12662659 DEF Reductant Injector for GM Silverado Sierra 2500HD 3500HD 6.6L Duramax
Tax calculated at checkout · USD · Free 60-day returns
- AST-DEF-12662659-GM
Match the number printed on your old part or in the vehicle service manual — not the part name.
What this part is
Buy replacement 12662659 DEF Reductant Injector for GM Silverado Sierra 2500HD 3500HD 6.6L Duramax (OE 12662659). Verified fit for Chevrolet Silverado 2500HD / 3500HD, GMC Sierra 2500HD / 3500HD 6.6L Duramax LML / L5P & Colorado / Canyon 2.8L Duramax. 12-month warranty, 60-day returns, fast global dispatch. SKU: AST-DEF-12662659-GM.
12662659 DEF Reductant Injector for GM Silverado Sierra 2500HD 3500HD 6.6L Duramax. High-reliability aftermarket replacement component from AutoSensor Tech. Tested and calibrated to meet or exceed OEM specifications for SCR emissions reduction.
Fitment & Compatibility Guarantee
Direct plug-and-play fitment for: Chevrolet Silverado 2500HD / 3500HD, GMC Sierra 2500HD / 3500HD 6.6L Duramax LML / L5P & Colorado / Canyon 2.8L Duramax.
Interchangeable with OEM part numbers: 12662659, 12642310, 12683073, 12698944, 217-3444, 0444021043, 0444021044.
Technical Specifications
| Primary OE Part Number | 12662659 |
| System Platform | GM Duramax SCR Reductant System |
| Operating Voltage | 12V Pickup Diesel |
| Media Fluid | Diesel Exhaust Fluid (DEF) / AdBlue (ISO 22241) |
| Condition | Brand New OE-Quality Replacement |
| Warranty | 12 Months Replacement Warranty |
| Shipping | Fast Worldwide Dispatch (Air Express Available) |
Technical specifications
| Direct plug | and-play fitment for |
|---|---|
| ConditionBrand New OE | Quality Replacement |
| Month WarrantyHassle | free replacement guarantee |
Identification
| SKU | AST-DEF-12662659-GM |
|---|---|
| Part number | 12662659 |
| Brand | Dodge Ram |
| Category | DEF Doser Injector |
Verified fitment
| Brand / platform | Part number(s) |
|---|---|
| Chevrolet | 12662659 · AST-DEF-12662659-GM |
| Gmc | 12662659 · AST-DEF-12662659-GM |
| Dodge Ram | 12662659 · AST-DEF-12662659-GM |
12-month parts warranty
Every part ships with a 12-month warranty from the date of delivery. If the part fails under normal use within that window, we replace it or refund the purchase price — your choice.
What we cover
- Manufacturing defects — no questions asked.
- Early failure within the warranty period.
- Replacement shipping both ways, on us.
What we do not cover
- Damage from incorrect installation.
- Parts modified, disassembled, or used in racing.
- Cosmetic wear or normal ageing.
Shipping rates
| Destination | Carrier | Delivery | Cost |
|---|---|---|---|
| United States (cont.) | UPS / USPS | 2–4 biz days | Free $99+ · $6.90 |
| European Union | DHL / DPD | 3–6 biz days | Free $99+ · €8.90 |
| UK / Switzerland | DHL | 3–5 biz days | Free $99+ · £8.00 |
| Rest of world | DHL Express | 5–10 biz days | Calculated at checkout |
Returns
60-day no-fuss returns. Order a return label from your account, drop the part at any carrier drop-off, and we refund within 5 business days of receiving it. Wrong-fit returns are always free.
Returns policy
