0261520135
BOSCH 0261520135 High Pressure Fuel Pump Buick Regal GS Envision Cadillac ATS CTS Chevrolet Camaro 2.0T LTG 12658478 GDP108
12658478, 12651170, 0261520136, GDP108, HM10028, HPP0018--200 barVehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| Cadillac ATS / ATS-L 2.0T | GM 2.0L Ecotec Turbo SIDI (LTG / LSY Tripower / LHU) | 2013-2019 |
| Buick Regal GS / Regal 2.0T | GM 2.0L Ecotec Turbo SIDI (LTG / LSY Tripower / LHU) | 2014-2020 |
| Buick Envision 28T AWD | GM 2.0L Ecotec Turbo SIDI (LTG / LSY Tripower / LHU) | 2015-2020 |
| Chevrolet Camaro 2.0T | GM 2.0L Ecotec Turbo SIDI (LTG / LSY Tripower / LHU) | 2016-2020 |
Technical Specifications
| Specification | Value |
|---|---|
| part_number | 0261520135 |
| oem_reference | 12658478 |
| manufacturer | BOSCH |
| system_type | High Pressure Fuel Pump |
| pressure_rating | 200 bar (2900 psi) |
| operating_temperature | -40°C to +135°C |
| flange_mount_torque | 15 N-m (11 lb-ft) |
| high_pressure_line_torque | 30 N-m (22 lb-ft) |
| diagnostic_dtc | P0087, P0089, P2293, P0300 |
| Operating PressureCore Spec |
Matched High-Pressure Fuel Injectors (Fuel Circuit Assembly)
Directly supplied by this high-pressure pump. Verify injector backleak balance if rail pressure fails to build during engine cranking.
Installation Tips
- Depressurize the fuel system completely via diagnostic scan tool or by removing the fuel pump fuse prior to line disassembly.
- Clean all surrounding bracket areas thoroughly using residue-free brake cleaner to prevent abrasive particulate ingress.
- Inspect the mechanical camshaft lobe and roller follower or clean injector bore seating surfaces before hardware alignment.
- Install component using fresh factory O-rings or Teflon combustion chamber seals lubricated only with clean motor oil.
- Torque mounting flange fasteners in alternating increments to 15 N-m (11 lb-ft).
- Torque high-pressure hydraulic tube fittings using a calibrated flare nut wrench to 30 N-m (22 lb-ft).
- Prime low-pressure fuel circuit, cycle ignition key 3-4 times, and inspect for high-pressure hydraulic leaks before road test.
- Always replace single-use high-pressure metal fuel lines and micro-filter seals whenever disconnected.
- Verify camshaft driving lobe surfaces for scoring or flat spots before installing any mechanical pump.
- Reset long-term and short-term fuel trim adaptations via OBD-II diagnostic scanner after physical replacement.
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.