GM GENUINE PARTS Variable Valve Timing (VVT) Solenoid 12636175 — Direct-Fit OEM-Calibrated, Corrosion-Resistant

GM Genuine Parts 12636175 is a factory-validated variable valve timing (VVT) solenoid that controls oil flow to cam phasers so your GM engine can change camshaft timing accurately under varying speed and load.

Designed, engineered and tested to General Motors standards, this VVT solenoid replaces the original equipment part on compatible Chevrolet, Buick, GMC and Cadillac engines. It helps the engine reach intended camshaft positions that are calibrated for driveability and efficiency. Built with protective coatings and OEM-calibrated operation, the 12636175 arrives ready to integrate with the vehicles timing system without reprogramming or modification.

How does this solenoid affect engine timing and performance?

The 12636175 routes engine oil to the cam phaser so the camshafts can advance or retard timing according to engine speed and load. Proper operation helps maintain the timing positions the engine control strategy expects, supporting consistent idle quality and throttle response. Its not a tuning device but a direct replacement for OE functionality.

• Direct-fit part engineered to match OEM calibration and flow characteristics
• Regulates oil flow to phasers for accurate camshaft timing
• Helps preserve factory driveability and emissions behavior

What makes this GM Genuine Parts solenoid different from aftermarket options?

GM Genuine Parts are designed and validated by GM engineers for specific vehicle models, so dimensions, connector pins and hydraulic behavior match the original. Materials and coatings are selected to resist common failure modes like corrosion and contamination. That reduces the risk of fitment issues and unexpected behavior that can arise with generic replacements.

• Manufactured to GMs specifications and validated on GM vehicles
• Protective coating reduces premature corrosion and wear
• Updated designs and materials tracked by GM for consistent quality

How do I know when to replace the VVT solenoid?

Symptoms that suggest replacement include inconsistent idle, a check engine light with camshaft/ timing codes, or noisy phaser operation. Because the solenoid controls oil flow, contamination or electrical faults can degrade function. Diagnostics should confirm the solenoid is the root cause before replacing.

• Watch for engine codes related to camshaft timing or variable valve control
• Listen for erratic idle or unusual timing-related noise from the front of the engine
• Inspect for oil contamination or connector damage when troubleshooting

Is installation straightforward and will it require reprogramming?

Replacement is typically a direct swap that uses the factory mounting points and electrical connector; no tuning or ECU reprogramming is generally required. Basic mechanical skill and standard tools are enough, though access may be limited on some engines. Always follow vehicle-specific service procedures and torque specifications.

• Designed as a plug-and-play OE-type replacement for compatible GM models
• No calibration changes needed when installed correctly
• Follow GM service manual steps for safe removal and installation

Who is this for: This GM Genuine Parts 12636175 VVT solenoid is for owners and technicians who want an OE-grade replacement part for Chevrolet, Buick, GMC or Cadillac engines that use variable valve timing. Choose it when you need factory-matching fit, validated performance, and corrosion-resistant construction to restore intended camshaft timing behavior without aftermarket guesswork.