.
- Extract the old unit and clean the mounting surface (remove dust, oil, and debris to ensure a tight fit).
- Install the new 12315B65855 starter generator, tighten mounting bolts to BMW’s recommended torque (35-40 N·m).
- Reconnect electrical connectors and high-voltage wiring harness (ensure secure locking to avoid loose connections).
- Reinstall engine covers, air intake components, and accessory belts.
- Reconnect the battery, use a BMW diagnostic scanner to reset fault codes, and perform a system test.
Maintenance Tips
- Inspect the starter generator every 40,000 km: check wiring harness for damage, connectors for corrosion, and mounting bolts for tightness.
- Keep the unit clean: avoid oil leakage onto the starter generator (oil can damage insulation and cause short circuits).
- Follow BMW’s hybrid system maintenance schedule: replace cooling fluid for the hybrid system (if applicable) to prevent overheating of the starter generator.
- If the hybrid system warning light illuminates, stop driving immediately and have the starter generator inspected by a professional to avoid further powertrain damage.