4-Pc GM LS Ignition Coil Set 12578224 12638824 12589623 12629646 | D585 UF-262

4-Piece D585 Ignition Coil Set

Package includes four identical aftermarket ignition coils. The following numbers refer to the same coil application and are provided for cross-reference purposes: 12578224, 12638824, 1208089, 1263115, 12589623, 12629646, D585, UF-262, and C1251. Verify the original coil number, connector, mounting style, vehicle year, and engine before ordering.

Important Fitment Information

The applications below are general references. Compatibility can vary by engine code, model year, connector, mounting bracket, and original coil design. Vehicle model and engine size alone do not confirm fitment. Compare the existing coil and OE number before ordering.

• 12578224 – GM OEM
• 12638824 – GM OEM (updated revision)
• 1208089 – ACDelco aftermarket cross-reference
• 1263115 – ACDelco aftermarket cross-reference
• 12589623 – GM OEM (early revision)
• 12629646 – GM OEM
• 0997000850 – Denso OEM cross-reference
• 0997001900 – Denso OEM cross-reference
• 0997001730 – Denso OEM cross-reference
• 61000102 – Delphi aftermarket cross-reference
• 4802236 – Delphi / Standard aftermarket cross-reference
• 4805094 – Delphi / Standard aftermarket cross-reference
• D585 – Standard Motor Products (most common aftermarket reference)
• UF-262 – Standard Motor Products Blue Streak cross-reference
• C1251 – Delphi aftermarket cross-reference

Vehicle Compatibility

• Chevrolet Silverado 1500 4.8L / 5.3L V8 1999–2007
• Chevrolet Silverado 2500HD / 3500HD 6.0L V8 2001–2007
• Chevrolet Tahoe 4.8L / 5.3L V8 2000–2006
• Chevrolet Suburban 1500 5.3L V8 2000–2006
• Chevrolet Suburban 2500 6.0L V8 2000–2006
• Chevrolet Avalanche 1500 5.3L V8 2002–2006
• Chevrolet Avalanche 2500 8.1L V8 2002–2006
• Chevrolet TrailBlazer 4.2L L6 / 5.3L V8 2002–2009
• Chevrolet SSR 5.3L / 6.0L V8 2003–2006
• Chevrolet Corvette 5.7L / 6.0L V8 1997–2004
• Chevrolet Camaro 5.7L V8 1998–2002
• GMC Sierra 1500 4.8L / 5.3L V8 1999–2007
• GMC Sierra 2500HD / 3500HD 6.0L V8 2001–2007
• GMC Yukon 4.8L / 5.3L V8 2000–2006
• GMC Yukon XL 1500 5.3L V8 2000–2006
• GMC Yukon XL 2500 6.0L V8 2000–2006
• GMC Envoy 4.2L L6 / 5.3L V8 2002–2009
• Cadillac Escalade 5.3L / 6.0L V8 2002–2006
• Cadillac Escalade ESV / EXT 6.0L V8 2002–2006
• Pontiac GTO 5.7L / 6.0L V8 2004–2006
• Buick Rainier 4.2L L6 / 5.3L V8 2004–2007
• Isuzu Ascender 4.2L L6 / 5.3L V8 2003–2008

Features

• Direct OEM replacement – no modifications needed
• Designed as an aftermarket replacement for compatible GM applications
• Compatible with GM LS-series 4.8L, 5.3L, 6.0L, and 6.2L V8 engines
• Also fits GM 4.2L inline-6 (Atlas engine) applications
• May help restore normal ignition performance when replacing a faulty coil
• A faulty ignition coil may contribute to misfires, rough idle, or hard starting
• Installation requirements vary by vehicle; professional installation is recommended if fitment or diagnosis is uncertain
• Popular upgrade for LS engine swaps

Cross-reference: 12578224, 12638824, 1208089, 1263115, 12589623, 12629646, 0997000850, 0997001900, 0997001730, 61000102, 4802236, 4805094, D585, UF262, UF-262, C1251

Frequently Asked Questions (FAQ)

Q: Will this ignition coil fit my GM truck or SUV?

A: Please check the Vehicle Compatibility list above. This coil covers a wide range of GM trucks and SUVs including Silverado, Sierra, Tahoe, Suburban, Yukon, Avalanche, TrailBlazer, Envoy, Escalade, and more with LS-series V8 engines (1999–2009). If you’re unsure, message us with your Year/Make/Model and we’ll confirm compatibility.

Q: What is the D585 ignition coil?

A: D585 is the Standard Motor Products (Blue Streak) aftermarket catalog number for this GM LS-series ignition coil. It has become the most widely recognized reference number for this coil in the US aftermarket. The GM OEM numbers are 12578224 and 12638824, with 12638824 being the latest updated revision.

Q: What is the difference between 12578224 and 12638824?

A: 12638824 is the updated GM OEM revision of 12578224. Both are direct replacements for each other and are fully interchangeable. 12638824 incorporates minor design improvements from GM but fits all the same applications.

Q: What are the Denso numbers 0997000850, 0997001900, and 0997001730?

A: These are Denso’s OEM cross-reference numbers for the same GM LS ignition coil. Denso is one of the original equipment suppliers for GM ignition systems, so these Denso numbers refer to the same coil as the GM OEM numbers.

Q: How many coils are included?

A: This listing includes four identical ignition coils. Most V8 engines use eight coils in total, one per cylinder, so two 4-piece sets may be required for a complete V8 replacement. Confirm the required quantity before ordering.

Q: Is this coil compatible with LS engine swaps?

A: Yes! The D585 / 12578224 coil is extremely popular for LS engine swap builds. This coil is commonly used in some LS-based applications and engine-swap projects, but compatibility depends on the ECU, wiring harness, connector, mounting arrangement, and calibration. Verify the build specifications before ordering.

Q: Is this an OEM part or aftermarket?

A: This is a high-quality OEM-equivalent replacement part manufactured to meet or exceed original GM factory specifications. The OEM part numbers listed are for reference and cross-compatibility purposes only.

Q: How do I know if my ignition coil is failing?

A: Common symptoms include engine misfires or rough idle, check engine light (CEL) with codes P0300–P0308, poor fuel economy, difficulty starting, and loss of power. We recommend scanning for fault codes before replacing.

Q: Is installation difficult?

A: Installation is straightforward and DIY-friendly. You typically need a 7mm socket and extension bar. The process takes about 30–45 minutes for a V8. No special tools or programming required.