GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) Diesel Injector
Cross-Reference & Technical Specs
Authoritative technical specifications, verified Bosch part numbers, control valve stamping codes, nozzle spray orifices, and hold-down tightening torque for the GM 3.6L High Feature V6 SIDI diesel engine family.
All Verified Part Numbers for GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY)
The following 3 common-rail injector assemblies are calibrated for this engine family. Click any SKU to view individual test bench flow curves, sister cross-references, and vehicle applications.
Bosch 12636111 Common Rail Injector for GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) →
BOSCH CRIHigh-Response Multi-Hole Electromagnetic High-Pressure NozzleNozzle Code: See Product DetailBosch 12692510 Common Rail Injector for GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) →
BOSCH CRIIntegrated Pulse-Width Modulated Fuel Pressure ActuatorNozzle Code: See Product DetailBosch 12668635 Common Rail Injector for GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) →
BOSCH CRIHigh-Response Multi-Hole Electromagnetic High-Pressure NozzleNozzle Code: See Product Detail| Part Number (SKU) | Primary OE Reference | Control Valve | Nozzle Code |
|---|---|---|---|
| 261500029, 12668649, 12634126 | High-Response Multi-Hole Electromagnetic High-Pressure Nozzle | See Product Detail | |
| 12661029, 12677329, 12683984 | Integrated Pulse-Width Modulated Fuel Pressure Actuator | See Product Detail | |
| 12668636, 12684125, 12684126 | High-Response Multi-Hole Electromagnetic High-Pressure Nozzle | See Product Detail |
Verified Vehicle Compatibility
| Make / Manufacturer | Vehicle Model & Platform | Engine Specification | Model Years |
|---|---|---|---|
| Chevrolet | Camaro / Impala / Traverse | GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) | 2012-2020 |
| Cadillac | CTS / ATS / SRX | GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) | 2012-2016 |
| GMC | Acadia | GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) | 2012-2016 |
| Cadillac | XT5 / CT6 | GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) | 2016-2022 |
| Chevrolet | Camaro | GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) | 2016-2022 |
Installation, Tightening Torque & Re-torque Protocol
Strict torque compliance is mandatory on GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) common-rail cylinder heads. Over-torquing stretches the injector body or strips the head clamping threads, while under-torquing allows combustion blow-by past the copper sealing washer:
- Hold-down clamp bolt: 10 N·m (cold state). Always clean the cylinder head recess with an injector seat reamer.
- High-pressure rail flare nut: 25-30 N·m using a dedicated 17 mm line wrench.
- Return leak-off banjo bolt: 9-12 N·m with fresh copper washers on both sides of the banjo union.
After fitting replacement injectors on GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY), generate or program the cylinder-specific IMA calibration code into the engine ECU using an OEM-level scan tool (Bosch KTS, Renault CLIP, or VAG-COM) to prevent cylinder power imbalance and rough idle.
Technical Diagnostics FAQ for GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY)
What DTC fault codes indicate a failing injector on GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY)?
The most frequent fault codes are P0201 through P0204 (Injector Circuit Malfunction on Cylinders 1-4), P2146/P2149 (Injector Group Supply Voltage Error), and P0087 (Fuel Rail Pressure Low due to excessive internal leak-off). Measure solenoid coil resistance across the pins (0.5-1.5 Ω) and perform a graduated-bottle dynamic leak-back test to pinpoint the leaking cylinder.
Can sister SKUs within the GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) family be interchanged?
Not unless explicitly confirmed on the vehicle build plate. While sister SKUs share the same physical outer envelope and High-Response Multi-Hole Electromagnetic High-Pressure Nozzle control valve, they differ in nozzle spray orifice angle and factory IMA flow calibration. Mixing sister SKUs on the same engine block can trigger rough idle, elevated exhaust gas temperatures (EGT), and MOT emissions failure.
Which specific Bosch injectors fit the GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) engine?
The verified genuine Bosch common-rail injectors engineered for the GM 3.6L High Feature V6 SIDI (LFX / LLT / LGX / LFY) engine family are:
- Bosch 12636111 Common Rail Injector → (OE: 261500029, 12668649, 12634126, 217-3444, FJ1000, 0261500029) — Control Valve: High-Response Multi-Hole Electromagnetic High-Pressure Nozzle,
- Bosch 12692510 Common Rail Injector → (OE: 12661029, 12677329, 12683984, HM10041, HPP0026, GDP108) — Control Valve: Integrated Pulse-Width Modulated Fuel Pressure Actuator,
- Bosch 12668635 Common Rail Injector → (OE: 12668636, 12684125, 12684126, 217-3445, FJ1296) —