HY-SPEED Camshaft Position Actuator Solenoid (VVT) — Single OE-Style Replacement for 2002–2012 GM Vehicles, Engine-Mounted

HY-SPEED Camshaft Position Actuator Solenoid (VVT valve) is a direct-replacement variable timing solenoid designed to restore proper cam phasing in affected GM and related engines from 2002–2012.

This OE-referenced replacement part from HY-SPEED fits a wide range of mid-2000s GM and GM-related vehicles — including Colorado, Trailblazer, Envoy, Canyon, Rainier, Hummer H3/H3T, Isuzu Ascender/i-series, Oldsmobile Bravada and Saab 9-7x — and is supplied as a single brand-new camshaft position actuator solenoid ready for installation in the cylinder head. It carries multiple equivalent OE numbers, and comes with a 12-month warranty and a no-reason return policy for added confidence when repairing variable valve timing systems.

What does this camshaft position actuator solenoid replace?

This HY-SPEED unit replaces the factory variable timing solenoid (VVT valve) that controls oil flow to the camshaft actuator. It's compatible with many OE part numbers, so it can swap into systems originally fitted with those referenced items.

• Direct-replacement for OE#s like 12615873, 12602516, 12597025 and others
• Engine-mounted solenoid that controls cam phasing via oil pressure
• Sold as a single solenoid for installation in the cylinder head

Which vehicles and engines will this HY-SPEED VVT solenoid fit?

Fitment covers a broad set of GM-family and related platforms produced between 2002 and 2012. Check the listed model years and engine displacements to confirm compatibility before purchase.

• Chevy/GMC: Colorado, Canyon, Trailblazer, Rainier, Envoy (various 2.8L–4.2L and 3.5L–3.7L engines)
• Hummer H3/H3T and Isuzu Ascender/i-280/i-290/i-350/i-370 models included
• Also fits Oldsmobile Bravada and Saab 9-7x 4.2L applications

How does installing a new VVT solenoid help my engine?

Replacing a worn or clogged solenoid restores correct oil control to the cam phaser, improving cam timing control and reducing symptoms tied to VVT malfunction. This can address rough idle, timing-related codes, and inconsistent engine response when the solenoid is the cause.

• Restores oil flow control to the camshaft actuator
• Can stop or prevent VVT-related diagnostic trouble codes
• Improves timing consistency and engine drivability when solenoid-related

What should I know before buying and fitting this part?

Confirm your vehicle year, engine displacement and OE part number match one of the listed fitments. The part installs in the cylinder head; basic mechanical skills and standard tools are typically sufficient for replacement, but inspect the connector and harness for damage.

• Verify fit with OE numbers: 12568078, 12576768, 12602516, 12615873, etc.
• Sold as solenoid only — no actuator or cam phaser included
• 12-month warranty and returns included for peace of mind

Who is this for: Professional mechanics and DIY technicians who need a cost-effective, OE-referenced replacement VVT solenoid for mid-2000s GM-family and related vehicles. It’s intended for anyone diagnosing cam phaser or variable timing oil control problems who wants a direct-fit, warrantied alternative to dealer parts.