GM GENUINE PARTS VVT Solenoid Assembly 12679100 with Seal Retainer Bolt — OE Fit, Corrosion-Resistant

GM Genuine Parts 12679100 is an OE-style variable valve timing (VVT) solenoid assembly that controls oil flow to cam phasers to restore proper camshaft timing and engine response.

This solenoid kit from GM Genuine Parts includes the VVT solenoid, seal, retainer, and bolt and is engineered and validated by General Motors to match factory specifications. Designed for direct replacement on compatible Chevrolet, Buick, GMC, and Cadillac engines, the unit helps the vehicle maintain calibrated camshaft positions that vary with engine speed and load for consistent drive quality. The component is coated to resist premature corrosion and built to the same standards used in original production or validated service parts.

How does this VVT solenoid affect engine performance?

The solenoid modulates oil pressure to cam phasers so the engine can advance or retard camshaft timing as conditions change. Proper timing helps the engine maintain smooth power delivery and throttle response across RPM ranges, because the camshafts are positioned according to the vehicle’s control strategy rather than left static.

• Regulates oil flow to cam phasers for correct valve timing
• Helps restore designed engine response and acceleration behavior
• OEM-calibrated to match factory timing characteristics

Will this part fit my GM vehicle and is it a direct replacement?

GM Genuine Parts are developed by GM engineers and validated to fit the intended vehicles; 12679100 is intended for specific GM engine applications. Always verify part compatibility with your vehicle year, make, model, engine code, or VIN before ordering to ensure a direct fit.

• Designed to OEM dimensions and calibration
• Includes seal, retainer, and bolt for complete installation
• Check vehicle compatibility via VIN or parts catalog to confirm fit

What are the durability and protection features of this assembly?

The solenoid carries protective coatings and passes GM validation tests to resist corrosion and wear that can shorten service life. Using a GM Genuine Part helps maintain the original engineering tolerances that contribute to reliable operation under normal driving conditions.

• Corrosion-resistant coating to reduce premature failure risk
• Validated by GM for material and performance standards
• Updated designs reflect production improvements and materials

How straightforward is installation and what comes in the kit?

The kit is supplied with the solenoid plus the matched seal, retainer, and mounting bolt to simplify replacement and reduce the need for extra parts. Installation is typically performed at the timing control area or cam phaser access location on the engine; basic mechanical experience or professional service is recommended for correct torque and routing.

• Complete kit: solenoid, seal, retainer, and bolt included
• Direct-replacement design minimizes modification or additional parts
• Follow OEM torque specs and installation sequence for reliable seal

Who is this for? The GM Genuine Parts 12679100 VVT solenoid assembly is aimed at owners and technicians maintaining Chevrolet, Buick, GMC, or Cadillac engines that use an electronically controlled variable valve timing system. It suits DIY mechanics who need an OE-quality replacement and professional shops that require factory-validated parts for reliable repairs. If your vehicle shows timing-related codes, rough idle, or reduced responsiveness and a compatible VVT solenoid has been identified as the serviceable item, this GM Genuine Parts kit is a factory-matching option to restore correct cam phaser function.